BIVALVE SHELLS. 



49 



Cvtherea compressa, Sow. Thes. Conch. p, 616. pl. 123. f. 33, ol. 

 Ti-igona radiata, Gray, 1838, Cat. Cyth. Anal. t. viii. p. 305 (non 



Sow. 1835). 

 Cytherea stultorum? Phil. Abbild. Conch. t. ii. p. 180. pl. 5. f. 3. 



(non Gray). 



Hab. Caput Bonse Spei (teste Sow.) ; Columbia (teste 

 Philippi). 



11. Trigoxa bicolor. B.M. 

 T. testa trigona, angulata, alba, post angulum castanea, alta, 



compressa ; lateribus et margine ventrali rectis ; latere pos- 

 tico subelongato, acutiusculo ; lunula elongata, distincta ; ura- 

 bonibus acutis. 



Trigona bicolor, Gray, in Analyst, 1838, t. viii. p. 304.^ 

 C^^therea bicolor, Hanley, Descr. Cat. p. 104. 

 Wood, 2nd Suppl. pl. 15. f. 16. 

 Sow. Thes. Conch. p. 617. pl. 127. f. 10, 11. 

 Hab. Mare Senegalense. 



12. Trigona dolabella. 



T. testa trigona, solida, alta, pallida, Irevigata, epidermide fusco 

 induta; latere postico augulato, subexcavato, ad basin sub- 

 rostrato ; latere antico rotundato ; lunula parva, distincta ; 

 margine venirali subarcuato, umbonibus acutis. 



Cytherea dolabella, Sow. Thes. Conch. p. 619. pl. 127. f. 19. 



Hab. Mare Rubrum. 



III. Testa turgida, cardine quinque- vel sex-dentato. 



13. Trigona intermedia. 



T. testa ovali-subtrigona, alba, subaequilaterali, Isevi, compressa; 

 margine ventrali rectiusculo ; latere postico subangulato ; um- 

 bonibus parvis, oppositis ; lunula magna, ovata, vix delineata, 

 in medio convexiuscula. 



Cytherea intermedia, Sow. Thes. Conch. p. 619. pl. 128. f. 39. 



Hab. Mare Californiense. 



14. Trigona Dillwyni. 



T. testa ovali-trigona, compressiuscula, subsequilaterali ; latere 

 antico rotundato, postico obtuse subangulato, Isevigata, pallide 

 flava vel alba, rufo inaequaliter radiata ; umbonibus parvis, an- 

 gustis, oppositis ; lunula magna, regulariter ovali, plana, in 



3 



