Description of New Serlulariadw. 149 
other. The cells are wider-mouthed and shallower. Besides 
the projecting process in front, there are about ten teeth round 
the margin instead of eight, and they are unequal instead of 
being equal ; the first two and the last two are long and slender, 
and the whole are variable in size and development. The 
vesicles are considerably larger than in P. cristata, and the 
ribs are toothed. 
When dry, this species, like P. cristata, becomes curved in 
a falcate manner, and the pinnse are frequently laid to one 
side, so that it assumes a good deal of the form of an ostrich 
plume, in reference to which I have given it the above specific 
name. 
Bay of San Francisco, 
Explanation op the Plates. 
Plate VI. 
Pig. 1. Bertularia tricuspidata^ n^iMT'dl siz^ a, portion of sarae^ magnified. 
Pig. 2. Sertularia labrata, nat. size ; a, portion of same magnified. 
Pig. 3. Sertularia corniculata, nat. size ? a, portion of same magnified. 
Plate VII. 
Pig. 1. PluDiularia gracilis, nat. size ; a and 6, portions of same, magnified. 
Pig. 2. Plumularia struthionides, nat. size ; a, portion of stem, magnified; 
b, vesicle, magnified ; c, portion of pinna, magnified ; d ande, cells, 
more highly magnified. 
(3.) Notice of Chameleon tricornis. By Mr Murray. 
Mr Murray brought under the notice of the Society some peculiarities 
of this curiously-formed species of chameleon, which had been brought from 
the interior of the Old Calabar district of West Africa, by one of the natives, 
to the Rev. Mr Baillie, by whom it was presented to Mr Murray. The male 
is characterised by three salient horny processes on the head ; the female 
has not these. Many lizards have singular spiny projections on all parts 
of the body. In allusion to the prongs on the head it had been named 
Chameleon tricornis ; but it had also two other names, C. Owenii a,nd O. 
Bibronii, the latter having been applied to the female. 
The Rev. Mr Baillie remarked, that this species was said by the natives 
to feed upon a particular kind of tree, on which it was usually found ; but 
that this was, no doubt, an error, arising from the chameleon frequenting 
this tree in consequence of its being more peculiarly the habitat of the 
insects it fed upon those around it. 
V. Dr John Alex. Smith exhibited a Ballan Wrasse (Lahrus her- 
gylta), caught in October last in Loch Fyne ; sent by Captain J. W. 
P. Orde, of Kilmory Lochgilphead, Argyleshire. It measured about 
14 inches in length, and displayed a few green spots on the hinder 
VOL. II. U 
