EXPLANATION OF PLATES. 



MOLLUSCA. 



PLATE V. 

 Figs. 1, la.—Pontiothauma mirabile, E. A. Smith, Annals 

 and Magazine of Natural History, (6), XVI. July, 1895, P- 2 - 



Figs, 2, 2a. — Pontiothauma abyssicola, E. A. Smith, Annals 

 and Magazine of Natural History, (6), XIV. July, 1895, p. 3. 



