BIVALVE SHELLS. 119 



tico longiore ; margines tenue crenulati ; ligamentum externum 

 angustum ; impressio pallii sinu postico fere nullo vel brevissimo 

 et triangulari terminata. 



Pectunculus, Lister (1685), Conch. pl. 282, &c. 



Petiver (1711), Gazoph. pl. 75. 



Da Costa (1778), Conch. Brit. p. 191, &c. 

 Venus (spec), Linn. (1758) Syst. Nat. ed. 10 j (1767) ed. 12. 

 p. 1128. 



Chemnitz, Schroter, Gmelin, Dillwyn, Lamarck, Sfc. 

 Callista et Callistoderma (spec), Poli (1795), Test. Sicil. ii. 

 Chione, Megerle (1811), Entw. p. 51 (non Gray, 1838). 



Gray (1847), Proc. Zool. Soc. p. 183. 

 Antigone, Schumacher (1817), Essai d'une Class. p. 154, 

 Ortygia, Brown (1827), Test. Brit. 

 Timoclea, Leach (1819), MS. teste Gray. 



Synopsis Specierum. 

 l. Species lamellosae. 



a. LamellcB membranacece, 1-13. 



b. Lamellce breviores, crassiores, 14-20. 



c. Lamellce crassissimce, 21-28. 

 II. Species cancellatse. 



a. TrigoncB, 29-51. 



b. Ovatce, cordiformes, 52-56. 



III. Species decussatse, 57-72. 



IV. Species transversim striatse, 73-92. 

 V. Species Isevigatae, 93-108. 



Species incertce, 109-129. 



I. Species lamellosce. 



a. Lamellce memhranacece. 



1. Chione lamellata. B.M. 



C. testa ovali, antice angulata, albida; lamellis transversis, di- 

 stantibus, antice appendiculatis, latere superiore striatis. 



Venus lamellata, Lamk. An. s. Vert. ed. 2. vi. 349. no. 28. 

 Reeve, Conch. Syst. pl. 68. f. 3. 

 Deless. Rec de Coq. pl. 10. f. 6, a, b. 

 Hanley, Descr. Cat. p. 119. 



