Zoological Society. 135 



lunuldque lanceolatii, colore tinctis saturatiore ; pube alhd, strigis 

 flexuosis litterafd ; sitperjicie intermi alhidd, radio fiiscn-purpureo 

 obliijuo, sub uiubonibus ornald ; marcjine i/itegro. Long. 080 ; 

 lat. 1-20 poll. 



Hnb. Van Diemen's I.ian(l. Mus. Metcalfe. 



Easily to be distiniruished 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 alba, con- 

 vexiusculd, undique concentrice striata ; striis exilibns, regitlaribus , 

 con/ertisslmis ; latere postico majore, siibcunei/ormi ; inctrgine 

 ligatnentali valde derlivi, co/ivcxiusciilo ; ventrali subarcuuto ; nati- 

 bus acutis ; lunuhl oblongd, impressd ; margine interno integro. 

 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, suba'qiiilaterali, albidd, brinmeo nebulosd, uirinque 

 ohtusd ; latere antico pauhilum majore ; nutibus iucurvatis, pallidis; 

 lunula magnd, subinconspicud, oninino puUidd; pube fusco stri- 

 gatd ; superjicie 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 P])ecies belong to the subgenus Trigona, 

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

 nitz by the absence of a purjjle 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 ovato-oblongd, tenui, lutes- 

 cente, apice maminillari, obtusissimo, subspirali ; anfractibus 

 duobus, ultimo magno, ovali, 7naculis lineisque castaneis picto ; 

 aperturd magnd; columella plieis tribus. 

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

 subspiral, very obtuse aj)ex ; 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 Hnk that unites Cymba with Melo, the 

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

 amorphous. 



VoLUTA PIPERITA. Vol. tcstd obovotd, vcntricosiusculd, crassius- 

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

 tied brunneo-punctindatis, strigisqne fuscis irregularibus ornatis ; 



