C Y T H E R E A . 



Plate IV. 



Species 11. (Mas. Cuiuiiig.) 



CvTilEltKA AKGEXTlNA. Cyth. tesld tflrjond, medio U- 

 midd, ad basin rotmidatd, nlr'mque snbaciimiiiatd, hp- 

 viyatd, flavescente-albd, epiderviide fithd corned in- 

 diild. 



The silvery Cytherea. Sliell tri:m;;ular, tumid ia 

 the middle, rounded at the base, somewhat acumi- 

 nated on either side, smooth, yellowisii-white, covered 

 with a fulvous horny epidermis. 



SowERBY, Pro. Zool. Soc. 1S35, p. 46. 

 Tr'iijQua arf/eiithin, Deshaves. 



lldb. Central America. 



The shell of this species is not unfrequently covered bv 

 a soft, velvety, chalk-white tissue, resembling a fungus. 



Species \i. (Mns. Cuming.) 



Cytiieeea morphixa. Cyth. ledd sublrigono-cordatd, 

 jmike actimimto-prodnctd, crassd, Iceviusculd, nilente, 

 coiiceidrici ruffom, ciiiereo-albd et aurantio-carned, 

 violaceo radialim I'mctd, prieserlim ad laliiis posticum. 



The morphine Cvtuerea. Shell somewhat triangularly 

 l:eart-shaped, posteriorly acuminately produced, thick, 

 nearly smooth, shining, concentrically rugose, ash- 

 white and orange-flesh colour, radia'tely tinged with 

 violet, especially on the posterior side. 



l.AMARCK, Anim. sans vert. vol. vi. p. 300. 

 Meretrix murphiiia, Deshaves. 



Uab. China. 



A solid delicately-coloured shell, of almost porcellanous 

 ^ui)stauce. 



Species 13. (Mus. Cuming.) 



Cytherea lyrata. Cyth. testa subtriyono-rotiindutd vel 

 oi'titd, veii/rico-id, soUdd, sordide looted, epidermide 

 tenni peUncido-comed bidiitd, ad aream liyamenti 

 Iwido-nigricaiite, traiisversim concentric^ corruyato- 

 Uruld, liris latis, obtitm, irreyidaribiis, interdnm con- 

 Jtnentibus. 



The hakp-stringed Cytherea. Shell somewhat tri- 

 angularly rounded or ovate, vcntricose, solid, dull 

 cream-colour, covered by a thin transparent horny 

 epidermis, livid-black at the ligamentaiy area, trans- 

 versely concentrically wrinkle-ridged, ridges broad, 

 obtuse, irregular, sometimes flowing together. 



Sowerby, Thes. Conch, vol. i. p. 621. pi. 129. f. 61. 

 Meretrix lyrata, Deshaves. 



Hub. Philippine Islands ; Cuming. 



A very striking species, sculptured tln-oughout with 

 irregularly confluent, obtuse, concentric rid"-es. 



Species 14. (Mus. Cuming.) 



Cytherea Formosa. Cyth. testd oblongo-ovatd, postice 

 suboblique productd, laded, pallide violaceo concentrice 

 fasciatd, castaneo ab umboiiibus remote biradiatd. 



The beautiful Cytherea. Shell oblong-ovate, poste- 

 i-iorly i-ather obliquely produced, cream-colour, con- 

 centrically banded with faint-violet, distantly two- 

 rayed from the uraboes with chestnut. 



Sowerby, Thes. Conch, vol. i. p. 650. pi 129 f 47 



Hab. ? 



As in many other species of this genus, dilfering little 

 from each other in form, the colouring is very charac- 

 teristic. 



January, 1S64. 



