44 
M. trimucronatus, Rich., two specimens. Claws of both speci- 
mens similar, acute, curved. 
3. DescrIPTION OF A NEW species oF Anatira. By J. E. Gray, 
Esa., F.R.S. ETC. EVC. 
(See Annulosa, pl. 3. figs. 5, 6.) 
In the collection of my friend Mr. Joseph Fryer, of Whitley House, 
Northumberland, I have observed a very interesting new species of 
this genus, which was given him by Mr. Hewitson, who found it at- 
tached to a Gorgonia in Madeira. 
It is interesting as having the solid, thick, ventricose valves of 
Mr. Hinds’s genus Trilasmis, and it also resembles that genus in the 
anterior basal and the upper opercular valves being very small, so 
that it forms the passage between Pentalasmis and that genus. 
There are in Mr. Fryer’s collection two specimens, which differ 
considerably from one another. One jis pale red and elongate-ovate, 
smooth, rather compressed, and the larger opercular valves have a 
rather distinct line towards the extremity. The anterior basal valve 
is much-compressed. ‘The second is yellowish white, pink at the 
base, ovate, swollen, slightly radiately and concentrically striated ; 
the left larger opercular valve is larger than the right one, more 
convex, and partly inclosing it; the anterior valve and upper oper- 
cular valve are very narrow. 
I propose to call the species Anatifa crassa. Peduncle short ; valves 
thick, opake, convex, large, the anterior basal valve and upper oper- 
cular valves very narrow. 
Inhab. Madeira, on Gorgonia. 
4. On THALIELLA, A NEW GENUS OF CIRRIPEDES ALLIED TO SCAL- 
peLLUM. By J. E. Gray, Esa., F.R.S. erc. 
THALIELLA. 
Valves 11 ; opercular valves subtriangular ; dorsal elongate, curved; 
lower dorsal and anterior compressed, with two pairs of lateral valves 
in the middle of the body above the base. Peduncle with rings of 
imbricate horny scales. 
This genus chiefly differs from Scalpellum in the front and hinder 
lateral pair of valves being each united into a single compressed valve, 
and in havirg no middle basal lateral valve. 
This genus was shown to me by Mr. J. 8. Bowerbank, who re- 
ceived it from Algoa Bay attached to some species of Plumaria. 
THALIELLA ORNATA. 
Pale horn-coloured, varied with red spots, or with a single red band 
on each side; valves horny, subpellucid, radiately striated. 
On Plumaria, Algoa Bay, Cape of Good Hope. Presented to the 
British Museum by J. S. Bowerbank, Esq. 
Stroem (Nym. Saml. Danske, 1788, 295, n. 111, f. 20) described 
a Lepas testd compressd 7-valvis stipite lamellosd, found on Gorgonia 
placomus in the North Sea, which is probably allied to this genus. 
“ 
