244 CERION, GROUP IX. 



C. PILLSBURYI Pilsbry and Vanatta. PI. 36, figs. 41, 42. 



Shell tapering sub-cylindrical, the later three whorls of nearly equal 

 diameter, those above forming a rather long cone, which passes very 

 gradually into the sub-cylindrical portion ; apex very obtuse. Whorls 

 10 to 10^, the nepionic smooth, next whorl sharply finely striate or 

 smoothish ; succeeding whorls flat and smooth with some growth- 

 lines only; last one-half to two whorls regularly costulate, riblets 

 narrower than the intervals, about one millimeter apart. Base 

 rounded, not compressed ; umbilical chink very short, imperforate. 

 White with irregular, interrupted, brown or gray-brown streaks. 



Aperture vertical ; parietal tooth very small, weak and short ; 

 columellar fold distinct, extending inward one whorl. Peristome 

 well reflexed, whitish, rather thin or thickened ; parietal callus mod- 

 erate or very thin. 



Alt. 29, diam. of last whorl above aperture 1112 ; longest axis of 

 aperture 11^ mill. 



Alt. 27^, diam. of last whorl above aperture 11 ; longest axis of 

 aperture 11 mill. 



Bahamas: Gun Cay, on the western edge of the Andros bank. 

 (Dr. Wm. H. Rush.) 



C.piUsburyi P. & V., P. A. N. S., 1897, p. 366, f. 5. PILSBKY, 

 Nautilus xii, p. 26, 27 r f. 5. Cerion paimosum Mayn., DALL, Bull. 

 Mus. Comp. Zool. xxv, no. 9, p. 119. Not of Maynard. 



The rather long and gradually tapering cone, smooth surface above, 

 the last one or two whorls ribbed, and the very small parietal tooth, 

 are the most prominent features of this species. It is closely related 

 to C. gubernatorium and C. ekutliera* both of which have the parietal 

 tooth decidedly larger and the interior darker. Its superficial re- 

 semblance to C. regina eucosmium is remarkable ; but the small area 

 behind the columellar lip, with short umbilical chink and rounded 

 base, distinguishes it at once from that form. It is superficially not 

 unlike some of the Cayman Is. species, but has not the strong and 

 long parietal tooth of those forms. This species is named in honor 

 of Lieutenant-Commander John Elliott Pillsbury, of the U. S. Coast 

 Survey Steamer " Blake." 



C. NITELOIDES Dall. PI. 36, fig. 43. 



Shell compact, solid, grayish white, with a livid brownish lining; 

 ten \\liorls of which two and a half are nepionic and smooth, tl e re 



