CONCHOLOGY. 49 
P. cerulescens. P. aurantia. 
P. elongata. P., fragilis. 
P. flavicans. P. livida. 
P. sqamosa. P. galathea. 
P. pulchella. 
P. lusoria.* P. Pacifica.* 
P. fusca.* P. Florida.* 
3. Genus Psammotza. Pl. VII. 
Animal. Unknown. 
Shell. Of the same form as the Psammobia, but differing in 
the number of teeth, the left valve of the Psammotza having only 
one tooth; and sometimes one valve is without teeth, while the 
other has two; ligament exterior, attached to callosities at the 
hinge, and without an irregular plait. Inhabits the Australian 
seas. Seven species. One fossil species. 
Psammotea violacea. Psammotea candida. 
P. zonalis. P. tarentina. 
P. pellucida. P, donacina. 
P. serotina. 
N. Tettmnaria. Seven Genera. 
The two last of these genera have no lateral teeth, the rest have 
one or two. 
4, Genus Telina. Pl. VII. 
Animal. Body triangular, much compressed : the free edge of 
the mantle furnished with a row of tentacular, largest and longest 
in the rear; foot very large, compressed and pointed to the front; 
buccal appendages nearly as large as the bronchial lamine, of 
which the external pair are much smaller than the internal ; the 
anterior contractile muscle larger than the other; tubes very dis- 
tinct. 
Shell. Of a somewhat variable form, generally striated longi- 
tudinally and much compressed, equivalved, more or less inequi- 
lateral; the anterior side almost always longer and more rounded 
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