90 GASTROCOPTA, SOUTH AMERICA. 



related to Antillean and continental North American forms. 

 Some species (oblonga, miliola, clessini) are deficient in teeth, 

 like the northern parvidens and riisei. 



For other South- American Pupre, see the genera Gibbulina, 

 Bothriopupa, Sterkia and Pupoides. Pupa plusiodonta ap- 

 pears from the description to be an Abida (Torquilla), and I 

 venture to suggest that the single specimen is really a Euro- 

 pean shell, which got among Argentine shells by accident. 



No useful key to species can be constructed, as several 

 species are quite imperfectly known. They may be arranged 

 as follows : 



I. Angular and parietal lamellae united into a single sin- 

 uous lamella, sometimes bifid at the tip (subgenus Gas- 

 trocopta, restricted). 



24&. G. barbadensis solitaria (Smith). Fernando No- 

 ronha, p. 88. 



26. G. servilis oblonga (Pfr.). Amazon Eiver to Ar- 

 gentina. 



27. G. miliola (Orb.). Rio Janeiro, eastern Bolivia. 



28. G. microdonta (Doering). Argentina. 



29. G. clessini (Doering). Argentina. 



30. G. nodosaria (Orb.). Eastern Bolivia. 



31. G. wolfi (Miller). Western Ecuador. 



32. 6r. munita (Reibisch). Galapagos. 



33. G. clausa (Reibisch). Galapagos. 



II. Angular and parietal lamella diverging forward, becom- 

 ing separate in front (subgeuus Immersidens) . 



34. G. dicrodonta (Doering). Argentina. 



35. G. iheringi (Suter). Southern Brazil. 



36. G. pazi (Hidalgo). Peruvian Andes (? Ecuador, 

 ? Panama). 



III. Characters uncertain. 



37. Pupa curta Anton. Chili. 



26. GASTROCOPTA SERVILIS OBLONGA (Pfeiffer). PI. 17, figs. 9, 

 14, 15. 



The shell is subperforate, oblong, thin, nearly smooth, little 

 shining, pellucid, corneous-buff, gradually tapering upwards, 



