Zoological Society. 6] 
March11.—Rey. John Barlow, M.A., F.R.S., Sec. R.I., in the Chair. 
A paper by Sylvanus Hanley, Esq., was read, contaming descrip- 
tions of two new species of Donar :— 
Donax assrmiuis. Don. testd cuneiformi, magis minusve crassd, 
antice compressa, postice ventricosd, valde inequilaterali, lividd, 
albo-violascente, aurantid aut flavidd, zonis saturatioribus aut vio- 
laceis plerumque pictd, radiatim striatd; striis haud confertis, 
antice simplicibus, postice elevatis et decussatis ; margine ventrali 
crenulato, haud arcuato, antic sursum acclinato; dorsali, antice 
subdeclivi subrecto aut convexiusculo, postice subrecto et valde de- 
clivi ; latere antico producto, ad extremitatem rotundato et atte- 
nuato ; postico perbrevi et inferne angulato; costd umbonali sub- 
angulatd ; pube decussatd, et costella ad extremitatem dentiferd, 
sepe radiatd ; ligamento prominente et satis magno ; superficie in- 
ternd in adultis, prope marginem violaced ; dente laterali antico 
haud remcto, postico subapproxvimato. 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 Lusricus. Don. testd cuneiformi, compressa, solidiusculd, 
valde inequilaterali, nitidissimd, lividd aut albo-violascente, antice 
levigatd, posticé striis radiantibus ornatd ; margine ventrali ex- 
iliter crenulato, convexo aut convexiusculo ; dorsali, utringue sub- 
recto, antice declivi, postice valde declivi ; latere antico attenuato, 
ad extremitatem rotundato; postico perbrevi et inferne obtuse 
angulato ; vulvd rugis confertis concentricis, strisque evilibus ra- 
diantibus, eleganter decussatd ; costé 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 Trogon, from 
South America, and seven new Birds from Australia, which he cha- 
racterized as follows :— 
Trogon PuELLA. Trog. loris, plumis auricularibus et guld fusco- 
nigris ; capite, corpore superiore, et pectore aureo-viridibus ; alis 
nigris ; tectricibus alarum maculis minimis albis ornatis ; corpore 
inferiore vivide coccineo, separato a viridi pectore fascid semilunari 
alba; tribus remigibus exterioribus nigris vittis albis angustis 
Srequentibus ornatis ; femoribus nigris. 
Lores, ear-coverts and throat dull black; head, all the upper sur- 
face and chest golden green; wings black ; the coyerts very minutely 
freckled with white, and the primaries with a very narrow line of 
