ODONTOSTOMUS. 61 



vi, 76. B. pupoides REEVE, Conch. Icon. pi. 38, f. 231 ; pi. 80, f. 

 593. Pupa pupoides DESH. in Fer., Hist., p. 216, pi. 162, f. 21, 22. 

 ? Helix (Cochlodonta} listeri FERUSSAC, Prodi., Tabl. Syst. p. 60, 

 no. 491 (see below), and ? Helix (Cochlodonta) brasiliensis FERUSSAC, 

 Prod., Tabl. Syst., p. 60, no. 492, based upon Mawe, Travels in the 

 interior of Brazil, third plate, fig. 6 (1812). 



All gradations between four- and seven-toothed extremes occur in 

 the series before me, showing fasciatus to be merely one term in a 

 continuous series of variations. Pfeiffer's description of B. pupoides 

 in the Monograph i a, and his figures in the Conchylien Cabinet, per- 

 tain to the four-toothed form fasciatus, not to the original type of 

 Spix and Wagner, which had six teeth, and is identical with the B. 

 sexdentatus of Pfeiffer and Reeve, but not of Spix. In some speci- 

 mens the dark stripes are almost obsolete ; and this appears to have 

 been the case with Wagner's type. Fig. 46 is a Bahia specimen re- 

 ceived from von Iliering, intermediate between fasciatus and secti- 

 labris, having the numerous whorls of the latter. 



Form fasciatus (Pot. et Mich.). PI. 11, fig. 43. Similar to the 

 type but with only four teeth developed : parietal and columellar 

 lamellae, and upper and lower palatal folds; the basal and suprapal- 

 atal folds of typical inflatus being absent. The spire is conspicu- 

 ously striped and there is a blackish smear behind the lip, showing 

 deep brown between the folds within. 



Var. sectilabris (Pf'r.). PI. 11, figs. 47-53. Similar to 0. in- 

 flatus but larger, with 9^ to 10 whorls, the suture more crenulated, 

 and very deeply cut on the last half whorl ; umbilicus rather ample 

 within. Teeth usually 6 or 7, arranged as in inflatus; grooves at 

 the end of the outer lip and columella deep, the latter emphasized by 

 a ridge below and callus above it. 



Length 30J, diam. 12, aperture 13 mill. 



Length 25-29J, diam. 10, aperture 10^ mill. 



Province of Bahia. 



A series of 39 specimens in the collection of the Academy shows 

 that sectilabris is merely a large race of inflatus. There are all man- 

 ner of intermediate sizes, and degrees of impression of the grooves at 

 the lip ends and the subsutural furrow. The degree of inflation of 

 the spire is also subject to great individual variation. 



Helix (Cochlodonta) listeri Ferussac, Prodr. p. 60, no. 491, based 

 upon Lister, pi. 31, f. 29, is an Odontostomus which Pfeiffer refers to 



