146 UKOUOPTIS OF JAMAICA. 



C. augustcz. "Shell not very slender, cylindrical in the 

 lower three-fourths, slightly tapering above; pale wax color; 

 with very minute crowded transverse strife; anterior spiral 

 keel not very prominent ; apex broadly truncate, with the loss 

 of - whorls; whorls remaining nine, a little convex, with a 

 well-impressed suture; aperture moderately produced beyond 

 the penult, whorl, suborbicular, a little dilated at the left of 

 the upper side ; lip well expanded, moderately reflected. This 

 species is allied to the preceding, and to C. montana. 



"Length .65 inch; breadth .17 inch." [1614x414 mm.] 

 (C.B.Ad.). 



At Comfort Hall, Trelawny, Mr. Jarvis found a form sim- 

 ilar to hollandi in size and shape, but with the basal keel 

 weaker and the striation finer, though not quite as fine as in 

 U. hydrophana. Some specimens have the occasional dark 

 striaB of hydrophana. It is an intermediate race. 



21. U. HYDROPHANA (Chitty). PL 34, figs. 19-21, 29-31. 



Shell cylindric, the upper half slowly tapering; broadly 

 truncate; general color dingy brown, but under a lens the 

 strice are ivhitish except for irregular patches and occasional 

 narrow streaks, where they are dark like the intervals. Sur- 

 face glossy, the striation very fine and regular, strife being 

 much closer than in U. hollandi, and as ivide as the intervals. 

 Whorls 10 to lli/i>, but slightly convex, the last rounded below, 

 with only a weak keel, shortly produced forward. Aperture 

 somewhat oblique, circular ; peristome expanded and reflexed, 

 white, or brownish below, continuous. Internal axis straight. 



Length 15.5, diam. 3.8 mm. ; whorls 11%. Manchester. 



Length 14.6, diam. 4 mm. ; whorls 10. Manchester. 



Length 15, diam. 3.5 mm. ; whorls 10. Chitty 's type. 



Jamaica: Durham, ? Trelawny (Chitty) ; Manchester (coll. 

 A. N. S.). 



Cyl. hydrophana CHITTY, Contrib. to Conch., p. 12 (1853). 

 -PFR., Monogr., iv, p. 699 ; Conchyl. Cab., p. 21, pi. 9, f . 3-5. 



A rare species in collections, much more closely and finely 

 striate than U. hollandi, and remarkable for its patches or 

 streaks of darker striae. Figs. 19-21 are from Pfeiffer, but 

 fig. 29 shows better the fine striation and peculiar streaks. 



