INSTITUTE OF SCIENCE, PHILADELPHIA. 1 35 



Nassa ; B. sagcna Conrad is a Plios. Phos texanns appears to be a Nassa 

 and not a Phos. 



Ti'itiqmississippiensis Conrad, from the Vicksburg, is a Plios, and so is Nassa 

 cancellata Lea from the Claiborne sands, which is the same species as B. sage- 

 «?/;« Conrad. A species closely alh'ed to Ilyanassa (7(5i'tf/^/«, if not, perhaps, 

 identical, is found in the Miocene of Wilmington, North Carolina. 



Family COLUMBELLID^. 

 Genus OOLUMBELLA Lamarck. 

 Columbella rustiooides Heilprin. 

 C. riisticoides Heilprin, Trans. Wagner Inst. i. p. Si, pi. 8, fig. 9*, 18S7. 



Pliocene of the Caloosahatchie. Recent on the west coast of Florida, the 

 Keys and Cuba. 



This species is identical with the shell which has commonly been called 

 Columbella rustica by American collectors, but which is hardly to be united 

 specifically with the genuine C. rustica of the Mediterranean, though related 

 to it. It is, therefore, to the American and not, as Prof. Heilprin supposed, the 

 European species that the fossil is most nearly related. 



The typical Columbellas, so far, are not known in America from strata 

 earlier than the Pliocene. C. mercatoria L. is known from the Post-Pliocene 

 of Costa Rica and Santo Domingo, and in the recent state extends northward 

 to the Carolinas. 



Subgenus Anachis Adams. 



This is a much older group, if we may judge by American evidence, than 

 the typical Columbella. With Astyris it extends to Mid-Eocene. Dentiterebra 

 prima O. Meyer,* of which I have examined the type-specimen, is merely a 

 small, rather elongated A?iachis, and has no claims to separate generic distinc- 

 tion. It would fall in the section Seminella Pease. It dates from the Clai- 

 borne sands. 



Strombina exilis Gabb (1873), from the Santo Domingo Miocene, is an 

 Anachis and not a Strombina. I have examined the type-specimen. 



The Pliocene has an abundance of species, several of which are found in 

 the Caloosahatchie marls. 



Anactiis avara Say. 

 Anachis avara Say, Dall, Mar. Moll. S. E. Coast U. S., p. 116, pi. 50, fig. 12, 1889. 



Recent and Post-Pliocene from Massachusetts Bay to the Florida Keys. 



Anachis avara var. caloosaensis Dall. 

 Pliocene of the Caloosahatchie and Shell Creek, Florida. 

 This form differs from the recent var. avara s. s. in having the suture 

 appressed above the ends of the ribs so as to give it a somewhat marginated 



* Proc. Acad. Nat. Sci. 1S87, p. 52, pi. Hi. fig. 2. 



