PLATE XXX. 



Fig. 1. Pleurotomaria Adansoniana C. & F. Redrawn by McConnell from 

 water-color sketch from life by J. H. Blake. The shell is merely 

 indicated. Page 400. 



" 2. Anterior termination of gill in P. Adansoniana. a, osphradium ; 

 b, blood sinus (?). Only the inner series of gill lamellae is here indi- 

 cated. At this part of the gill they are narrow and pointed ; farther 

 back, they become broader and more rounded at the distal end. 



" 3. Posterior free termination of intestine (c) lying on the glandular 

 (renal ?) organ, behind which in the commissure are two orifices on 

 each side (a), with a short bunch of papilla? behind them and the 

 flaps of the mantle with their papillose edges (b) corresponding to the 

 edges of the sinus on each side. Page 400. 



" 4. Another specimen. Page 400. 



" 5. The first specimen crawling. Page 400. 



" 6. The head, viewed from above. Page 400. 



