92 GASTROCOPTA, SOUTH AMERICA. 



Length 2.35, diam. above aperture 1.15 mm. (fig. 14, Forta- 

 leza) . 



Length. 2.1, diam. above aperture 1.1 mm. (fig. 15, Para). 



It does not seem to me specifically distinct from G. servilis. 

 By the weakness of the teeth it resembles G. s. riisei, which 

 was evidently derived from servilis. 



27. GASTROCOPTA MILIOLA (Orbigny). 



Shell oblong, short, perceptibly umbilicate, quite thick, 

 smooth; spire short, swollen, with the summit very obtuse as 

 though truncate, composed of 5 swollen whorls separated by 

 a deep suture. Aperture rounded, provided with three teeth, 

 one on the parietal wall, the two others smaller, on the left 

 margin. Color whitish or fawn. Length 2, width 1 mm. 



Brazil: environs of Rio de Janeiro, under dead leaves. 

 Bolivia: province of Santa Cruz de la Sierra, in the last 

 mountains. 



HeUx miliola ORB., Mag. de Zool., 1835, p. 17. Pupa mili- 

 ola ORB., Voyage dans 1'Amer. Merid., p. 323. DOERING, 

 Boletin Acad. Nac. Ciencias de la Rep. Argentina, iii, 1879, 

 p. 84. 



According to Orbigny, this species is shorter than paredesii 

 and nodosaria, with nearly the same form. It has not been 

 figured. 



Doering has identified a species from the Sierra de Cor- 

 doba, in shady, humid places in the valleys of the Rio Pri- 

 mero, Rio Ceballos, etc., with Orbigny 's species. He describes 

 it as having parietal and columellar lamellae and a deeply- 

 placed lower palatal fold. 



Rio Janeiro may be selected as the type locality. Until 

 specimens from there can be examined, the characters of the 

 species will remain uncertain. 



28. GASTROCOPTA MICRODONTA (Doering). 



"Shell ovate-conic, thin, somewhat glossy, nearly smooth, 

 brownish-corneous. Spire conic-ovate, apex tapering, very 

 obtuse. Whorls 5^, a little convex, the last about one-third 

 the length. Aperture semioval, five-toothed: one compressed, 



