202 



GASTROCOPTA. 



' Length 2.2 to 2.4, diam. above aperture 0.95 mm. St. 

 Thomas. G. s. riisei, xxiv, 74. 



. Slightly narrower, with deeper suture ; Arizona. 



G. p. parvidens, xxiv, 80. 



Length 1.36 to 1.55 mm., 4 to 4y 2 whorls ; very thin and 



fragile ; Bimini Islands. G. p. delicata, xxiv, 78. 



Gastrocopta geminidens (Pils.). This species, described 

 as a Bothriopupa, vol. xxiv, p. 228, is now transferred to 

 Gastrocopta. It will probably form a new subgenus. 



Gastrocopta curacoana Pilsbry. Text-figures 1 to 4a. 



The shell is slender, subcylindrie, slowly tapering to the 

 obtuse summit ; cinnamon brown, paler near the apex, weakly 

 striate obliquely. The whorls are strongly convex, the last 



Figs, i, 2. — i, ib, G. curacoana, type, la, ic, profile and basal views of opened 

 topotype. 2, 2a, profile and face views of a specimen from Seroe Djerimi, Curacao, 

 having an infraparietal tubercle. 



half of the last one conspicuously flattened and slightly im- 

 pressed laterally over the region of the palatal fold, not 

 crested behind the lip. The angulo-parietal lamella is strongly 

 bifid, the parietal lobe higher, and in basal view its anterior 

 end merges into the angular, without forming a little projec- 

 tion on the columellar side. The columellar lamella is strong 



