300 < YLICHNA. 



almost perfectly horizontal, so that the whole top of the body-whorl 

 and the upper corner of the mouth are on the same level ; in the 

 center is a minute closed pore. Inner lip; there is a thin narrow 

 glaze which thickens and expands in front : it is not expanded on 

 the top. Pillar is short, slightly oblique and twisted, with a strong- 

 ish defined tooth, in front of which it is rather abruptly truncate. 

 Alt. 0'156 in. ; diam. 0'066. Mouth, breadth at same place, 0'014 

 inch. (^ Wilts.). 



North of Culebra LIwL \Vc.<t /W/V*, 390 fms. 



Cylichna dw-n.< NV.vis., Challenger Gastr., p. 664, pi. 49, f. 10. 



jtrotracta (Gould) is very like this in front, but rises 

 much higher above. Cylichna cyJ'uulracea (Pennant), is slightly 

 slimmer or narrower in proportion to length, has the body-whorl a 

 little smaller, and the mouth slightly broader, lacks the slight poste- 

 rior narrowing, and is squarely truncate behind, while here the shell 

 is rounded. The Challenger species, too, quite wants the very 

 peculiar form of the upper corner of the mouth which is character- 

 istic of Cyficliu" cylindracea. Cylichna llxt (Brown), of the same 

 size, is rounder and less cylindrical, being more attenuated above 

 especially ; the mouth is extended above the top of the shell ; the 

 t<>p of the body-whorl is more oblique and less truncated. (Wats.). 



('. Ari:i-:ui Orbigny. PI. 41, figs. 21, 22. 



Shell ovate cylindrical, obliquely truncated at the ends, thin, 

 pellucid, white, smooth, delicately spirally striated l>el<>\v; spire im- 

 mersed, replaced by an i in perforate depression; aperture narn>\\, 

 straight, dilated below. Alt. 3, diam. 2 mill. (Orb.). 



Cuba. 



Bulla auberii ORB., Moll. Cuba i, p. 127, pi. 4 bis, f. 5-8. 

 Cylichn'i ,n,l,.;'i D.xi.L, Blake Rep., p. 55 ; Cat. Mar. Moll. S.-E U. 



a, P. 84. 



( . KKIIXI M'.rch. Unfigured. 



Shrll short, cylindrical, regularly spirally striated, the growl h- 

 ir< II developed. Lip a little produced above. Spire impcr- 

 fce, covered by a thin callus ; columella strongly angulate, a> in 

 '/tea succinea Couth. Alt. 8, diam. 4 mill. < .!/<//'// . 



St. Bart*; St. Mrtin.<: Atiyni/la (Krebs). 



