CRYPTOPHTHALMUS. 23 



same author, and during the latter part of that year 

 (August 1850) under the name of Glauconella by Dr. 

 Gray. The name we have used therefore bears priority, 

 the term ' Thecaphorus' 1 being a manuscript name of 

 Nuttall. 



Species of Smaragdinclla. 



glauca, Quoy and Gaim. viridis, Rang. 



miuor, A. Adams. 



Sub -gen. nona, H. and A. Adams. 



Shell internal, sub-trigonal, slightly involute, white, fragile ; 

 inner lip with a cup-shaped appendage, sub-spiral within ; outer 

 lip expanded, angulated and produced posteriorly. 



Algirae, Hanley. 



Genus CRYPTOPHTHALMUS, Ehrenberg. 



Body semi-cylindrical, in form like an Aplysia without 

 tentacles. Head depressed, fleshy, the margins free ; eyes 

 small, lateral, under the free margins of the head-disk. 

 Mantle covering only the base of the shell. Foot with 

 two lateral wing-like lobes, reflexed and folded over the 

 back, involving the whole body, and forming a branchial 

 aperture at the hind part. 



Shell scarcely involute, horny, fragile, destitute of colu- 

 mella and spire ; aperture wide. 



Ex. C. olivaceus, Ehrenberg, pi. 58, fig. 1. Shell, C. 

 olivaceus, fig. 1, , 1, b. 



The animal of the only species of this genus known is 

 of a line emerald-green colour, and has been described 



