210 Description of Hemphillia, 



outward appearance, and by its non-spiral shell. This shell, 

 however, in Hyalimax is almost, if not completely, internal, 

 while the shell of Hemphillia is entirely exposed. 



Binneia, in its prolonged mantle and costate jaw, 

 resembles Hemphillia, but its shell is much more developed, 

 spiral, striate and almost capable of protecting, though not 

 absolutely including, the animal when contracted. 



Xanthonyx and Simpulopsis are both described with costate 

 jaw, but they have both highly developed, decidedly spiral 

 shells. 



Finall}^ from all the above mentioned genera and from all 

 known sublimaciform genera, our genus is at once distin- 

 guished by the peculiar hump-like process on the tail, re- 

 minding one of the caudal process in JSfanina. 



EXPLANATION OF PLATE IX. 



Fig. 1. Hemphillia glandulosa. 



The caudal extremity greatly enlarged. 



Fig. 2. Succinea appendiculata Pfr. 



From Governor Rawson; a portion of the jaw. 



Fig. 3. Same as fig. 1, enlarged. 

 From a specimen preserved in alcohol. 



Fig. 4. Pellicula depressa Raug. 



The jaw; copied from Fischer, Mel. Conch., I. c. 



Fig. 5. Same as fig. 1. The shell, enlarged. 

 Seen from above. 



Fig. 6. Succinea appendiculata Pfr. 



From Governor Eawson, slightly enlarged, the right hand figure 

 showing profile of appendage. 



Fig. 7. Siinpulopsis sulculosa Fer. 



A marginal tooth, copied from Heynemann, Mai. Blatt., 1868, pi. 

 V, fig. 10. 



Fig. 8. Same as fig. 7 ; centrals and laterals. 

 Fig. 9. Succinea appendiculata Pfr. 



From Governor Rawson ; centrals and laterals. 



Fig. 10. The same ; marginal tooth. 



