21 



April 8, 1845. 



William Horton Lloyd, Esq., in the Chair. 



A number of Australian Birds' skins, presented to the Society by 

 John Osborne Balfour, Esq., were exhibited. Two of the specimens 

 were from Moreton Bay, the others principally from Bathurst. 



Descriptions of three new species of Bivalve Shells, of the genera 

 Cytherea and Venus, by Sy Ivanus Hanley, Esq. : — 



Cytheeea Ovum. Cy. testd ovatd, solidissimd, eecuivalvi, ventri- 

 cosd, nitidd, Icevigatd, albidd, epidermide fulvd indutd ; margine 

 ventrali integro, arcuato ; dorsali, utrinųue convexiusculo et sub- 

 declivi ; latere antico rotundato ; postico obtuse subangulato, su- 

 perrie glauco-cineraceo ; natibus recte incurvatis, sapi erosis ; 

 lunuld obsoletd ; superficie internd albidd, postice livido-purpuras- 

 cente infectd ; dente postico leviter crenulato ; sinu palliari vix 

 ullo. Long. 0-90 ; lat. 1-20 poli. 



Index Tęst., sup. t. 15. f. 21. Mus. Cuming, Hanley- 



Hab. ? 



Remarkable for its peculiar solidity and the eąuality of its sides. 

 It bears a slight resemblance to the true casta of Chemnitz, but is a 

 more ovate shell. 



Venus Bkugttieri. Ven. testd ohlongd, solidiusculd, subnitidd, con- 

 vecod, valde in<equilaterali, aut pallide brunned, radiis paucis albis 

 ornatd, aut fusco-cineraced, radiis saturatioribus angustis remotis 

 interruptim pictd ; radiatim sulcatd ; suleis in medio subimbricatis, 

 utrinque subdecussatis, et postic'i in costellas (plerumgue subgra- 

 nosas) mutatis ; margine ventrali subrecto autpaulh convexiusculo ; 

 dorsali, postice vix declivi, subrecto aut convexiusculo, antice sub- 

 declivi et convexiusculo ; extremitate anticd rotundatd ; latere pos- 

 tico producto, obtuse et obligue biangulato ; margine postico magis 

 minusve convexo ; natibus curvatis et radio brevi livido postice 

 ornatis ; lunuld subobsoletd ; ligamento subinfosso ; margine cardi- 

 nali intus purpureo ; dentibus angustis, recurvis.parallelis. Long. 

 0-85; lat. 1-40 poli. 

 Index Tęst., sup. t. 15. f. 59. Mus. Cuming, Hanley. 



Hab. ? 



Belonging to the section Pullastra, and allied to decussata, but 

 easily distinguishable by its shape and peculiar sculpture. It has how- 

 ever been figured for that species in the ' Encyclopėdie Mėthodiąue,* 

 pi. 283. f. 4. 



Venus magnifica. Ven. testd suborbiculari, subcordatd, tumidd 

 aut ventricosd, solidissimd, valdi inaąuilaterali ; margines verstis 

 No. CXLVI. — Proceedings of the Zoological Society. 



