MUSEUM OF COMPARATIVE ZOOLOGY. 97 



Drillia Moseri n. s. 



Plate XXXVI. Fig 3. 



Shell varying from a rich rose color, with j):iler bands on the base, fasciole, 

 etc., to yellowish white ; nucleus as usual in Drillia with two whorls followed 

 by nine or ten subsequent whorls ; spiral sculpture of numerous very shallow 

 grooves with wider flat interspaces ; the grooves are cross-striated by close-set 

 fine elevated incremental lines ; this sculpture is very easily eroded and son,ie- 

 times nearly absent ; transverse sculpture of about eleven strong wave-like ribs 

 with wider interspaces, the crests rounded ; these extend from the suture to the 

 base, and are narrowed and curved like the top of an interrogation point 

 when they pass over the fasciole ; the fasciole is constricted rather than exca- 

 vated, the grooving is closer and finer than on the rest of the shell, and if the 

 shell is colored the fasciole is paler; the whorl is strongly appressed at the 

 suture and a little undulated by the ribs ; the aperture is rather narrow ; 

 the notch large and rounded ; the callus thick and elevated, the pillar nearly 

 straight; the canal short, wide, turned to the right, the siphonal fasciole strong ; 

 the varix large and stout. Max. Ion. of shell, 30.0 ; of last whorl, 15.5 ; of 

 aperture, 11.0 ; max. lat. of shell, 10.0 mm. 



Habitat. West of Florida, in 15 fms.; St. Martin's Reef, South Florida, in 

 3 fms., Lieut. J. F. Moser, U. S. N. ; Sarasota Bay, one specimen, H. Hemp- 

 hill ; U. S. Fish Commission Station 2596, 17 miles E. S. E. of Cape Hatteras, 

 N. C, in 49 fms., sand, temperature 75° F. 



This shell, when pink, is one of the prettiest of the small shells on our 

 southeastern coast. It is respectfully dedicated to Lieut. Moser, whose collec- 

 tions while engaged on surveys in Florida often contributed material of much 

 interest for the study of the Floridian marine fauna. 



Genus BORSONIA Bellardi. 



Borsonia Bellardi, Bull. Soc. Geol. de France, X. p. 30, 1838. Mon. Pleurotome del 

 Piemonte, p. 83, tav. iv. fig. 13 {B. prima Bell), 1847. 



Shell pleurotomoid, with a single plication of the columella near the middle 

 of the inner lip. 



Subgenus BORSONIA s. s. 



Borsonia ceroplasta and B. sericea Watson, the former from 390 fms., mud, 

 near Culebra Island, and the other from off Pernambuco, in 350 fms., red 

 mud, belong to the typical section of the genus. 



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