WASHINGTON

Nmt: he lmn. Deier bedr Kuna, à (M4, f 60.

Review of Hall & Whitney's Geology of Iowa.

The true generic charactersof Zeacrinus, Agaricocrinus and Agassizocrinus of Toost,- genera which that author had given in his catalogue, but of which he had never published the full descriptions - are here for the first time given. In this and other cases, Mr. Hall has evidently aimed to recognize fully the unpublished labors of Prof. Toost. He has on page 544 the following note;-

" I have transcribed these observations, as well as the specific description of this species from the MS, of

Dr. Troost's memoir upon the Crinoideás, which is to be

published in the Smithsonian Contributions to Knowledge;

having been permitted to make such references and cita- ۱ of the tions as would enable me to verify any, genera and spe- : 4 TD : : UN a cies which I might describe in the Iowa Report. By this means, although Dr. Troost's paper has not yet been

published, he has the precedence which belongs to him."

Am. Journ. Sci., Vol. XXVII, 1959, p. 114,