5 
This beautiful species is very closely allied to the Halcyon cyanotis, 
Sw., but may at once be distinguished by the centre of the abdomen 
being white, which circumstance suggested the name. It is a shy 
bird. 
Mr. Lovell Reeve then communicated a paper by Sylvanus Han- 
ley, Esq., in which the author describes, subjoined, five new species 
of shells belonging to the genus Donaz, a group of Acephalous Mol- 
lusks. 
Donax sEmisutcaTa. Don. testa abbreviato-cuneiformi, totd albido- 
lutescente, nitidd, posticé attenuata, levigatd, margine dorsali valde 
declivi ; anticé brevissimd, truncatd, transversim sulcatd et longi- 
tudinaliter striatd ; margine anteriore subrecto; vulva decussatd, 
lateribus subangulatd ; intis margine crenulato. 
Long. 2 poll. ; lat. 3 poll. 
Hab. ? Mus. Stainforth, Metcalfe, Hanley, &c. 
A very distinctly characterized shell, which bears little resemblance 
to any other species of this genus, with the exception of the strami- 
nea of Schreetter. That rare and almost forgotten shell differs from 
ours in the following particulars. The shape is altogether more 
rounded, the ventral edge less arcuated, the edges of the anterior 
slope rounded, and its transverse striz obsolete. Moreover the 
posterior margin is entire. 
Donax puncrato-str1aTa. Don. testd subtriangulari, valde con- 
vead, pallide livido-fuscd, radiatim punctato-striatd, margine dor- 
sali utrinque valde declivi, ventrali medio arcuato ; vulva longitu- 
dinaliter argut? striatd, lateribus obtusis ; intis purpurea, margini- 
bus dentatis ; dentibus lateralibus in utrdque valvuld duabus. 
Long. # poll. ; lat. 14 poll. 
Hab. ? Mus. Stainforth, Metcalfe, Hanley, &c. 
Combining the outline of the striata of Linneus (not Chemnitz) 
with the dotted striz of denticulata, this shell may nevertheless be 
easily distinguished from either by the obtuse edge of its anterior 
slope. The inner margin is strongly dentated, excepting at the an- 
terior slope, where it is finely crenulated. I believe that it is found 
on the shores of China, but will not venture to assign it that or any 
other locality. 
Donax carinata. Don. testdé elongato-cuneiformi, antice acumi- 
natd, convexd, purpureo-fuscd, striis longitudinalibus magis mi- 
nusve distinctis ornatd (sepe politd, radiisque saturatioribus 
obsolete depictd) ; vulvd oblique truncatd, lateribus carinatd, feré 
planulatd, striisque subgranulatis radiatd ; intts purpured, denti- 
bus lateralibus in utrdque valvuld duobus, marginibus crenatis. 
Long. # poll. ; lat. 12 poll. 
Hab. ? Mus. Stainforth, Metcalfe. 
A species peculiarly characterized by the very sharp and subros- 
trated angle formed by the ventral edge with the nearly straight 
edge of the depressed and sharply carinated anterior slope. In the 
majority of specimens the striz have become obsolete and the shell 
