Zoological Society. 135 



lunuldque lanceolatd, colore tinctis saturatiore ; pube albd, strigis 

 flexuosis litteratd ; superficie internd albidd, radio f usee -purpurea 

 obliquo, sub umbonibus ornatd ; margine integro, Long. 0'80 ; 

 lat. 1-20 poll. 



Hab. Van Diemen's Land. Mus. Metcalfe. 



Easily to be distinguished from those allied to it in form by its 

 internal ray. The hinge is that of the section Chione. 



Cytherea cor. C. testd cordato-trigond, intus extusque albd, con- 

 vexiusculd, undique concentrice striata ; striis exilibus, regularibus, 

 confertissimis ; latere postico majore, subcuneiformi ; margine 

 Ugamentali valde declivi, convexiusculo ; ventrali subarcuato ; nati- 

 bus acutis ; lunuld oblongd, impressd ; margine interna integra. 

 Long. 0-80; lat. 1 poll. 



Index Test. Sup. t. 15. f. 7. 



Hab. Africa. Mus. Metcalfe. 



Not unlike the Venus variabilis of Sowerby in shape and general 

 appearance. The epidermis is of that white velvety texture which 

 we meet with in argentea. 



Cytherea Hindsii. C testd trigond, ventricosd, solidiusculd, Ice- 

 vigatd, nitidd, subcequilaterali, albidd, brunneo nebulosd, utrinque 

 ohtusd ; latere antico paululilm majore ; natibus incurvatis, pallidis ; 

 lunuld magnd, subinconspicud, omninh pallidd ; pube fusco sti'i- 

 gatd; superficie internd albidd; margine integro. Long. 1 ; lat. 

 1 poll. 



Index Test. Sup. t. 15. f. 35. 



Hab. Guayaquil. Mus. Cuming, Hanley. 



This and the succeeding species belong to the subgenus Trigona, 

 and are easily distinguished from the Mactroides of Born and Chem- 

 nitz by the absence of a purple stain upon the umbones. 



Sept. 10. — William Horton Lloyd, Esq., in the Chair. 

 " Descriptions of six new species of Valuta," by G. B. Sowerby, 

 Esq. :— 



VoLUTA MAMMILLA, Gray. Vol. testd avato-oblongd, tenui, lutes- 

 cente, apice mammillari, abtus'issima , subspirali ; anfractibus 

 duobus, ultimo magna, avali, maculis lineisque castanets picta ; 

 aperturd magnd; calumelld plicis tribus. 

 Shell ovate-oblong, thin, brownish-yellow, with a mammillary, 

 subspiral, very obtuse apex ; volutions two, the last of which is large, 

 oval, marked with chestnut-coloured spots and zigzag lines; aper- 

 ture large ; columella with three folds. 



From New Holland ; a single specimen, which appears to be only 

 a very young shell, is in the British Museum. This is a very re- 

 markable species, forming the link that unites Cymba with Mela, the 

 apex of this species being subspiral, while in Cymba the apex is 

 amorphous. 



VoLUTA PIPERITA. Vol. testd obovatd, ventricosiusculd, cj'assius- 

 culd, pallescente, quinquefasciatd, fasciis posticd mediand et an- 

 ticd brunneo -puncticulatis, strigisque fuscis irregularibus arnatis ; 



