198 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



The interior, quite of the last portion of the rectum, is provided with 

 several longitudinal folds which appear to project from the inner 

 surface of the lining at this point (Fig. 1 A, E.F.). 



The genital system is simple, without accessory organs, and similar 

 to Aehatina, but the penis (Fig. 2 A, F.) is provided with a true 

 retractor (Fig. 2, H.JI.), terminal, and inserted distally on the 

 diaphragm. The penis is enclosed in a glossy muscular sheath, and 

 when freed is seen to be rather a slender organ. The vas deferens 

 (Fig. 2, V.B.) enters through the wall of the sheath, having attached 

 to it a strong muscular band (Fig. 2 B, M.B.), the other end of which 

 is fixed to the base of the penis. This muscular band appears to be, 

 though contained by the sheath, practically free from it, as far as 

 attachments are concerned. The penis is directed to the left, the 

 terminal retractor passing over the buccal mass just in front of the 

 points of entry of the ducts of the salivary glands, its distal end being 

 inserted on the very front edge of the floor of the lung-chamber, close 

 to its junction with the mantle, at a point about in line with the left 

 tentacle, thus conforming to Limicolaria Vanattce and Cochlitoma 

 Crmvfordi, in the terminal penis retractor being inserted on the lung- 

 floor, and mentioned by Pilsbry (Man. Conch , vol. xvii, p. viii), 

 though no mention is made of the position of insertion in the area of 

 the floor. After leaving the muscular sheath enveloping the penis, 

 the vas deferens is free till it joins the prostate gland (Fig. 2 C, Pr.) 

 at the base of the uterus (Fig. 2 C, Ut.). The male portion of tlie 

 generative canal runs as a separate tube, enveloped by the membrane 

 of the uterus. 



The vagina (Fig. 2 C, Vg.) is short and stout, 10-15 mm. in lengtli in 

 the different specimens examined, somewhat swollen at the point of 

 insertion of the spermatheca-duct, which is about 15 mm. in length. 

 The spermatheca itself varied very considerably in shape in the 

 specimens containing eggs, compared with the specimen that did not. 

 In the former case it appeared as a more or less roughly triangular, or 

 pear-shaped, somewhat flattened sac, with the duct inserted at one 

 side, some distance from the base (Fig. 2 C, Sp.)^ whereas, in the 

 non-pregnant or but recently pregnant animal, this organ might be 

 called almost fusiform, the duct, it is true, being inserted a little to 

 the side (Fig. 2 D), the only .sign of a possible capability for swelling 

 at the base being seen in some slight corrugations on the lower part 

 just above the point of insertion of the duct. The organ was about 

 the same length as its duct, viz. 15 mm. The free oviduct (Fig. 2 C, 

 F.Od.) is about the same length as the duct of the spermatheca. 

 The oviduct proper is of the usual form in the specimen in 

 which no eggs were contained ; in the other two cases it was much 

 distended, with almost transparent walls. The eggs, all of which 

 were contained in a calcareous shell, varied in size from 4 mm. in 

 length and 2"75mm. in breadth to 8'5 mm. in length and 6-5 mm. in 

 breadth. There were no free embryos. From the two specimens 

 I counted 154 eggs. The albumiuiparous gland (Fig. 2 A, A.Gl.) is 

 very similar to that usually found among most of the groups of 

 pulmonates, as far as I know. The duct of the ovotestis, which is 



