BRACHYPODELLA, S.-G. GYRAXIS. 59 



later whorls, forming an open, corkscrew-like spiral. Apical 

 whorls smooth (except in B. g. sericata and probably B. 

 gouldiana) . Radula as in the typical group of Brackypodella. 

 Distribution, eastern Cuba, with one species in Santo 

 Domingo. It is evidently related to the typical section of 

 Brachypodella, the teeth being modified in much the same 

 manner. In B. turcasiana (pi. 9, fig. 11, an inner lateral tooth 

 in profile, and fig. 12) the central tooth has a cusp wider than 

 the basal-plate, but not so wide as in typical Brachypodella. 

 The lateral teeth are quite as in Brachypodella. There are 

 only 3 or 4 marginal teeth on each side. Type B. brooksiana. 



Key to Species of Gyraxis. 



I. East Cuban forms, with smooth apical whorls. 



1. Neck very long, the free portion about one- third the 

 length of the shell, carinate below, 16 to 18 x 1.8 to 

 2 mm., with 21 to 25 whorls in entire specimens. 



B. brooksiana, no. 15. 



2. Free neck shorter, round, rib-striate; shell shorter; 

 17-18% whorls in entire shells. 



a. Last adnate whorl obtusely carinate below. 



B. gundlachiana, no. 16. 



b. Last adnate whorl roundly tapering below; 

 neck shorter. B. turcasiana, no. 17. 



II. Haitian species, with the apical whorls delicately ribbed; 

 last whorl becoming free, the neck angular below. 



1. Shell turrite, very densely costulate-striate, the 

 suture subdenticulate ; 10 x 2.3 mm., with 9 whorls 

 remaining. B. gouldiana, no. 18. 



2. Shell widest at the upper third, the striation exces- 

 sively fine and close ; suture even. 10 to 12 x 2 mm., 

 with 13 whorls in entire, 11 in truncate shells. 



B. g. sericata, no. 18a. 



15. B. BROOKSIANA (' Gundl. ' Pfr.). Vol. XV, pi. 62, figs. 



20, 21; pi. 64, fig. 7. 



Shell thin, corneous-white, slender, fusiform, widest at the 

 upper third or fourth of the length, rather rapidly tapering 



