152 QUARTERLY CHRONICLE. 
Filippi—tIn his travels in Georgia and Persia the author 
observed this lizard, which he found to be herbivorous, and 
to have the power of changing colour under the influence of 
light, like the chamelion, but to a less degree. The causes of 
change of colour do not appear to be the same; and, more- 
over, this lizard turns pale under conditions which cause the 
chamelion to turn dark. There are two layers of pigment 
observed by M. de Filippi in the skin of Stellio—a superficial 
yellowish-white layer, and a deeper-seated black pigment. 
He believes that the change of colour is caused by the injec- 
tion of the black pigment into processes of the pigment- 
cells, which pass through the yellow layer and come to view 
on the surface. The turgescence of a vascular glomerule is 
assigned as the cause of this injection of pigment. This 
structure, it is obvious, differs sufficiently ftom that described 
in the skin of the chameleon, and from the chromatophores of 
Cephalopoda, with which the author contrasts it. 
‘On two Hydrozoa of the Mediterranean.”—The same 
author has published some important remarks on the genus 
Eleutheria, and a new genius, Halybothys, which he has 
observed in the Mediterranean. 
AMERICA. — Silliman’s Journal. November, 1866. — 
“© On the Animality of the Ciliated Sponges and their Affinity 
with the Infusoria flagellata,” by Professor H. James Clark. 
—In this paper Professor Clark gives a brief notice of his 
views on this subject, which will be more fully explained and 
illustrated in the ‘ Memoirs of the Boston Society of Natural 
History.’ He describes, firstly, the Monas termo of Ehrenberg, 
with its flagellum, upper lip, mouth, and contractile vesicle, 
and he maintains that it ought to be regarded as a perfect 
animal. He then describes a remarkable genus, Codosiga 
(one of several new genera he has observed), which has all 
the appearance and structure of a Monas attached by a con- 
tractile band or stem to a hollow bell or calyx. Four or five 
of these are sometimes found attached to a common trunk by 
their narrow posterior ends. This form the author considers 
as linking Monas to the ciliated sponges. He describes 
Grantia botryoides as a tubular structure, in the glairy sub- 
stance of which are imbedded and packed together a stratum 
of monads, identical almost with those of Codosiga, the only 
difference between individuals of the two genera being that 
the one has a calyx to which it is attached, the other a spicu- 
liferous envelope. He therefore feels warranted in assuming 
that the whole group of Spongie ciliate is as intimately 
allied with the monociliate Infusoria flagellata as it is possible 
for it to be without constituting with the latter a uniform 
family. 
