Trocholites

Conr.

Gyroeeras . . .

Konck.

EL

Phragmoceras

. Iîrod.

Cyrtoceras . .

Goldf.

G. Gomphoceras

. Sow.

fi-

Oncoceras .

Hall.

Orthoceras .

. Breyn.

L Phragmoceras .

Brod.

Cameroceras

. Emm.

Gomphoceras .

Sow.

Coleoccrns .

. Portl.

Poterioceras .

Fisch.

iq.

Conotulmlaria Troost.

Orthoceras . .

Breyn.

Ormoceras .

. Stok.

Actinoceras .

Bronn.

Actinoceras

. Bronn.

Coleoceras . .

Portl.