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 pinnae 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. 



Fig. 1. Sertularia tricuspidata, natural size ; a, portion of same, magnified. 

 Fig. 2. Sertularia labrata, nat. size ; a, portion of same magnified. 

 Fig. 3. Sertularia corniculata, nat. size ? a, portion of same magnified. 



Plate VII. 



Fig. 1. Pluniularia gracilis, nat. size ; a and h, portions of same, magnified. 

 Fig. 2. Plumularia struthionides, nat. size ; a, portion of stem, magnified; 



b, vesicle, magnified ; c, portion of pinna, magnified j 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 BailHe, 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 and 0. 

 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 (Labrus ber~ 

 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. 



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