58 Zoological Society. 
a hybrid nor a distinct species, but merely an immature male of the 
Tetrao Urogallus or Capereailzie, founding his opinion on the ap- 
pearance of the Tetrao medius immediately after the re-introduction 
of the Capercailzie into Scotland by the Earl of Breadalbane, and on 
the fact, that no two species of a genus, however similar they may 
be in appearance, pair voluntarily while in a state of nature. 
February 25.—R, C. Griffith, Esq., in the Chair. 
‘* Descriptions of six new species of Donaz, in the collection of 
Hugh Cuming, Esq. (Corr. Memb.),” by Sylvanus Hanley, Esq. 
Donax Ticaonicus. Don. testd cuneiformi, convexd, nitidissimd, 
solidd, obliqua, laevigata, maxime inequilaterali, albidd, aut livido- 
purpurascente, concolore, epidermide flavescente indutd ; margine 
ventrali integro, magis minusve convexo; dorsali, antice declivi et 
subrecto aut subretuso, postice subrecto et subitd declivi; extre- 
mitate lateris antici producti, attenuatd, rotundatd ; latere postico 
brevissimo, truncato et inferne obtuse angulato ; pube concentrice 
et profunde rugosd ; natibus acutis, prominentibus ; superficie in- 
ternd aut violaced aut albidd violaced postice fucatd; dente late- 
rali antico remoto, postico approximato. Long. 1*; lat. 1°50 poll. 
Hab. 'Ticao, Philippines (Cuming). 
Remarkable for its obliquity and the abrupt truncation of the pos- 
terior side. 
Donax cuLTEeR. Don. testd elongatd, angustd, convexd, satis inequi- 
laterali, nitidd, striulis exilibus confertim radiatd, variis coloribus 
pictd (plerumque purpured, sed etiam flavd lineis purpureo-brun- 
neis radiata, albidd radiis violaceis aut lividis, aurantid et rosed, 
sepe radiis albidis ornatd) ; margine ventral crenulato, antice sub- 
recto, postice convexo; dorsali antice recto et viv paululim de- 
clivi, postice convexo satisque declivi ; latere antico producto, ad 
extremitatem obtuse rotundato ; postico rotundato-cuneiformi ; lu- 
nuld ligamentoque angustis ; pube striis simplicibus radiatd ; costd 
umbonali obtusissima ; dentibus lateralibus haud remotis. 
Var. a. Testd subinequilaterali ; margine ventrali medio subposticé 
retuso; dente laterali antico, plerumque magis approximato. 
Var. 6. Testd minus elongatd et magis inequilaterali ; margine ven- 
trali raro retuso ; dente laterali antico plerumque magis remoto. 
Long. 0°50; lat. 1°50. 
Hab. Var. a. Matzellan, Gulf of California (Cuming). 
Var. b, Acapulco (Cuming). 
Rather a common shell, and closely allied to pulchella. 
Donax aspeR. Don. testa trigond, ventricosd, solidd, subinequilate- 
rali, albidd aut carned, anticé nitidiusculd et radiatim striatd, pos- 
tice impoliid et radiaiim costellatd ; striis exilibus et simplicibus; 
costellis parvis, decussatis, aut subsquamosis aut subgranosis, supra 
costam umbonalem angulatam confertis ; margine ventrali crenato, 
arcuato ; dorsali antico, valde declivi, subrecto ; postico retuso, 
inermi, subitoque declivi: extremitate lateris antici longioris, ro- 
tundatd, posticd angulatd ; natibus valde prominentibus et maxime 
