200 GASTROCOPTA. 



2 J Form decidedly tapering (3). 



I Form cylindric or subcylindric (6). 



5 Lower palatal fold long, its inner end not visible in a 

 direct front view ; Curaqao group. G. octonaria, p. 199. 

 Lower palatal shorter, wholly visible in a front view (4) . 



4 | Corneous or whitish, the lip white. G. rupicola, xxiv, 58. 

 I Cinnamon-colored, the lip tinted (5). 



5 f A subcolumellar nodule present. G. r. duplex, xxiv, 60. 

 1 No subcolumellar nodule. G. r. marginalba, xxiv, 60. 



g f Angulo-parietal lamella strongly bifid in a front view (7) . 

 I Angulo-parietal lamella simpler, sinuous (15). 



c Small, length about 2 to 2.5 mm., diam. above aperture 

 7. -< 1 mm. or less (8). 



(.Larger, length 2.25 to 3, diam. 1 mm. or more (11). 



r Lower-palatal fold very long, its inner half curved, inner 

 8.-1 end not visible in a front view. Curacao group (9). 

 I Lower-palatal fold of moderate length, straight (10). 



( A strong tubercle below the columellar lamella. 



G. octonaria, p. 199. 

 A tapering butress below the columellar lamella. 

 ^ G. curacoana, p. 197. 



rLower-palatal fold not very deeply immersed. Antilles. 



in J G. barbadensis, xxiv, 83, 85. 



i Lower-palatal fold deeply immersed. Dakota to N. M. 



^ G. r. mcclungi, xxiv, 66. 



( Anterior end of parietal lamella distinctly projecting on 

 ., * J the columellar side of the tooth (in an obliquely basal 

 ' 1 view) (12). 

 ^ Anterior end of parietal lamella not conspicuous (13). 



-. 2 ( Lip-callus marginal. G. p. mcclungi, xxiv, 66. 



' X Lip-callus further within. G. p. sterkiaim, xxiv, 357. 



r Lip heavily calloused (14). 

 13. ■] Lip-callus thin; an infraparietal tubercle often present. 

 (. G. riograndensis, xxiv, 69. 



9. 



