226 ZONITID^E. 



Helix turbiniformis, Bs. J. A. S. B. vii, 1838, p. 218 (no description): 

 nee Pfr. 1839. 



Shell subperf orate, subtrochif orm , thin, not polished above, 

 faintly striated obliquely, with longitudinal (spiral) raised lines 

 often obsolete on the lower whorls, and finer ribbing intercalated 

 between them, translucent, greyish horny ; spire conical, suture 



B 



[Fig. IS.Sitala infula. 



A. Animal from life (after Stoliczka). 



B. Mantle-zone, showing shell- and dorsal lobes (after Stoliczka). Enlarged. 



C. Jaw. X 30. 



D. Teeth of radula. X 475. 



E. Generative organs (after Stoliczka). Enlarged. 



Sitala attegia. 



F. Generative organs (after Stoliczka). 



Sitala vulcania. 



G. Part of the generative organs, x 3'4.] 



