434 Zoological Society. 



crenulato) ; dorsali postico convexo et valde declivi; lunuld pro- 

 fundd, cordatd ; pube Icevi, excavatd; sulco radiante obtusissimo, 

 lunulam alteram, ad extremitatem anticam simulante. 

 Index Test. Sup. t. 16. f. 25. Long. 1 ; lat. 1 poll. 

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

 Not at all unlike the dysera of Chemnitz, but the concentric ribs 

 are in that species distant and membranaceous, whilst in ours they 

 are thick, obtuse, and rather crowded. 



Venus Lyra. Ven. testa rotundato-cordatd, ventricosd, valde in,' 

 cequilaterali, albidd, lineis maculisque brunneis angulatim variegatd, 

 concentrice costellatd ; costellis confertissimis Icevibus, medio sub- 

 imbricatis, antice etpostice membranaceis ; interstitiis glabris ; mar- 

 gine ventrali arcuate, intusque crenato ; lunuld cordatd, brunned, 

 profunde impressd ; pube excavatd ; superficie internd albidd. 

 Index Test. Sup. t. 16. f. 21. Long. 1-20 ; lat. 1'40 poll. 

 Hab. Gulf of Guinea (Rang). Mus. Hanley, Cuming. 

 In contour, colouring and general sculpture this rare shell ap- 

 proaches the cincta of Chemnitz (f. 387), but whilst that species is 

 girt with but a few broad belts, ours is adorned with at least forty. 

 It is sometimes called V. cingulata of Lamarck, but not only is the 

 expression " annulis crenatis" utterly at variance with its character- 

 istics, but an examination also of the typical specimens of the Jardin 

 des Plantes has proved to me its complete distinctness from that 

 species. Its teeth are those of the section Dosina. 



Venus decipiens. Ven. testa parvd, rotundatO'Subtrigond, com- 

 pressd, incequilaterali, solidd, pallide fulvd, radiis latis rufo- 

 brunneis variegatd, concentrice costatd ; costis glabris, subremotis, 

 depressis, postice sublamellosis, et supra pubem impressam por- 

 rectis ; interstitiis subconcavis, Icevibus ; margine ventrali subar- 

 cuato, intusque subcrenato ; dorsali, utrinque declivi, postice con- 

 vexo, antice brevi, subrecto ; lunuld lanceolatd ; ligamento angus- 

 tissimo, infosso. 

 Index Test. Sup. 1. 16. f. 22. Long. 0-75 ; lat. 090. 

 Hab. Australia .'' Mus. Hanley, Cuming. 



So extremely like the young of fasciata as with difficulty to be 

 distinguished. Its form, however, is proportionably broader between 

 the lateral extremities, the valves are much more compressed, and 

 the interstitial spaces decidedly broader. The hinder terminations 

 of the lamellar ribs, which project beyond the escutcheon in com- 

 pressed tubercles, do not appear to become obsolete by age, as in 

 fasciata. 



Amphidesma carnicolor. Amph. testa suborbiculari, convexd aut 

 subventricosd, subtenui, sub<jequilaterali, albido-rosed aut earned, 

 undique concentrice lamellatd ; lamellis multis, membranaceis, ad 

 margines earum serratis ; interstitiis rugis radiantibus minutis, 

 confer tissime ornatd ; margine ventrali rotundato, intusque integro; 

 dorsali, utrinque brevi, subrecto et subcequaliter declivi ; pube im- 

 pressd ; superficie internd aurantid. 



