144 

 TELLiNA ambig'ua. 



TAB. CCCCIII. 



Spec. Char. Oval-elongated convex, obscurely 

 sulcated ; right valve thickest, curved, and 

 with only one hinge tooth. 



[N^EAULY twice as wide as long, rather unequal valved ; 

 the right valve is more convex, and thicker than the 

 other ; both extremities are equally rounded, and the 

 beaks are not prominent ; the remote teeth are obscure 

 in the right valve, but very prominent in the other : the 

 raaro'inal fold is very obscure, it may however, be traced 

 in the left valve ; the sulci are always deepest about the 

 sides, but are sometimes almost obliterated. 



In its general aspect, this much resembles a Psam- 

 mobia, (tab. 342.) but the lateral teeth and sinus in the 

 impression, distinguish it from (hat Genus; whether it 

 be a genuine Tellina, may remain a doubt : Brander's 

 fig. 93, may possibly be meant for it, but as it differs 

 much in form, I would not venture to refer to it. , 



Sent by several Friends from Barton Cliff", where it 

 must be common : it appears to be gregareous, and is 

 mixed with an abundance of Mya plana, (tab. 76 ) Pro- 

 fessor Sedgwick also found it in Colwell Bay, on the 

 Isle of Wight, 



