GASTROCOPTA, SOUTH AMERICA. 89 



the margin of the aperture. The anterior part of the last 

 whorl, just behind and parallel to the labrum, exhibits a 

 longitudinal swelling or varix, towards which the lip ex- 

 pands" (Smith). 



I have not seen Pupa solitaria, which on account of its re- 

 mote locality, may prove to have some special characters. 

 The figure shows a more ovate contour than B. barbadensis, 

 but with no other differences from that shell. I strongly sus- 

 pect that, like the three species of Opeas on the same island, 

 a comparison of specimens will show that it is not separable 

 from the Antillean species. Both Opeas and Gastrocopta 

 might easily be introduced. Provisionally it may be ranked 

 as a subspecies. 



25. GASTROCOPTA POLYPTYX n. sp. PI. 17, figs. 5, 6, 7. 



The parietal and angular lamellae are more separated than 

 in barbadensis. There is a distinct infraparietal nodule. The 

 horizontal columellar lamella turns upward at its inner end, 

 and there is a well-developed subcolumellar nodule. The 

 upper palatal plica is rather large and runs obliquely down- 

 wards; lower palatal long and deeply placed. Basal fold 

 thicker than in barbadensis, and prominent. The color is 

 from corneous to pale brown. 



Length 1.8, diam. above aperture 0.8 mm. 



Length 1.7, diam. above aperture 0.75 mm. 



Distribution. St. Thomas (type loc.) ; Jamaica (A. D. 

 Brown coll.) ; Bermuda (Swift coll., from C. B. Adams). 



This appears to be a species of the barbadensis stock in 

 which the apertural lamellae are very strongly developed and 

 the average size smaller. The specimens seen from Jamaica 

 and Bermuda are not from original collectors, and the species 

 has not turned up in the very large amount of material col- 

 lected in these islands in recent years. 



II. SOUTH AMERICAN SPECIES OF GASTROCOPTA. 



Few Pupillida are known from South America, most of 

 them belonging to Gastrocopta. The two subgenera repre- 

 sented occur also in North America, and the species are closely 



