302 CYLICHNA. 



an Atys. Something without colour between Cylichna marmorata 

 A. Adams, and Cylichna bizona A. Adams, would be very near. 

 Cylichna luticola, C. B. Adams, is much more cylindrical. 



Species of the West coast of the Americas. 



0. LUTICOLA C. B. Adams. Unfigured. 



Shell subcylindric, wider anteriorly ; pale horn color, subtrans- 

 parent; with the striae of growth very minute; apex in a deep nar- 

 row umbilicus, which is partly covered by the upper part of the 

 labrum ; last whorl compressed around the middle ; aperture rising 

 higher than the umbilicus, linear above, suborbicular below ; labrum 

 very thin, much advanced along the middle ; columella thickened 

 with a callus ; anterior umbilical region indented, partly covered 

 with a deposit. Length '2 inch. ; breadth -095 inch. (Ad.). 



Panama (Adams) ; Mazatlan (Cpr.). 



Bulla (Cylichna} luticola C. B. AD., Pan. Cat, p. 215, 319. 

 Haminea luticola ADS., Gen. Rec. Moll, ii, p. 16. Cylichna luticola 

 CPR., Maz. Cat., p. 170 ; Moll. Western N. A., p. 34, 194; Brit. 

 Asso.Rep.for 1856, p. 250, 275, 313. 



Carpenter suggests that the following species may be the young of 

 this. 



Station : This species was found crawling on liquid mud, near low 

 water mark, at the bottom of a steep sand beach. 



C. CARPENTERI Hanley. Unfigured. 



Shell minute, cylindrical, short, subretuse in the middle, white, 

 slightly attenuated above and below, sculptured all over with slender 

 close longitudinal, and closer very fine spiral lirse; apical umbilicus 

 large, showing the whorls of the spire ; outer lip rounded through- 

 out, projecting above the apex behind, retuse in the middle ; col- 

 umella straight, long, narrow. Alt. one-thirteenth of an inch. 

 (Hanley). 



Mazatlan (Mus. Hanley). 



Bulla ( Cylichna) carpenteri HANLEY, P. Z. S. 1858, p. 543. 

 Conf. CPR., Moll. W. N. A., p. 34. 



C. PLANATA Carpenter. Unfigured. 



Shell small, cylindrical, subelongate, white, smooth, covered with 

 a straw-colored epidermis ; margins nearly parallel ; spire flat, hardly 



