33 Genitalia and Lingual 



The genus Bulimus seems to be characterized by marginal 

 teeth to its lingual membrane of the same type as the laterals, 

 being simply a modification of the latter. Thus far we know 

 the dentition of the following species : B. porphyrostomus, 

 scarabus, odontostomics, glabei^ auris-sileni, midticolor, egre- 

 gius, oblongus, ovatiis, magnificus, Hanleyi, marmoratus^ 

 and aulacostylus. B. auris-sciuri (which appears to be a var. 

 of B. glaber), figured by Guppy and Hogg, may not agree 

 with these, but the figure is too bad to judge from. 



Bulimus auris-sileni, Boru. (Pelecychilus.) 

 St. Vincent. 



For description of jaw and lingual dentition, see Ann. Lye. Nat. Hist. 

 N. Y., X, 222. For figure of latter, see Proc. Phila. Acad. Nat. Sci. 1874, 

 pi. vi, fig. 4. 



The genitalia are figured at natural size as they appear suspended in 

 water. The whole system is very long and slender. The testicle (1) is 

 embedded in the upper lobe of the liver; it is composed of long caeca. 

 The epididymis (2) is convoluted along the half nearer the oviduct. The 

 accessory gland (3) is composed of prominent aciniform caeca. The 

 ovary (11) is short and stout, much broader than the oviduct, lobulated. 

 The oviduct (8) is long, narrow, greatly convoluted. The vagina is long, 

 very narrow. The external orifice is behind the right eyepeduncle. The 

 penis sac (5) is the most prominent organ. It is extremely long, exceed- 

 ing the length of the whole system. It is tubular, of about equal length 

 along thi'ee-foui'ths of its course, where it i-eceives the vas deferens (6) 

 and commences to taper gradually towards the apex, merging into a 

 long, delicate flagellum or lengthened retractor muscle, said muscle being 

 attached to the end. The penis sac does not appear actually to enter the 

 vagina; the two organs terminating side by side. 



The genital bladder (9) is small, globular, its duct (16) is almost as 

 long as the oviduct, of very unequal breadth. For two-fifths of its length 

 beyond the bladder it is delicate, then rapidly expands into a tube as 

 wide as the ovary, then, tapering, becomes again narrow at the com- 

 mencement of the last fifth of its course, but again widely expands before 

 entering the vagina at the upper third of the length of the latter organ. 

 PL IV, fig. V. 



Bulimus glaber, Gmel. (Pelecychilus.) 



Island of Grenada. 



Jaw as in Bulimulus, Cylindrella, etc. 



Lingual membrane long and narrow. Teeth as usual in the Selicince, 

 long and narrow, centrals tricuspid, laterals bicuspid, marginals a simple 

 July, 1874. • 3 Ann. Ltc. Nat. msT.,. Vol. xi. 



