CER10N, GROUP IV. 197 



whorls the riblets are somewhat arcuate and oblique, but become 

 straight on the lower ones. Whorls 10, very narrow, but slightly 

 convex, separated by a simple, impressed suture. Aperture almost 

 circular, with a strong fold on the parietal wall and a smaller one on 

 the columella. Peristome continuous, with thick, reflexed outer lip. 

 Yellowish-white, with pale reddish-yellow, irregular markings, chiefly 

 confined to the interstices ; the aperture pale yellowish. Length 9, 

 width 3f lines (18x7^ mill.). (Kuester.) 



Locality unknown; type in coll. K. University of Erlangen (Kues- 

 ter). Cuba: Cayo Frances (Gundlach). 



Pupa cyclostoma KUESTER, Conchyl. Cab., p. 6, pi. 1, f. 5, 6 

 PFR., Monogr., ii, p. 316. ARANGO, Fauna, p. 102. 



This species is the senior member of a group of closely related 

 forms which have not been satisfactorily discriminated, and more 

 ample material with exact locality data must be had before they can 

 be understood. Under the circumstances I consider it best to give 

 the original descriptions and copies of the original figures. The ital- 

 ics are my own. 



Shells which seem to me referable to C. cyclostomum are before me 

 from Cabo San Antonio, the western extremity of Cuba, sent by 

 R. Arango, have a heavily calloused parietal wall, with small and 

 short parietal lairiella. The aperture is white or nearly so within, 

 and the reflexed lip is thickened. There are 29 to 31 rounded rib- 

 lets, as wide as their intervals, on the penultimate whorl. One of 

 these specimens is figured on plate 32, fig. 19. 



Var. KUSTERI (Pfeiffer). PI. 32, figs. 15, 16, 17, 18. 



Shell deeply and shortly rimate, ovate conic, somewhat solid, reg- 

 ularly ribbed with rather close riblets, thickened at the sutures ; 

 whitish, streaked and marbled with pale corneous. Spire swollen in 

 the middle, then regularly tapering in a somewhat obtuse cone. 

 Whorls 8^, a little flattened, the last about two-fifths the total length, 

 somewhat ascending in front, the base slightly compressed. Aper- 

 ture slightly oblique, semi-oval, with parietal and columellar folds ; 

 peristome narrowly expanded, the margins joined by a thin callus. 

 Length 12, diam. above the middle 6 mill. (Pfr.). 



Habitat unknown. 



Pupa kusteri PFR., P. Z. S., 1852, p. 69, no. 61 ; Monogr., iii, p. 

 540. KUESTER, Conchyl. Cab., p. 165, pi. 20, f. 3-6. 



