430 Prof. H. James-Clark on the Structure and 
trations and descriptions, because there are yet among zoologists 
those who suppose that there is so little in the organization of 
Protozoa that no tangible characters can be found by which 
they may be typified or assimilated in a group by themselves. — 
The taxonomic relations of the organs of the [nrusorIA FLA- 
GELLATA have received so little attention from investigators, that 
there is no small difficulty, with our present knowledge of them, 
in tracing the typical plan which is so eminently exemplified 
among the crurata. I hope I shall be pardoned, therefore, if I 
attempt to give a strict topographical view of the positions of 
the various organs of one among the most lowly of the whole 
group of animalcules. 
A considerable portion of the second volume of the great 
work of Messrs. Claparéde and Lachmann, ‘ Etudes sur les Infu- 
soires,’ &c., is occupied by a discussion of the animality of cer- 
tain doubtful forms of Monad-like Infusoria. The tests which 
these authors offer as determinatives of the zoological relations 
of the forms in question are, the possession by them of a con- 
tractile vesicle, and the introception of food. By means of either 
the one or the other of these criteria they succeed in satisfying 
themselves that the Volvocina, Astasie (Huglene included), and. 
the Dinobrya are true animals ; but in regard to other forms 
they are unable to decide. Among those which are left in the 
latter category, there is a singular infusorian which, as is usually 
supposed, was originally named Kypistylis vegetans by Ehrenberg, 
and Anthophysa Miilleri by Bory de St. Vincent. Dujardin gives 
a scarcely recognizable figure of it in the atlas of his work on 
Infusoria, but very properly places it among the monadiform 
animalcules. This is done, however, upon its general resem- 
blance to the latter (alike undetermined at that date as to their 
animal nature), and not because he had by direct observation 
decided it to bea genuine animal. The figures of Cohn (‘ Mikro- 
skopische Algen und Pilze,’ Nov. Acta Acad. Cees. Leop. 1854, 
taf. xv. figs. 1-8) are not much better than those of Dujardin. 
Habitat and general appearance.—I have been so fortunate as 
to determine the animality of Anthophysa by both of the tests 
above mentioned; and there rests not the least doubt in my 
mind that this infusorian is as truly a member of the zoological 
kingdom as any of the well-known Protozoa. I would state, 
for the information of those who are not acquainted with the 
habits of this animalcule, that it is quite common among the 
freshwater weeds. It may be most advantageously studied 
when it is attached to Myriophyllum or Ceratophyllum—a small 
piece of the tip of the filiform leaf of either (which seems to be 
covered by an irregular floccose deposit) usually affording abun- 
dant specimens. 
