750 Land and Fresh water Shells. [Nov. 



ratis, maculisque alternates radiantibus decoloratis picta ; dorso 

 elevato ; limbi extremitatibus emarginatis. Long. 0. 85, Lat. 0. 45 

 poll. 



From the peculiar form of the aperture of this shell, it is evidently 

 accustomed to adhere to the convex surfaces of cylindrical bodies of 

 small diameter, probably the stems of shrubs growing in the water, 

 to which the sinuous disk would exactly conform. The numerous 

 specimens in the collection all possess the same feature, which is 

 never observable in Navicella tessellata of Lamarck. The last men- 

 tioned shell I discovered adhering in abundance to piles in the 

 Hughli river under Fort William, and more rarely attached to bracks 

 in Tolly's Nullah. I have retained the name proposed for the new 

 species by Dr. J. T. Pearson. 



Acephala. 



38. Anodonta soleniformis. Testa elongatissima, postice angus- 

 tata, extremitate rotundata ; antice latiore, sub-alata, extremitate 

 oblique truncata : Natibus complanatis, inconspicuis, senectute obli- 

 teratis, decorticatis ; epidermide junioris fulvida, prater angulum 

 umbonis viridi, salcis illuc vinis impressa, setate fusca. Long. 6 

 poll. Lat. prope apicem 1. 2, Lat. prope alam 1.5 poll. 



This is a very interesting shell, being, in proportion to its length, 

 the most elongated of the genus. The pearl of the interior is bluish, 

 with a salmon tinge in old specimens, which are likewise much worn 

 on the exterior surface, and have their posterior muscular impression 

 very deeply marked, and, as it were, carious. The anterior muscular 

 impression is considerably elongated under the transverse direction. 

 With the exception of a minute species which inhabits ponds in Bun- 

 delkhand, this is the only Anodonta hitherto met with in this Presi- 

 dency. 



39. Unio cceruleus, Lea. Trans. Amer. Phil. Socy. vol. 4. 

 A compressed variety of this shell occurs in the collection. 



40. Scaphula celox. Testa elongata, tumida, lseviuscula, antice 

 angulata, inter umbonem extremitatemque anticam subito evasa ; 

 carino umbonali compresso, costula obsoleta contigua. 



Scaphula : Benson, Zoological Journal, Vol. 5, page 464-5, and 

 Gleanings in Science, Vol. 1, Plate VII, fig. 2 and 3. 



One or two examples of this rare fiuviatile genus of Arcacea which 

 I first discovered in the Jumna, and subsequently met with in the 

 river Cane, occur among the shells brought from the Eastern 

 frontier. 



