COELOCENTRUM, SECT. LIOCENTRUM. 47 



The exact affinities of C. championi and clathratum remain 

 to be determined. 



C. CROSSEANUM (Pfeiffer) . PI. 17, figs. 26, 27, 28, 29. 



Shell deeply rimate, cylindric, tapering above, rather solid, 

 chestnut colored. Surface glossy, sculptured with arcuate 

 riblets, about 5 in the space of 2 mm. on the antepenultimate 

 whorl, somewhat closer on the penult, and becoming crowded 

 011 the latter part of the last whorl, the intervals much wider 

 than the ribs, and sculptured with coarse, obliquely spiral, 

 descending striae. Whorls remaining 10 to lO 1 /^ convex, the 

 last free in front, rounded basally, the base bounded by a low. 

 cord-like keel. Aperture oblique, rounded-oval, livid fleshy 

 or violaceous within ; peristome continuous, whitish, narrowly 

 expanded. 



Internal column smooth and glossy, very slightly swollen 

 below the middle within each whorl. 



Length 29.2, diam. 9 mm. ; longest axis of apert. 6.2, width 

 5.5 mm. 



Length 29. diam. 9.5 mm. ; longest axis of apert. 7, width 

 6 min. 



State of Vera Cruz, E. Mexico: Orizaba (Botteri) ; Cuaut- 

 latitlan, between Jico and Perote, N. of Orizaba (Dona Este- 

 fania Salas). 



Cylindrella crosseana PFR., Journ. de Conchyl. xv, 1867, p. 

 4",1 ; Monogr. vi, p. 378; Novit. Conch, iii, p. 437, pi. 97, f. 26, 

 27. Eucalodimn crosseanum C. & F., Journ. de Conchyl. 

 xviii, p. 22. Ccclocentntm crossconuin FISCH. & CROSSE, Moll. 

 Mex. i, p. 351, pi. 15, f. 16, 16 a. STREBEL, Beitrag iv, p. 60, 

 pi. 6, f , 1 a-d, 5 ; pi. 14, f. 4, 7 A, B. MARTENS, Biologia, Moll., 

 p. 272. 



This is a larger shell than C. filicosta, with finer rib-sculp- 

 ture and a straighter internal column, that of C. filicosta being 

 Swollen within each whorl, while in crosseanum it is hardly 

 perceptibly so. 

 C. FILICOSTA (Shuttleworth). PL 18, figs. 38, 39, 40, 41. 



Shell deeply rimate, cylindric, tapering above, rather thin, 

 light yellowish-brown or greenish, glossy, sculptured with 



