24 ODONTOSTOMIN^. 



solid ; violaceous whitish ornamented with brown flames under an 

 evanescent fulvous cuticle; longitudinally sulcate. Spire pyramidal, 

 ovate, the apex subacute, suture deeply undulated. Whorls 6, sub- 

 ventricose, the last more than half the shell's length, compressed at 

 the base. Aperture vertical, elliptical ; peristome simple, unex- 

 panded, the columellar margin reflexed ; columella thick, subarcuate. 



Length 44, diam. 18 mill. (Rochebr., t. c., p. 118). 



Bangkok (M. Bocourt). 



B. FASCIATA Rochebrune. Shell imperforate, ovate, subsolid, 

 brown under a chestnut epidermis ; spire short, acute, suture deep ; 

 whorls 6, longitudinally lamellose, the last ventricose, encircled by a 

 wide white band, exceeding two-thirds the length of the shell, com- 

 pressed at base. Aperture elongate ; peristome simple, subarcuate ; 

 columellar margin reflexed ; columella straight. Length 22, diam. 

 14 mill. (Rochebr., 1. c.). Bangkok (M. Bocourt). 



The types of both species are in the Paris Museum. Neither has 

 been figured. 



Part II. AMERICAN BULIMULIDTE. 

 Sub-family ODONTOSTOMIN^E. 



Bulimulidce in which the aperture is obstructed by internal lamella?, 

 folds or teeth (rarely absent by degeneration); the base is perforate 

 or has an umbilical suture ; and the genitalia are extremely length- 

 ened. Jaw either plaited or solid. 



Though difficult of diagnosis, this sub-family is clearly a natural 

 group of genera, confined to South America east of the Andes, and 

 with the exception of one or two species, south of the Amazon. That 

 the whole series had its inception in a form in which the character- 

 istic apertural teeth had already been developed, is demonstrated by 

 the fact that these lamella and folds are clearly homologous through- 

 out the species of the several genera. That any such exact corres- 

 pondence could be due to independent acquisition of these structures 

 is almost incredible. It follows from this that the toothless forms, 

 such as Moricandia, are secondarily so, by degeneration of the teeth 

 of their ancestors. Many species show the various stages of tooth- 

 degeneration. 



These genera have been placed by Dr. Paul Fischer in the family 

 Pupidoe ; but their position in the Bulimulidce is unmistakably indi- 

 cated by the exceedingly short kidney, hardly longer than the peri- 



