TELLINA. 201 



**** Shells Plano-conver. 



UNEQUAL-VALVED TELLEN. 



PL 47. /. 2, 3, 4. Mr. Sowerby. 



97. Tellina inaequivalvis. T. testa ohlongo-rostrata, valvula altera plana, 

 Linn. Syst. Nat. ed. 12. p. 1118. Linn. Gmel. p. 3233. 



Shell oblong, beaked, one valve flat. 



Chem. Conch. 6. pi. 11. f. 106. a.b. c. d. Encycloy>. Method, pi. 250. 

 (Pandora) Donov. Brit. Shells, pi. 41. f. 1. Mont. Test. Brit. p. 75. 

 Linn. Trans. 8. p. 50. Penn. Brit. Zool. 1812. 4. p. 178. 



A smooth, pellucid, milky shell, with one valve flat, 

 and the other convex ; one end is rounded, the other 

 produced into an obtuse beak ; the dorsal suture is 

 straight ; there are two teeth at the hinge, but no lateral 

 teeth. Length, (of large specimens,) three quarters of 

 an inch ; breadth an inch and a half. 



Inhabits the Mediterranean and Norwegian seas, and 

 has been admitted among the British species, by Mr. 

 Donovan, on the authority of a specimen from Guernsey. 

 Mr. Montagu suggests, in the supplement to his Bri- 

 tish Testacea, that his Solen Pinna may be the young 

 of this species ; but the figure which that naturalist 

 has given, and which is undoubtedly correct, will hardly 

 justify the conjecture. The Author has before him a 

 young T. incequivalvis, not more than a quarter of an inch 

 long, and five eighths broad, exactly proportioned like 

 the largest specimens. 



The French naturalists have constituted of this 

 shell a new genus, under the name of Pandora of 

 which this, the P. margaritacea, is the only species. 



