BIVALVE SHELLS. 135 



Venus cancellata, Lamk. An. s. Vert. v. 588. no. 12. 



Desh. Encycl. Meth. Vers, iii. 1115. no. 12 ; in Lamk. ed. 2. 

 vi. 341. no. 12. 



Turt. Dithyr. Brit. p. 144. pl. 10. f. 3. 



Mont. Test. Brit. Suppl. p. 40. 



Flem. Brit. An. p. 44/. 



Reeve, Gonck. Syst. ii. pl. 68. f. 2. 



Hanley, Descr. Cat. p. 112. 



Sow. Conch. Man. f. 119. 



Forbes ^ Hanley, MoU. Brit. i. 425. 



Conrad, Shells of Tampa Bay, Sill. Journ. ser. 2. ii. 395. 



Sow.jun. Thes. Conch. p. 710. pl. 54. f. 28-31. 

 Venus cingenda, Dilho. Cat. i. 161. no. 6. 



Wood, Ind. Test. pl. 7- f. 6. 

 Hab. Mare Antillarum ; Brasiliense. 



47. Chione Nuttallii. B.M. 

 C. testa ovato-trigona, turgida, subcordiformi, solida, insequila- 



terali, longitudinaliter radiatim costata, transversim rugoso- 

 plicata, squalide fusco-castanea, antice brevi obtusa, postice 

 obtuse angulata ; umbonibus tumidis ; sulcis longitudinalibus 

 planis, rugis transversalibus subnodosis ; valvis intus albis, 

 postice violaceis. 



Venus Nuttalli, Conrad, Journ. Phil. vii. pl. 19. f. 15. 



Hanley, Descr. Cat. p. 113; in Wood, Suppl. pl. 16. f. 46. 



Hab. Mare Californiense. 



48. Chione callosa. 



C. testa ponderosa, oblique cordata, subovali, ventricosa, albo- 

 grisea, postice fusca, intus postice purpurea ; costellis radian- 

 tibus, striatis, planulatis et costellis concentricis interruptis 

 irregulariter squamosis antice et medio decussata, postice pla- 

 nata, prope marginem divaricatim striata ; latere postico sub- 

 rostrato, margine dorsali declivi, paululum depresso; latere 

 antico brevi, rotundato; lunula vix distincta, margine ven- 

 trali rotundato, prope angulum posticum paululum emarginato. 



Venus callosa, Conrad, Journ. Acad. Nat. Sc. vii. 252. 

 Sow.jun. Thes. Conch. p. 712. pl. 154. f. 44, 45. 



Hab. Insulae Sandwichienses ; California. 



An eadem vel var. Venus Nuttalli, Conrad, loc. cit. ? 



49. Chione fluctifraga. 



C. testa ponderosa, suboblique rotundata, alba, concentrice pur- 



