AND OTHER FAMILIES. 221 



Cyrena TURGiDA. Plate XVIII. fis;. 53 



&• 



Test& trigond, inflate, parte antica turgidd, rugosd, inmquilaterd, transversim 

 rugatd ; valvuUs crassis ; natibus elevatis, recurvis ; deyitibus cm-dinalibus siib-bi- 

 Jidis, dente anteriore laterali brevi et elevato, jiosteriore longo et laminato ; mar- 

 garitd albd. 



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

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

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

 ellar; nacre white. 



Hab , 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 from 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. 



58 



