144 
TMLL1NA atnbigua. 
TAB. CCCCIil; 
Spec. Char. Oval-elongated convex, obscurely 
solcated ; right valve thickest, curved, and 
with only one hinge tooth. 
JJ" early twice as wide as long, rather unequalvalved ; 
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 
marginal 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- 
xnobia, (tab. 342.) but the lateral teeth and sinus in the 
impression, distinguish it from that 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 Mva plana, (tab. 76.) Pro- 
fessor Sedgwick also found it in Colwell Bay, on the 
Isle of Wight. 
