Goodalia. MOLLUSCA. MACTRAD^E. 429 



4. M. cuneata — Ovate, smooth, depressed towards the front, anterior 

 margin acute-angular.— Sower. Min. Conch, t. clx. f. 7- — In Crag. 



Gen. CXIII. GOODALLIA.— Shell triangular, equivalve 

 inequilateral, closed ; hinge with two teeth in one valve, 

 and a triangular cavity between them ; in the other valve 

 a single tooth ; a lateral simple tooth in each valve on the 

 produced side. 



453. G. triangularis. — Shell with the inner margin toothed. 



Mactra tri. Mont. Test. Brit. 99. t. iii. f. 5.— G. tri. Turt. Biv. Brit. 77. 

 t. vi. f. 14. — English and Irish coasts. 



Length 2 lines, hreadth 3 lines ; strong opake, smooth, white ; heats pro- 

 minent, ohtuse. 



454. G. minutissima. — Shell with the inner margin plain. 



Mactra min. Mont. Test. Brit. Sup. 37 — G. min. Turt. Biv. Brit. 77- 

 t. vi. f. 15 Coast of Devon and Cornwall. 



This species resembles the preceding, but the shell is not quite so angu- 

 lated, nor so long in proportion to its hreadth ; nor has it ever occurred so 

 large. 



Gen. CXIV. LEPTON.— Shell flat, nearly orbicular, equi- 

 valve inequilateral, a little open at the sides ; hinge of 

 one valve with a single tooth and a transverse linear lateral 

 one on each side of the other valve ; with a cavity in the 

 middle, and a transverse, deeply cloven, lateral tooth on 

 each side, the segments of which divaricate from the 

 beak. 



— 455. L. squamosum. — Shell punctured in a scale-like man- 

 ner. 



Solen squam. Mont. Test. Brit. 565.—-L. squam. Turt. Biv. Brit. 62. t. vi, 

 f. 1, 2, 3. 



Length -j^ths, breadth T s 3 ths of an inch ; pellucid, thin, white ; obscurely 

 wrinkled concentrically ; beak small, pointed ; inside with very fine longitu- 

 dinal strise radiating from the hinge. 



456. L. nitidum. — Shell glossy, slightly striate transversely. 



Turt. Biv. Brit. 63.. ..From corallines, in Torbay. 



Shell half the size of the last, which it resembles in shape and hinge, but 

 is of a lucid, pale, glossy horn-colour, without punctures. 



