INSTITUTE OF SCIENCE, PHILADELPHIA. 269 



chie, Dall ; living along the coast of North America from Cape Cod to Yuca- 

 tan, and in the Antilles to Grenada, in 2 to 15 fathoms. 



This very elegant species is readilj' recognized, and seems to be rarer in 

 the fossil than in the recent state. 



Subgenus Cerithiopsis s. s. 

 It may be noted that the figure of the operculum of this genus in Forbes 

 and Hanley's British Mollusca, and which is copied by H. and A. Adams in 

 the Genera of Recent Mollusca, is erroneous. For a correct figure see Jef- 

 freys' British Conchology, vol. iv., pi. iv. fig. 5. 



Cerithiopsis tubercularis Montagu var. floridana Dall. 



Pliocene of the Caloosahatchie beds; living on the coast of Florida at 

 Key West, Hemphill. 



This form differs from the British C. Iiiberadaris in being more inflated 

 and having the axial sculpture closer and more prominent than the spiral 

 ridges. The recent specimens referred to it differ also in color, having the 

 sutural region dark purplish brown and the peripheral nodules nearly white, 

 while the rest of the shell is the usual dark yellowish brown. It is possible this 

 shell should be referred rather to C. Greenii than C. tubercularis, yet it seems 

 intermediate between them. CcritJiiiivi Lordlyi Gabb, from the Pliocene of 

 Costa Rica, may probably prove to be a variety of tubercularis. 



Cerithiopsis Greenii C. B. Adams. 



Cerithium Greenii Q. B. Ads., Bost. Journ. N. Hist. ii. p. 287, pi. iv. fig. 12, 1839; Stimp- 



son, Sh. N. Engl., p. 37, 1851. 

 Bittium Gree^iiiW. and A. Adams, Genera Rec. Moll. i. p. 2S7, 1854. 

 Cerithiopsis Greenii Dall, Blake, Gastr., p. 251, 1889 ; Bull. U. S. Nat. Mus. No. 37, p. 138, 



pi. 52, fig. 2, 1889. 



Pliocene of the Caloosahatchie River, Florida, Dall ; Post-Pliocene of 

 Sankoty Head, Nantucket, Verrill ; living from Prince Edward's Island on the 

 north to Santo Domingo on the south, and west to San Antonio Bay, Texas ; 

 also at Bermuda. 



This species appears sufficiently well distinguished from the C. tubercu- 

 laris both in shell and animal. 



Cerithiopsis scariphus n. s. 

 Plate 22, figure 5. 

 Pliocene of the Caloosahatchie beds, rare; Dall. 



Shell small, subcylindrical, slender, with a smooth styloid nucleus of about 

 four whorls and eight or nine subsequent whorls ; sculpture of a posterior 

 smaller, two peripheral larger and one smaller basal revolving ridges, upon the 

 last of which the suture is wound, reticulated by numerous finer, slightly more 

 crowded, sharp, axially directed, elevated lines, and slightly nodulous at the 



