AND OTHER FAMILIES. 109 



Cyrena TURGiDA. Plate XVIII. fisr. 53 



»• 



Tesid tiHgond, inflatd, parte anticu turgidd, ritgosd, msequilalerd, transversim 

 rugutd ; valvulis crassis ; nalibus elevatis, recu7'vis ; dentibiis cardiiialibits aub-bi- 

 Jidis, denie anteriore laterali brevi et elevato, posteriore longo el laminato ; mar- 

 garild albd. 



Shell triangular, inflated, swollen on the anterior part, rugose, inequilateral, trans- 

 versely wrinkled ; valves thick ; hcaks elevated, recurved ; cardinal teeth disposed to 

 be bifid ; anterior lateral tooth short and elevated ; posterior lateral tooth long and lam- 

 ellar; nacre white. 



Hab 5 India. Rev. William Carey. 



My Cabinet. 

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



Shell triangular, inflated, swollen on the anterior part, rugose, in- 

 equilateral, transversely wrinkled ; substance of the shell thick ; beaks 

 elevated, recurved ; ligament rather long and narrow; epidermis yel- 

 lowish brown, darker towards the margin ; cardinal teeth disposed to 

 be bifid ; anterior lateral tooth short and elevated, somewhat conical ; 

 posterior lateral tooth long and lamellar ; cicatrices scarcely perceptible ; 

 cavity of the shell deep and rounded ; cavity of the beaks angular ; 

 nacre white. 



Remarks. — To the kindness of Dr Carey of Calcutta 1 owe several 

 specimens of this species. In the teeth it resembles the C. Zeylanica 

 (Lamarck), and the C. papua (Lesson). It differs Jt'rom both in being 

 more triangular, more inflated, as well as in being a smaller species. 

 In the enlargement of the anterior part, which seems to be turgid or 

 swollen, it differs from any Cyrena with which I am acquainted. 

 Being without serrulate teeth, it belongs to Lamarck's second divi- 

 sion — " dents laterales entieres. 



VOL. v. — 2 c 



