C Y T II E R E A. 



Plate VIIL 



Species 30. (Mas. Cuming.) 



Cytherea VIIIGINEA. Cijlli. lestd ohloiigu-ovatu, late tri- 

 gond, sulaquilateraU, crassiusciild, cinerascente-alhu, 

 obscure radiatS, lavigatd vel concentrici rugosd, latere 

 postieo subquadratimjiexuoso-rostrato. 



The virgin Cytherea. Shell oblong-ovate, widely tri- 

 angular, nearly equilateral, rather thick, ash-vvhitc, 

 obscurely rayed, smooth, or concentrically rugose, 

 posterior side somewhat squarely flexuously beaked. 



Adams and Eeeve, Moll. Voy. Saraarang, p. 78. pi. 24. 

 f. 10. 



Hab. Moluccas. 



A very characteristic species, in whieli the posterior side 

 is flexuously beaked. 



Species 31. (Mus. Cuming.) 



Cytherea intermedia. Cgtli. testa late ovatd, versus 

 iimbones trigonii, nlbidd, violncm interdnm pallidi ra- 

 diatd, epidermide fidvd partim indutd, soUdd, lavi- 

 gnid, concentrice rugosd, latere postieo snbtnincato. 



The intermediate Cytherea. Shell broadly ovate, 

 triangular towards the umboes, whitish, sometimes 

 faintly rayed with violet, partially covered with a 

 fidvous epidermis, solid, smooth, concentrically ru- 

 gose, posterior side sometimes truncated. 



SowERBY, Thes. Conch, vol. i. p. 613. pi. 128. f. 39. 

 Trigona iiitenuediu, Deshayes. 



Hab. California. 



Of a somewhat truucately wedge-shaped form, faintly 

 rayed with violet upon a dull cream-coloured ground. 



Species 32. (Mus. Cuming.) 



Cytherea compressa. CgtJi. testa late ovatd, trigona, 

 siihcornpressd, fiilvescente-lacted, fasciis rvheseentibiis 

 plus minus profuse radiatd, concentrice dense striata, 

 subsericed, latere postieo subtruucato. 



The compressed Cytherea. Shell broadly ovate, tri- 

 angular, rather compressed, fulvous cream-colour, 

 more or less profusely rayed with reddish bands, con- 

 centrically closely sti'iated, rather silky, posterior 

 side slightly truncated. 



SowERBY, Thes. Conch, vol. i. p. 01(3. pi. 138. f. 33, 34. 

 Trigona compressa, Deshayes. 



Hah. Cape of Good Hope. 



This aiul the remaining species of the jtlate are charac- 



terized by an unusually broadly ovate-triangular form, all 

 more or less compressed in growth. 



Species 33. (Fig. a, b, Mus. Cuming.) 



Cytherea undulata. Cytli. testa late ovatd, snbieqni- 

 laterali, versus nmhon.es acute trigona, plauo-com- 

 pressd, falvescente-lacted, violaceo-rubenie plus minus 

 radiatd, radiis interdum interrupte undulatis, lieei- 

 gald, concentrice dense striata, ad latus anticum pli- 

 cato-corrugatd, latere postieo suhahrnpte uhbreviatn. 



The waved Cytherea. Shell broadly ovate, nearly 

 equilateral, sharply triangidar towards the luiiboes, 

 flatly compressed, fulvous cream-colour, move or less 

 rayed with violet-red, rays sometimes interrupteilly 

 waved, smooth, concentrically closely striated, pli- 

 cately wrinkled on the anterior side, posterior side 

 rather abruptly shortened. 



SowERBY, Thes. Conch, vol. i. p. 018. pi. 27. f. 13. 

 Trigona undnlata, Deshayes. 



Hah. Columbia. 



It will be seen by the variety given at Fig. 33 b that 



the interruptedly waved rays after which the C. undnlata 



is named, is by no means a constant character of tlie 



species. 



Species 34. (Fig. a, b, Mus. Cuming.) 



Cytherea planulata. Cytli. testa late ovatd, triguno- 

 cuneiformi, subaquilaterali, plano-compressd, fulves- 

 cente laded, violaceo-rnbente vurie radiatd, epider- 

 mide corned oVwaced interdum indutd, concentrice 

 densii striata, ad talus anticum sape plicato-corrugatd, 

 latere postieo suhahrnpte ahbreviato. 



The flat Cytherea. Shell broadly ovate, triangularly 

 wedge-shaped, nearly equilateral, flatly compressed, 

 fulvous cream-colour, variously rayed with violet-red, 

 sometimes covered with an olive horny epidermis, 

 concentrically closely ;>triateil, often plicatcly wrin- 

 kled on the anterior siile, posterior side rather ab- 

 ruptly shortened. 



Broderip and Sowerby, Zool. Journ. vol. .5. p. 48. 

 Bonax Lessoni, Deshayes. 

 Trigona planulata. Gray. 

 Venus planulata, D'Orbigny. 



Hab. Central America. 



This and the preceding species run so closely into each 

 other that with a variety of sjiecimens it is scarcely pos- 

 sible to define them. 



Jainiary, 1S64. 



