i62 Mr. William Wood's Ohfervatkns on the 



If the principal generic charader of a fhell reil upon 

 the formation of the hinge, it will, perhaps, be 

 difficult to find a proper place for the Tl cornea. 

 The central teeth do not perfedly agree with 

 the character of a TelUna\ and the remote teeth 

 differ fo evidently, that Da Cofta has removed this 

 (hell into the next genus, where we find it under 

 the name of Cardium Nux, 



rhalis^ Maton in the Linn, T^ranf, v. 3. p, 44. /. 13. f. 37, 38. 



Tab. XV. Fig. 13—16. 



The hinge of this fhell is formed of four teeth in each 

 valve, two at the beak and two remote. The two 

 near the beak in one valve unite to form a fmall 

 arch. One of the teeth in the other valve is 

 double, ,:^:t-^ .^^ ': 



T, rivalis is ably defcribed, and well figured, in the 

 Tranfa6lions of this Society, where the difference be- 

 tween it and the T, cornea is fufficiently pointed 

 out. 



himaculaia. Linn. Syjl, Nat. ed. GrneL i. p. 3240. Ba Coji, Br. Conch. 

 p, 213, Chemn, Conch, 6. t, 13- Jl 127. 



Tab. XV. Fig. 17, 18, 19, 

 The figure of this fhell was fent to me, unaccompanied 

 by a defcription. There appears to be a thick tooth 

 in the centre of the hinge of one valve ; and a ca- 

 vity, probably for its reception, between two teeth, 

 in the oppofite, 



fervenju^ 



