^:::0 APPENDIX. 



PLATE VIII. 



MOLLUSCA. 



Nassa eeticulata. pi VIII. fig. 2, a, h, c, d, e,f. 



A VERY active Mollusc, given here cliiefly on 

 account of tlie opportunity afforded by the birth of 

 young fry in Mr. Lloyd's tanks. The Nassa feeds on 

 small animalcules, for which, in aquaria, it may be 

 seen routing among the sand and stones, sometimes 

 burying itself among them so as only to show its 

 caudal tube moving along between them. A pair of 

 Nassse in Mr. Lloyd's collection, deposited, on the 

 5th of April, about fifty capsules or bags of eggs 

 upon the stems of w^eeds (fig. 2 h) ; each capsule con- 

 tained about a hundred eggs. The capsules opened 

 on the 16th of May, permitting the escape of roti- 

 ferous fry (fig. 2, c, d, e), not in the slightest degree 

 resembling the parent, but presenting minute nautilus- 

 shaped transparent shells. These shells rather hang 



