C Y T H E R E A . 



Plate VI. 



Species 19. (Fig. «, Ij, c, llus. Cuming'.) 



C'ythere.y ovum. Ci/th. kstd ovatd, .wUdUiimd, gibbd, 

 atUice cordatd, jjodici siibproducld, albidd, epidi;r- 

 mide grised vel nfescente-aiiraulid iitdiitd, lali-re pus- 

 tico intiis e.vliisijne vio/aceo-tiiicio. 



The egg Cvtiiekea. Shell ovate, very soliil, gibbous, 

 anteriorly lieart-shaped, posteriorly a little produced, 

 whitish, coveretl with a grey or reddish-orange epi- 

 dermis, posterior side stained within and without 

 uitli violet. 



Hanle\, Pro. Zool. Soc. 1845, p. 21. 

 Mtretrix ovum, Deshayes. 



/''(/. Madras. 



A :olid, gibbons shell, varying in form, as in the spe- 

 cimens tigured, from snbglobose to oval, of a grey or red- 

 ilish-orange colour, deeply stained with violet, chiefly in 

 the iuterior, at the posterior extremity. 



Species 20. (Mus. Cm: 



■) 



CvTHEliEA LUSORIA. Cyth. testd subtrif/uuo-ovatd, soUdd, 

 s/ibaqiiilaiei'ali, alba, spadiceo-rufu nebulald etfusciatd, 

 infra epidennide pallide fulvd, Iceviyald, niUntt', area 

 Ugamenti lividd. 



The sportive Cytherea. Shell somewhat triangularly 

 ovate, solid, nearly equilateral, white, clouded and 

 banded with fawu-red, beneath a pale fulvous epi- 

 dermis, smooth, shining, ligameutary area livid. 



Merftrix lu.wria, llumiihius, Amb. pi. 43. f. G. 

 Ffiiiis liisoriii, Chemnitz. 

 Ci/thtfrea Insoria, Lauuirck. 



Hab. Ciiina Sea. 



The fawn-red, or iron-mould colouring of this species, 

 is mostly constant. 



Species 31. (Mus. Cuming.) 



Cytherea vestita. CylJi. Usld ovatd, sublrigond, ino- 

 dich df/ircs'sd, solidinsculd, fidvcuCKiile-lacttd, violaceu 

 pullide iKiiltiradiatd, cpidennida inlcuae oUvaceo-fuscd 

 indiild, coucentrice rnde str'mld, ured Ugamenti lividd. 



The clothed Cytherea. Shell ovate, slightly trian- 



gular, moderately depressed, rather solid, I'nlvous 

 cream-colour, faintly many-rayed with violet, covereil 

 with a dark olive-brown epidermis, coaceutrically 

 rudely striated, ligamenlary area livid. 

 Rab. — ^? 



I cannot refer this to any described species. Its coloiu'- 

 ing and epidermis are quite peculiar. 



Species 22. (Mus. Cuming.) 



Cytherea stultorum. Cglh. testd oblongu-uculd. lub- 

 Dotiaciforiiii, modice depressd, albido-grised, fiaven- 

 ceute-ronto pallidi fasciatd, hevigatd, uileiile, latere 

 antlco eompresne rotiiiidalu, postico exilissimi Jlexuonu- 

 aiigiilato. 



The fools' Cythekea. Shell oblong-ovate, somewhat 

 Donax-shaped, moderately depressed, whitish-grey, 

 faintly rayed with yellowish-rose, smooth, sliiniiig, 

 anterior side compressly rounded, posterior very 

 faintly flexuously angled. 



Du:iax stiilloniiii.. Gray, Wood, Ind. Test. Snpp. pi. 2. f 2. 

 Trigojia .•itnlturinu, (Jray. 



Hab. Indian Ocean. 



A very delicately tinged, shining shell, of rather com- 

 pressed growth. 



Species 23. (Mus. Cuming.) 



Cytherea bicolor. Ci/lh. tentd acute Iriguud, depresse 

 cuiieiforiiii, alba, eplderiidde pallide fated iadutd, he- 

 vigatd, Iniiuld et urea ligaiueidi peraiiiplis, plai/is, 

 ared clolaveo-caaluned. 



The tavo-coloured Cytherea. Shell sharply trian- 

 gular, depressly wedge-shaped, white, covered with a 

 pale fulvous epidermis, smooth, lunule ami liga- 

 meutary area very large, flat, aiea violet-chestnut. 



Trigoita bicolor. Gray, Anal. 1838, vol. viii. p. 304. 

 Cgtherca bicolor, llanley. 



Hub. Senegal. 



A shai-ply-angled shell, of a violet-chestnut colour on 

 the largely-expanded ligamenlary aiea, while all the re:t 

 of the shell is white. 



Januarv, ISIJ-i. 



