EXPIvANATION OF PLATE XII. 

 Figs, i, 2. — Pleurotoma (Gemmula) congener^ E. A. Smith. 



a, b, c, ventral, dorsal, and profile aspects, natural size ; d, e details of aper- 

 ture, X 3-5. 



Fig. 3. — Pleurotoma {Gemmula) congener, E. A. Smith. 



a, b, c, ventral, profile, and dorsal aspects of protoconch, X 6. 



Fig. 4. — Pleurotoma {Gemmula) congener ^ E. A. Smith. 



Protoconch of another specimen to illustrate its obliquity^ X 6. 



All the specimens were obtained from 185 fathoms, in Lat. 13° 17' 15" N., 

 Long. 93° 10' 25" E. in the Andaman Sea. 



