Dentition of Pulmonata. A 35 



It will be noticed that the cutting point on the central tooth of B. 

 Altoperuvianus is more produced than in B. Lobbi, to which I have com- 

 pared the dentition. 



Bulimulus Peruvianus, Brug. (Plectostylus.) 



Talcahuana, Peru. Museum of Comparative Zoology, 

 Cambric! &e. 



o 



Jaw and lingual dentition already described by me. (Proc. Ac. Nat. 

 Sc. Phila., 1874, 53, pi. V, fig. 2.) 



The genital system is figured on pi. I, fig. vin. The testicle (1) is 

 extremely large, apparently composed of aciniform caeca. The epidid- 

 ymis (2) is long, very thick, and greatly convoluted in its whole course. 

 The ovary (11) is long and slender. The oviduct (8) is long and narrow. 

 The vagina is short. The short duct (16) of the genital bladder (9) 

 enters at its upper end. The genital bladder is very stout, almost as 

 thick as the oviduct, tapering above gradually to a long flagellate point. 

 The penis sac (5) enters the vagina near its lower end. It is smaller than 

 the genital bladder, cylindrical, tapering gradually towards the apex, 

 where it has a flagellate appendix, into the end of which, perhaps, is 

 inserted the retractor muscle. The vas deferens enters the penis sac at its 

 upper end. The external orifice of the generative organs is behind the 

 right eyepeduncle. 



Bulimulus Lobbi, Rve. (Drymceus.) 

 Between Balsas and Cajamarca. Prof. Orton. 



The genital system is quite similar to that which I have figured of B. 

 Altoperuvianus (pi. I, fig. n), the ovary (11), however, is much larger 

 than in that species. The testicle (1) is composed of short, bluut caeca; 

 it lies near the ovary. The epididymis (2) is short. The accessory 

 gland (3) is composed of several long, threadlike caeca. The ovary is 

 long, equalling one-third of the oviduct, and twice as broad. The oviduct 

 (8) is long, convoluted, narrow, with deeply scalloped edges. The vagina 

 is short, tubular, receiving the duct of the genital bladder near its top, 

 and the opening of the penis sac just above its base; between the two 

 there is a short decided expansion of the vagina. The penis sac (5) is 

 long and slender, with a long, flagellate extension, on the end of which 

 the retractor muscle (6) is attached. The vas deferens (7) enters the 

 penis sac at about the middle of its length. The genital bladder (9) is 

 small, globular, on a delicate duct (16) equalling in length the vagina and 

 oviduct combined. The external orifice of generation is behind the right 

 eyepeduncle. 



The jaw (pi. I, fig. vi) is arcuate, with attenuated, blunt ends, thin, 

 transparent, of the same type as is common to Bulimulus, Cylindrella, 

 Amphibulima, Gceotis, etc., i. e., with narrow, distant ribs, running ob- 



