C Y T H E R E A . 



Plate IX. 



Species 35. (Mus. Brit.) 



Cytheiie.\ EXlI.ls. Ciilk. testa trhjono-ovatd, compivn- 

 siii-fCiilii, nd inalionnH acuta, postici stihancjulatd, altii- 

 dd, maciitm piii-piiri'o-nifis snr/ittreformitmis sjiarsim 

 notatd, epidennidf tviiui corned btdutd, IfPvigntd, ad 

 latii-H poaticum plicalo-slriatd. 



The delicate Citherea. Sliell triaiigulnrly ovate, 

 nitlipr compressed, sharp at the uuiboes, posteriorly 

 slightly angled, whitish, sparingly marlied with 

 purple-red arrow-headed spots, covered with a thin, 

 horny epidennis. suiootli, plieately striated on the 

 posterior side. 



Meretrl.v exilk, Deshayes, Cat. Conch. Brit. Mus. p. W. 



Hal,. ? 



The arrow-headed dashes, with which this species is 

 promiscuously sparingly marked, are quite peculiar. 



Species 36. (Mus. Brit.) 



(!ytherea POLITa. Cijth. le^itd siiljtrigoiiu-ovatd, snbarcu- 

 atd, not id d, tmlijiild, Candida, pnriiun-o-carnea radi- 

 atd. niti'ntc, latere postico saljanijulato, cnreato. 



The polished Cytherea. Shell somewhat triangularly 

 ovate, slightly curved, solid, smooth, white, raved 

 with purple flesh-colour, shining, posterior side 

 slightly angled, curved. 



SowERBY, Thes. Couch, vol. i. p. 61S. pi. 127. f. Ik 

 Triijona polita, Deshayes. 



Hab. Natal. 



A very delicately tinted shell, smooth and shining. 



Species 37. (Mus. Brit.) 



Cytherea ambioua. Ci/tli. testa snljtrifiono-ovatd, soli- 

 diiiscida, depressd, olbidd, piirpnreo-carneo varii ra- 

 diald, lunuld et area ligamenti aiirantio-caslaiieis, Ite- 

 vigafd, nitente. 



The doubtful Cytherea. Shell somewhat triangu- 

 larly ovate, rather solid, depressed, whitish, \'ai'ionslv 

 rayed with purple flesh-colour, lunnle and ligamen- 

 tary area orange-chestnut, smooth, shining. 



Triffona ambigua, Deshayes, Cat. Conch. ]?rit. Mus. p. 

 47. 



Hab. ? 



Very like the preceding species, although of a more 

 triangular form. The orange-chestnut colouring of the 

 luuule and ligamentary area is certainly peculiar. 



Species 38. (Mus. Brit.) 



Cytherea corpulenta. Cylh. testa snblrigono-orbicn- 

 lari, solidd, cordato-titmidd, poslici; oblnsi angulatd, 

 IfBvigatd, alba, liiieis anrantio-caslaueis andatis un- 

 dique pictd, epidermi.de teniii corned indntd, area liga- 

 menti livicld. 



The stout Cytherea. Shell somewhat triangularly or- 

 bicular, solid, cordately tumid, posteriorly obtusely 

 angled, smooth, while, painted throughout with 

 waved orange-chesttuit lines, covered with a thin, 

 horny epidermis, ligamentary area livid. 



Gray, Cat. Cyth. Anal. vol. viii. p. 303. 

 Meretrij; corpulenta, Deshayes. 



llab. ? 



Described from a single specimen in the British Mu- 

 seum, which approximates rather closely to certain va- 

 rieties of C. zonaria. 



Species 39. (Fig. a, Mus. Brit. Fig. b, ilus. Cuming.) 



Cytherea Hindsii. Cyth. testa trigond, gibbosissimd, 

 tenuiculd, ad umbones tianidd, utrinque impressd,fnl- 

 vescente-lacied, lineis aiiranlio-brmmeis acute iind/i- 

 latis conspicue concentrice fasciald, versus viarginem 

 ustnlato-brunneo plus minus tinctd, Icevigatd. 



Hinds's Cytherea. Shell triangular, very gibbous, 

 rather thai, tumid at the umboes, impressed on 

 either side, fulvous cream-colour, conspicuously con- 

 centrically banded with sharply waved orange-brown 

 lines, more or less stained with burnt-brown towards 

 the margin, smooth. 



Hanley, Pro. Zool. Soc. 18-44, p. 110. 

 Trigona Hindsii, Hanley. 



llab. Bay of Guayaquil ; Hinds. 



An excellent species, collected in the above-named lo- 

 cality by the assiduous conchologist after whom it is 

 named. 



January, 18(54. 



