Zoological Society. 61 



March 11.— Rev. John Barlow, M.A., F.R.S., Sec. R.I., in the Chair. 



A paper by Sylvanus Hanley, Esq., was read, containing descrip- 

 tions of two new species of Donax : — 



DoNAX ASsiMiLis. Dou. tcstd cuneiformi, magis minusve crassd, 

 antice compressd, postice ventricosd, valde incequilaterali, lividd, 

 albo-violascente, aurantid aut flavidd, zonis saturatioribus aut vio- 

 laceis plerumque pictd, radiatim striatd ; striis hand confertis, 

 antic^ simplicibus, postice elevatis et dccussatis ; margins ventrali 

 crenulato, hand arcuato, antice sursum acclinato ; dorsali, antice 

 subdeclivi subrecto aut convexiusculo, postic'h subrecto et valde de- 

 clivi ; latere antico producto, ad extremitatem rotundato et atte- 

 nuate ; postico perbrevi et inferne angulato ; costd umbonali sub- 

 angulatd; pube decussatd, et costelld ad extremitatem dentiferd, 

 scepe radiatd; ligamento prominente et satis magna ; superficie in- 

 terna in adultis, prope marginem violaced ; dente laterali antico 

 haud remote, postico sicbappreximato. Long. 1 ; lat. 1*55 poll. 

 Hab. Panama. Mus. Cuming, Hanley, &c. 



Very variable in colouring, often with a short purple perpendicular 

 ray upon the umbones ; sometimes with three or four pale rays on a 

 darker ground, but usually uniform and only marked when aged, with 

 the rib-like stria projecting at the margin like a tooth. This latter 

 character and the identity of its sculpture render the species liable 

 to be confused with dentiferus, but the greater tenuity and less elon- 

 gated shape of that shell is preserved even in the younger specimens. 



Donax lubricus. Don. testa cuneiformi, compressd, solidiusculd, 

 valde inaequilaterali, nitidissimd, lividd aut albo-violascente, antice 

 IcEvigatd, postice striis radiantibus ornatd ; margine ventrali ex- 

 iliter crenulato, convexo aut convexiuscule ; dorsali, utrinque sub- 

 recto, antice declivi, postice valde declivi ; latere antico attenuate, 

 ad extremitatem rotundato; postice perbrevi et inferne obtuse 

 angulato ; vulvd rugis confertis concentricis , striisque exilibus ra- 

 diantibus, eleganter decussatd ; costd umbonali subobtusd ; natibus 

 acutis ; dentibus lateralibus obsoletis. Long. 0*6 ; lat. 0*8 poll. 



Hab. .'' Mus. Cuming. 



Peculiar for uniting a smooth surface to a crenulated margin. 



March 25.— William Horton Lloyd, Esq., in the Chair. 

 Mr. Gould exhibited to the Meeting a new species of Trogen, from 

 South America, and seven new Birds from Australia, which he cha- 

 racterized as follows : — 



Trogon puella. Trog. loris, plumis auricularibus et guld fusco- 

 ?iigris ; capite, corpore superiore, et pectore aureo-viridibus ; alis 

 nigris ; tectricibus alarum maculis minimis albis ornatis ; corpore 

 inferiore vivide coccineo, separate a viridi pectore fascia semilunari 

 albd; tribus remigibus exterieribus nigris vittis albis angustis 

 frequentibus ornatis ; femoribus nigris. 

 Lores, ear-coverts and throat dull black ; head, all the upper sur- 

 face and chest golden green ; wings black ; the coverts very minutely 

 freckled with white, and the primaries with a very narrow line of 



