22 BULLID.E. 



Genus SMARAGDINELLA, A. Adams. 



Animal partially investing the shell. Eyes sessile on 

 the middle of the frontal disk. Mantle included within 

 the shell, ending posteriorly in a thickened lobe. Foot 

 with the side-lobes free, not united to the head, enlarged 

 in the form of wings which unite behind and cover a por- 

 tion of the shell. 



Shell oval, depressed, slightly convolute, green or glau- 

 cous ; aperture very wide, canaliculated posteriorly ; inner 

 lip with a cup-shaped appendage, spiral within. 



Syn. Linteria, A. Adams. Glauconella, Gray. The- 

 caphorus, Nutt. 



Ex. S. viridis, Rang, pi. 57, fig. 7. Shell, S. viridis, 

 fig. 7, a. 



The lateral lobes of the foot being free and unconnected 

 with the head in front, the form of the cephalic buckler or 

 head-disk, and the cup-shaped lamina arising from the 

 apex and ending on the columellar margin of a depressed, 

 open shell, will serve to distinguish this genus. The ani- 

 mal is amphibious in its habits, living on moist rocks within 

 reach of the spray, and on rocks weeping fresh-water 

 near the sea-shore. Both animal and shell are of a glau- 

 cous green colour. 



This genus was first characterised and published by 

 one of the authors in 1848, in the appendix to Sir Edward 

 Belcher's " Narrative of the Voyage of H. M. S. Samarang," 

 p. 475, under the name of Smaragdinella. It was after- 

 wards published in Sowerby's Thesaurus Conchyliorum, 

 together with Phanerophthalmns and Chelidonura, in the 

 beginning of 1850, under the name of Linteria, by the 



