190 
Bennett. Popular Science Review, January, 1869. This is 
a statement of the views of experimental heterogenists. 
On the Thalassicollidse. By G. C. Wallich, M.D. Ann. 
and Mag. Nat. Hist., February, 1869. 6 pages. — Dr. 
Wallich gives a sketch of Huxley’s observations published 
in 1851, and mentions some facts with regard to small 
specimens of Sphserozoum and Acanthrometra, which lead 
him to consider the former identical with Collosphaera. Dr. 
Wallich is not more inclined than any one else to regard the 
Thalassicollidae as intermediate forms between Sponges and 
Foraminifers. He compares the branching fibrils to those 
within the cyst of Noctiluca, but then observes that those of 
Noctiluca probably differ very much in their nature. There 
is no example of phosphorescence, says Dr. Wallich, amongst 
living animals so low in the scale as Rhizopods. Crustaceans, 
Entomostraca, Ascidians, furnish a luminous secretion, which 
Dr. Wallich could detach with a brush; and the writer has 
observed a similar secretion in the Annelid Chaelopterus. 
No Rhizopod is sufficiently organised to elaborate such a 
secretion is Dr. Wallich’s conclusion. 
Deep-Sea Protozoa. By Dr. G. C. Wallich. — In the new 
journal of the Microscopical Society, Dr. Wallich makes 
some remarks on Professor Huxley’s paper on Coccoliths 
and Bathybius ( f Quart. Journal Microscopical Science,’ Oc- 
tober, 1868). He says — “I may state that, after a careful 
and long-continued study of these organisms, whether occur- 
ring as free floating inhabitants of the surface waters of the 
Indian Ocean and tropical portion of the Atlantic, as consti- 
tuent particles in the deposits being formed at the bottom of 
existing seas, or amongst the fossil earths of the Post-tertiary 
period, I see no reason to alter my opinion by regarding the 
free Coccoliths as having been derived from any other source 
than their parent Coccospheres. In some deep-sea deposits, 
as stated by Prof. Huxley, free Coccoliths do certainly occur 
in overwhelming number as compared with Coccospheres. 
But, on the other hand, it is equally true that, at times, 
Coccospheres are present in great abundance, whereas free 
Coccoliths are, comparatively speaking, scarce. Coupling 
these facts, therefore, with another very important one, 
namely, that perfect Coccospheres are to be met with of every 
intermediate size between the y 0 ’ 0 0 th and °f an inch 
in diameter or length, I am induced to believe that the free 
Coccoliths are formed in every instance on, or pari passu 
with, the spheroidal cells on which they rest ; the state of 
attachment to these cells being the normal as well as pristine 
condition. That they revert at any future stage of their life 
