GASTROCOPTA, NORTH AMERICA, WEST INDIES. 85 



Length 2.1, diam. above aperture 0.9 mm. 



Length 2.4, diam. above aperture 0.95 mm. 



Length 2.45, diam. above aperture 1.1 mm. 



The specimens from the Cuban localities Cayo Piedra and 

 Sierra de S. Vicente have rather weak teeth for this species, 

 but in those from Varadero Park the teeth are as large as 

 usual, the angulo-parietal variable in degree of concrescence. 

 They are also small, length 1.63 to 1.7, diam. 0.75 mm. (pi. 

 18, figs. 10, 12). 



24a. G. barbadensis crassilabris n. subsp. PL 18, figs. 6 to 9. 



The shell is cylindric, the upper third tapering to a veiy 

 obtuse apex, very pale brown, fading to corneous above. 

 Whorls strongly convex, the last flattened, tapering down- 

 ward in its last third, having a low crest behind the outer lip. 

 Angulo-parietal lamella emarginate or bifid in front view, the 

 front end of the parietal projecting a little towards the colu- 

 mella. Columellar lamella, basal and palatal plicae well de- 

 veloped. Peristome expanding and strongly thickened within, 

 pale brown. 



Length 2, diam. above aperture 0.9 mm.; 4^ whorls (type). 



Length 2.2, diam. above aperture 0.9 mm. ; 5 whorls 

 (largest). 



Length 1.8, diam. above aperture 0.8 mm. (smallest). 



Bahamas: near Fort Charlotte, Nassau, N. P., and Man- 

 grove Cay, Andros Island (0. Bryant) ; type and paratypes 

 from the latter locality, no. 180645 U. S. N. M. Also Ber- 

 muda: Somerset (Vanatta) and Paynter's Vale (Peniston). 



The cylindric shape and small diameter distinguish this 

 from the thick-lipped marginalba and rupicola, both of which 

 are known to me by great numbers of specimens, from numer- 

 ous localities. In shape and size, crassilabris resembles pellu- 

 cid'O, but the thick lip and the teeth are more like marginalba, 

 the peristome being thicker and the crest stronger than in 

 barbadensis. There is a marked resemblance between cra-ssi- 

 labris and G. mcclungi. 



There is an albino shell in the type lot. 



The Bermuda form, from Somerset (Vauatta; pi. 18, fig. 





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