MUSEUM OF COMPARATIVE ZOOLOGY. 131 



Habitat. U. S. Fish Commission Station 2607, off the Carolina coast, in 18 

 fms., sand, temperature 73°. 5; and Station 2373, in the Gulf of Mexico, in 25 

 fms., coral, between the delta of the Mississippi and Cedar Keys, Florida. 



This little species belongs to the same general group as C. minima Reeve, 

 C. Smithii Dall, and C. subangulata Scacchi, but differs by good characters from 

 them all. It has one more columellar fold than C. Smilhii, which has fewer 

 and corded varices and' no carina on the shoulder of the whorl. Its nearest 

 relative is the Miocene C. scalarina Conrad (non Deshayes) which is less 

 turrited and has a different pillar. 



Cancellaria (Trigonostoma?) microscopica n. s. 



Shell minute, five-whorled ; upper whorls gray, the last whitish; nucleus 

 inflated, glassy, polished, remaining whorls shouldered near the suture ; last 

 whorl spirally sculptured with subequal rather coarse threads (which on the 

 preceding whorls alternate large and small) crossed by evident little elevated 

 lines of growth ; the earlier whorls are crossed by small rounded riblets, most 

 evident at the shoulder, which become obsolete on the last whorl ; umbilicus 

 distinct, moderate, with no bounding carina or siphonal fasciole ; aperture 

 rounded behind and hardly angular in front, the outer lip faintly Urate within, 

 not thickened - , the inner lip moderately callous with one (or more?) extremely 

 faint folds about the middle ; epidermis hispid, thin, yellowish. Max. Ion. of 

 shell, 4.3 ; of last whorl, 3.3 ; of aperture, 2.0 ; max. lat. of shell, 2.0 mm. 



Habitat. Campeche Bank, off Yucatan, in 200 fms., and off Cuba, in 780 

 fms., mud, Dr. W. H. Rush, U. S. N. Station 2668, off Fernandina, Florida, 

 in 294 fms., sand, U. S. Fish Commission. 



This is probably the smallest species known, and, notwithstanding the faint- 

 ness of the folds, which may be an incident of its stage of growth, it has the 

 aspect of a Cancellaria rather than an Admete. Its nearest ally is perhaps 

 C. minima, which has a different sculpture, no umbilicus, and is about twice 

 as large. C. subangulosa S. Wood, an Eocene fossil, now living in the waters 

 of Madeira and the Canary Islands, is more elongated in the spire and has a 

 proportionally smaller body whorl ; it is strongly ribbed, red brown in color, 

 and has a well-marked siphonal fasciole. It is but little larger than the present 

 species. None of the Italian Tertiary forms appear closely related to the present 

 species. Admete nodosa Verrill is totally different, and perhaps not even an Ad- 

 mete; and the northern species need not be compared with C. microscopica. 



Of species erroneously referred to this region are the West American C. bre~ 

 vis, corrugata, and tessellata ; C. scalarina Reeve, or Thomasiana Crosse, is 

 Chinese, and C. Candcana Orbigny is a young Phos. 



Genus BENTHOBIA Dall. 



Shell 6mooth, short-spired, resembling Admete, or an imperforate smooth 

 Trichotropis, with a broad concave columella destitute of plaits, shorter than 



