SIMPULOPSIS, PELTKLLA. 



Mexican Species. 

 S. simula Morel., xii, 219. S. cumingi Pfr., xii, 220. 



Section BULIMULOPSIS Pils., 1899. 



Manual xii, p. 220. The soft anatomy of this group is unknown. 

 T)pe S. pseudosuccinea. The species are Brazilian. 



S. pseudosuccinea Moric.,xii, 221. S. boissieri Moric., xii, 222. 



moricandi Pfr. S. progastor Orb., xii, 223. 



S. citrinovitrea Moric., xii, 221. 



B. vitrinoides Rve. 



Subgenus PLATYSUCCINEA Ancey, 1881. 



Manual xii, p. 223. S. senea is Mexican, the other species Antil- 

 lean. 



S. portoricensis Slmtt., xii, 224. S. dominicensis Pfr., xii, 225. 

 S. psidii Mart., xii, 224. S. aenea Pfr., xii, 225. 



Genus PELTELLA Webb and Van Beneden, 1836. 

 Manual, xii, p. 231. v. Ihering, Malak. Blatter (n. F.), viii, p. 57 

 (anatomy). 



Slug-like, with the mantle large posterior, elevated, and perforate 

 over a //a/iofts-shaped fragile shell, consisting of between \\ and 2 

 whorls. The jaw is highly-arched, closely plaited, very narrow in 

 the middie (pi. 62, fig. 36). The radula is large, with 93.1.93 teeth 

 in nearly straight transverse rows. The basal plates of the teeth 

 are rhombic. Median tooth unicuspid, laterals with three cusps, as 

 in Drymaus (pi. 61, fig. 26). The genital system (pi. 62, fig. 37) 

 resembles that of Bulimulus excep-t that the duct of the spermatheca is 

 very short. The free retractor muscles are shortly united proximallyr 

 The columellar muscle is apparently degenerate. An excellent ac- 

 count of the anatomy has been given by Von Ihering, who first 

 referred Peltella to the Bulinwlidtz. 



The genus is very distinct in many respects, and especially in the 

 shortness of the duct of the spermatheca, the anal pouch, apparent 

 absence of the columellar muscle, and of course the modifications con- 

 sequent upon the reduction of the shell. The teeth of the radula 

 seem to be almost identical in form with those of Drym&us. 



P. palliolum Fer., xii, 231. Brazil, near Rio de Janeiro. 



