44 QUARTERLY CHRONICLE, 
“‘ On the Embryology of the Echinodermata,” in which he gives 
the results of some very careful observations, leading him to 
differ, to a certain extent, from the views of Johannes 
Miller and others. The July number contains ‘ A second 
Memoir on the Antipatharians,’ by that most diligent and 
accomplished naturalist, M. Lacaze-Duthiers; whilst the 
August number is devoted to a very valuable and extensive 
memoir “ On the Family of the Tridacnide,” by M. Léon Vail- 
lant, in which many microscopical matters concerning the 
anatomy of these molluscs are entered into. 
ENGLAND.—Annals and Magazine of Natural History.— 
In the October number of this journal is a valuable paper by 
Professor H. James Clark, read before the American Academy of 
Science and Arts, with the title “‘ Proofsof the Animal Nature of 
the Cilio-flagellate Infusoria, based upon Investigations of the 
Structure and Physiology of one of the Peridinia (Peridinium 
cypripedum, un. sp.).’’ The author commences by speaking of 
Darwinism as a resuscitation of previously advanced doctrines, 
wherein we must be allowed to remark that he appears to 
misunderstand the work which Mr. Darwin has done. The 
species of Peridinium which Professor Clark has studied differs 
from those described by Professor Allman, in the third volume 
of this Journal (1856), and for it he proposes the name cypripe- 
dum. It has an oblique, pyriform outline, more than one 
third longer than its greatest breadth, and hollowed on one 
side by a broad longitudinal depression, extending from the 
narrower end to a short distance beyond the broadest part of 
the body. Not far from the narrower end the so-called 
flagellum is attached, in the middle line of the broad depres- 
sion, and is so long as to project beyond the end near to 
which it is situated. As the narrower end is always the pos- 
terior, and the broader end the anterior, in the act of swim- 
ming, and the relations of the other parts of the body, such 
as the position of the mouth, and particularly of the cesopha- 
gus, correspond to these, the one which precedes should be 
called the anterior, and the other the posterior, end of the body. 
Two shallow furrows encircle the body; the whole of it pos- 
terior to the narrower of these furrows is clothed with vibra- 
tile cilia, but the anterior end is devoid of them, and appears 
to be covered by a low cap, in the form of the segment of a 
sphere. Close to the posterior end is the large, clear, con- 
tractile vesicle, which has hitherto escaped notice, owing, it 
is believed, to the incessant and rapid movements which the 
animal performs. 
Professor Clark manages to confine his Peridinia by strewing 
the glass slip on which the water containing the specimens 
