AND DESCRIPTIONS OF NEW SPECIES. 109 



Remarks. — This interesting little shell is from the fine collection 

 made by Dr Burrough during his travels in India, and 1 am indebted 

 to his kindness for the specimen figured. It is a perfectly distinct 

 species, and may easily be recognised by its form, its pellncidness, and 

 its smooth olive-coloured epidermis. It somewhat resembles a young 

 Anodonta on the exterior, but the elevated lamelliform teeth easily 

 distinguish it from that genus. Its resemblance to a Spanish olive 

 is very striking. 



Unio Pyramid at us. Plate XVI. fig. 39. 



Testa sub-pyramidata, longitudinali, inflata; valvulis antice crassioribus; nati- 

 hus maxime prominentibus, recurvis; dentibus cardinalibus magnis crenalisque; 

 kUeralibus longis, a cardinalibus separatis, ad baseos marginem vergentibusque; 

 margaritil colorem carnis habente. 



Shell sub-pyiamidal, longitudinal, inflated; valves thick anteriorly, thinner pos- 

 teriorly ; beaks very much elevated, recurved ; cardinal teeth large and crenate ; 

 lateral teeth long, distinct from the cardinal teeth and pointing towards basal mar- 

 gin ; nacre flesh colour. 



Hab. Ohio, T. G. Lea. 



My Cabinet. 

 Cabinet of the Academy of Natural Sciences of Philadelphia. 

 Cabinet of P. H. Nicklin. 

 Unio undatiis? Barnes, Var. a. 

 Diam. 1-7, Length 2-3, Breadth 2-1 inches. 



Shell sub-pyramidal, longitudinal, inequilateral, anterior part swol- 

 len recurvely from the beaks to the basal margin, compressed at pos- 

 terior margin, slightly depressed anterior to umbonial slope ; substance 

 of the shell very thick in the region of the teeth and beaks, thin at 

 posterior margin ; beaks very much elevated, recurved and incurved ; 

 epidermis very dark brown and finely wrinkled ; cardinal teeth large, 

 crenate and deeply impressed in the left valve, single and emerging 

 from a pit in the right ; lateral teeth long, slightly curved, distinct 

 Vol. IV.— 2 C 



