TELLINA. TELLEN. 1?5 



nated lateral ones, projecting above the margin ; from the 

 apex a furrow runs on the inner-side of the posterior la- 

 teral tooth, in which the connecting cartilage is fixed : color 

 yellowish-white. Inside smooth, glossy yellow : the tongue 

 or cicatrix to which the animal is affixed, is broad, and 

 I runs into the middle of the shell ; margin plain, beneath 

 which is a depressed punctured line, parallel with the outer 

 edge, not very conspicuous in younger shells. Length an 

 i inch and a quarter ; breadth something more." 



Gmelin has also observed, that the transverse striae are 

 crossed by longitudinal ribs ; that behind the beaks is a 

 very short heart-shaped depression ; and that the lateral 

 teeth are single. 



From the Dorsetshire coast. 



19. Tellina Radula. Rasp Tellen. 



Montagu, pi. 2. f. 1, 2 Wood, pi. 42. f. 4, 5. 



Venus borealis. Donovan, pi. 130. 



Shell nearly orbicular, white covered with a pale brown 

 skin, rough with close-set concentric ridges ; the posterior 

 slope indented under the beaks, with a small oblong heart- 

 shaped depression ; the cartilage margin running nearly 

 straight from the hinge, along which is a slight furrow in 

 each valve ; inside chalky white, of a clearer color round 

 the margin, where it is marked with longitudinal wrinkled 

 lines : beaks central, pointed, turning towards the posterior 

 side : hinge with two teeth in each valve, one of them 

 cloven, and without lateral ones : diameter an inch and a 

 half. 



Western coasts, Dublin bay, and Cove. v. v. 



20. Tellina fausta. Obsolete Tellen. 



Linn. Trans, viii. pi. 1. f. 8 Donovan, pi. 98 Dorset 

 Cat. pi. 5. f. 5. 



Shell nearly orbicular, somewhat compressed, semitrans- 

 parent, white, minutely and obscurely striate concentrically, 

 sloping much at the sides which give the beaks a. very pro- 

 duced appearance, with a flexure at the posterior s de from 

 the beaks to the margin : beaks small, nearly central, not 

 inclining to either side ; inside smooth, white : hinge with 

 ono of the teeth in each valve cloven ; lateral teeth strong, 



that 



