94 GASTROCOPTA, SOUTH AMERICA. 



Ceballos, Quebrada de Musi, etc.; also Bajo de Veils, in the 

 Sierra de S. Luis (Doering). 



P. [upa] dessini DOERING, Apuntes, etc., in Boletin de la 

 Academia Nacional de Ciencias de la Rep. Argentina, iii, 

 1879, p. 83. 



"It is very easy to distinguish this little species from the 

 others by its delicacy, the cylindrically conic shape, the pro- 

 nounced convexity of the whorls, and by the depth of the 

 suture. The striae of growth are usually quite conspicuous." 



It seems from the above account to resemble G. nodosaria. 



30. GASTROCOPTA NODOSARIA (Orbigny). PL 17, fig. 10. 



The shell is pupoid, oblong, noticeably umbilicate, thin, 

 smooth; spire cylindric with truncate summit, composed of 

 six swollen whorls separated by a deep suture. Aperture 

 oval, provided with a large, as though bidentate, lamella on 

 the parietal wall. Margins noticeably reflected. Color uni- 

 form grayish-fawn. Length 2, width % mm. (Orb.). 



Bolivia: at a place called Pampa Ruis, Province of La 

 Laguna, in the last foothills of the eastern slope of the Andes ; 

 under stones and moss (Orbigny). 



Helix nodosaria ORB., Mag. de Zool., 1835, p. 22. Pupa 

 nodosaria ORB., Voy. dans 1'Amerique Meridionale, p. 322, pi. 

 41 bis, f. 12-14. 



Orbigny adds that this Pupa has the shape of the preced- 

 ing [P. paredesii], but it differs by the smaller size, the ab- 

 sense of raised riblets, and by having a lamella in the aper- 

 ture. It is rare, and difficult to collect on account of its ex- 

 treme thinness. 



It may be conjectured that this is a member of the G. pel- 

 lucida and barbadensis group, really having more teeth than 

 it has been credited with. 



31. GASTROCOPTA WOLFII (Miller). PL 28, figs. 1, 2, 3, 4. 

 The shell is subperforate, cylindric-ovate, thin, very deli- 

 cately obliquely striate or costulate, brownish, the apex rather 

 obtuse ; whorls 5, convex, separated by a deep suture, the last 

 about one-third the length. Aperture suboblique, truncate- 



