V.. Nes 5g et

U. purpureus, Say, Barn.,

U. coarctata, Lam.

(d'après son exempl.).

U. purpurascens, 1d. id.

U. rhombula , id. id.

U. carinifera , id. id.

U. georgina, id. id.

U. sulcidens, id. id.

U. glabrata, id. id.

U. rarisulcata? id. id.

U. fluviatilis, Green ?

U. aurata, Raf. (d’après

Conrad ).

congaræus, Lea.

augustatus, Lea.

subtentus, Say.

Carolinianus, Bosc.

obesus, Lea.

camptodon, Say.

(an Carolinianus ? ) heterodon, Lea.

Iris, Lea (13).

(subrostratus, selon Say.) Calceolus , Lea (14).

(Ælasm.marginata,selonSay.

truncata Say , selon Conr.) purpuratus, Lam.

U. ventricosa, Soland.

U. lugubris, Say.

U. ater, Lea.

fasciolus, Raf. (son ex.) (15).

subovatus, Lea. (id.)

(Cardium, var., selon Say et

Conrad).

jun. multiradiatus, Lea, Con-

rad.

(fasciolus, Raf., selon Say.) ovatus, Say, Lam., Raf., Barn. :

ochraceus, Say, Conrad (16).

Symphyn. ochracea, Lea.

ventricosus, Barn. (15).

U. Cardium, Say, Conrad.

Cardium, Raf., Say (18).

ventricosus, Var, Barn.

Occidens, Lea.

ovatus, var., b, Lam.

capax, Green, Conrad (19).

(Cardium, var., selon Say.) cariosus, $'ay,Lam.,Barn. (20).

luteola, Lam. (d’après son

exempl. ).

ovatus, Valenc.

* viridis, Raf. (21).

(cariosus, selon Say.).

siliquoideus, Barn. (22).

(cariosus, selon Say.) (inflatus , selon Conrad.) U.. rigida, Wood ?

* a) inflatus, Barn.?

fasciatus, Aaf: Say.

* carinatus, Barn (selon Say et Conrad) (23).

radiatus, Spengl., Gmel.,Lam., U.oblongata, Wood, Suppl.

U. l’irginiana, Lam.

teres, ARaf. anodontoïdes , Lea.

rectus, Lam., Valence.

latissima, Raf.

proelongus, Barn.

Mya prælonga, Wood.

crassus, Say, Raf. (24).

(cariosus, Say, selon Conrad.) crassidens, var. ©, Lam.

ellipticus, Barn. ( cariosus, Say, selon Conrad.) carinatus, Barn.

Mya gravis, Wood, Suppl.

ligamentina, Zam. (25).

ellipsaria, Raf.(crassus, selon Say; lineolatus, selon Conr.) verrucosus, Raf., Say.

tuberculatus, Barn.

quadrulus , Raf.

rugosus, Barn.

asperrünus, Lea.

lacrymosus, Lea (26).

(quadrulus, Say, Conrad).

trapezoïdes, Lea. .

crassidens, var. a, Lam.

interruptus, Say.

Heros , Say.

multiplicatus, Lea.

undulatus , Say.

plicatus, Say, Barn., Hildr.

Peruviana, Lam. (d'aprés son exempl.; costatus ? selon Say.) rariplicata, Lam, Dombeiana, Valence. (25).

crassus, Barn.

costatus, Æaf.

. Nes 59 et Go. 27

undulatus , Barn.

undulatus , Valenc.

apiculatus, $'ay. (28).

asper, Lea (sp. dist ? Conr.

metanevrus, Æaf.

nouosus, Barn.

cylindricus , Say.

naviformis, Lam., Valenc.

solenoïdes, Raf.

dilatatus, af.

nasutus, Lam.

gibbosus , Barn. { atro-violacea, Raf. (d’après

Conrad).

jun. cuprea, Raf., (id.) a) mucronatus, Barn.

flavus, Raf.

rubiginosus, Lea.

fasciolaris, Raf. (29).

phaseolus, Hildr., Say.

mucronatus , Barn.

planulatus , Lea.

*“ sinuatus,Raf.? (selon Conrad).

* bicolor, id. ? (id.)

niger, Raf., Say (30).

crassidens , var. b, Lam.

cuneatus , Barn.

Bariosta ponderosa, Rafin.

(d’après l’exempl. env. par fui.)

Venus, Aaf.

fabalis, Lea.

lapillus , Say.

nervosus, {af.

zig-zag, Lea.

donaciformis, Lea P (31).

(nervosus, selon Say).

(truncatus, selon Conrad).

truncatus, Aaf.

elegans, Lea.

triqueter, Raf.

triangularis , Barn.

cunealus, Swainson.

Jormosus, Lea.

foliatus, //ildr.

Cyphia, Raf.

/Æ'sopus, Green.

gibbosus ,* Raf.

perplexzus, Lea. ÆT#1

a) ÆEpioblasma biloba, Rafinesque P (32).

GÉPAMEMNCS

torulosus, taf.

(gibbosus selon Conrad.' reflexus, ARaf.

cornutus, Barn.

pachostea. Raf. (33). (triangularis selon Conrad).

Cooperianus, Lea.

tuberculatus, Aaf.

verrucosus, Barn.

verrucosus purpureus, Hildr.

tuberculosa, Nalenc.

verrucosus, //al.

2errucosus, var. Barn.

verrucosus albus, Hildr.

bullatus, Aaf.

plumbeus, /Vob.(34).

Chama plumbea, Chemn.

U. nodulosus, Wood.

pustulosus, £ea.

(bullatus, Say, Conrad.

nodulatus, ARaf.

pustulatus, Lea.

Stegarius, Aaf.

trroratus, Lea.

retusa, Lam.

torsus, Raf.

subrotundus, Raf.

rotunda, Wood.

Circulus , Lea.

orbiculatus, Hildr.

* pusilla, Raf. (selon Conrad).

* striata, Raf. (id.) lævigatus, Raf.

castaneus, Lea.

(lævigatus ? selon Say).

politus , Say. (35).

subrotundus , Lea. (personatus , selon Conrad).

personatus , Say.

Cyclips, ARaf.

abruptus , Say.

Calendis , Raf. (sel. Conrad.) obliquatus , Raf. (36).

monstr. U. {laysianus, Lea.

a) U. sulcatus, Lea.

monstr. U. ridibundus, Say.

olivarius, Raf., Conrad (35). ellipsis , Lea. (triangularis, Raf., sel. Say.) triangularis, Aaf. (38).

cicatricosus , Say.

59 et 60.

(Cyphia,Raf., selon Conrad.)

varicosus , Lea. (id.) obliqua, Lam.

obovalis, Raf.

ebenus, Lam.

Mya obliqua, Wood ?

lineolatus, Raf.

depressus, Raf.

Securis, Lea.

interruptus, Raf.

brevidens, Lea.

nexus, 14ay.

arcæformis, Lea.

undatus, Barn.

uigonus, Lea.

decisus, Lea.

(S'calenius? var. selon Say.) cuneatus, Raf.

(Scalenius, selon Conrad.)

patulus, Lea,

(S'calenius, selon Conrad.) lateralis, af.

(triangularis, selon Conrad.)

crassus, Var. ©. Barn.

sintoxia, Raf.

(criangularis, sélon Conrad.) mytiloides, Raf.

(criangularis , selon Conrad.)

caridiacea, Say of Guérin.

pyramidatus, Lea.

(triangularis, selon Conrad.)

rubra, Raf.

(triangularis,, selon Conrad.) Clava, Lam. (39).

S'calenia, Raf.

modioliformis , Say.

* retusus, Raf., Conrad.

* stapes, Lea. Conrad.

kKK FX à

(retusus ? Say.) flexuosus, Raf., Conrad.

pileus, Lea, Conrad.

(flexuosus, Say?) acutissimus, Lea.

Velum, Say:.

elliptica, Raf.

zonalis, id. montanus, id.

(Contin. of a Monogr.

rimosus, id. id.

fulvus, id. id.

roseus, id. (Aonogr.)