46 CONCHOLOGY. 



T. donacina. The Donax-like Tellen. PI. 9, fig. 5. 



Sub-oval, flattish, semi-striated and semi-pellucid ; hinge 

 with two teeth in one valve and one in the other ; pale yel- 

 low, radiated longitudinally with pink. 



T. depressa. The depressed Tellen. 



Oval, flat, pointed at the smaller end and slightly reflected ; 

 pale yellowish colour, faintly striated concentrically ; covered 

 with a pale brown epidermis. 



5. Tellinides. One species. 



Though this genus bears a great afiinity to many others, 

 it cannot be united with any ; having lateral teeth, it differs 

 from the Psammobia ; by not having the valves twisted, it 

 diff'ers from the Tellina ; the valves closing, and having mus- 

 cular impressions in the interior, render it distinct from the 

 Lucina. 



Shell equilateral, rather elongated, almost without the 

 flexuous plait ; two cardinal teeth diverging, and two remote 

 lateral teeth, of which the anterior is but little distant from 

 the summit. 



T. Timorensis. The Tellinides of Timor. PI. 8, fig. 3. 



The only type and species of this genus. 



6. Corbis. One species. 



This genus was at first classed by Lamarck with the Lu- 

 cina ; but Cuvier, having discovered that the organization of 

 the animals differed, made this a distinct genus, which was 

 adopted by Lamarck. 



Shell transverse, equivalve, no flexuosity ; apices curved 

 inward, opposed to each other ; two primary and two lateral 

 teeth, the posterior one nearest to the hinge ; muscular im- 

 pression simple, valves sometimes convex, strongly ribbed 

 transversely, striated longitudinally, margins serrated and 

 closely interlocking. 



C.Jimhriata. The fringed Corbis. PI. 8, fig. I. 

 Species white, rather thick, oval, a little elongated, almost 



