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processes. After lying in water for some time, the projecting 
filaments exhibited the usual characteristics of cilia, and 
would, no doubt, have been termed cilia by any naturalist. 
The structure of this membrane is so beautiful and delicate 
that it might be employed as a “test object” for ascertaining 
the defining power of object-glasses. I regard it as a peculiar 
formation, and feel quite certain that the appearances do not 
result from any modification occurring in the layer of sarcous 
matter which was immediately in contact with the body under 
consideration during its increase in size. 
Of the contents of the Entozoon- like body . — The contents of 
these spindle-shaped bags, cysts, or investments, without 
doubt, form the most important part of the mass, and are 
well worthy of the most attentive consideration. When 
examined under a low power, the matter occupying the cavity 
appears granular, and there are distinct indications of the 
mass being subdivided into smaller portions, the divisions being 
most distinct transversely (fig. 4). I do not think there are 
distinct septa, but the appearance is such as would result if 
each of a number of masses of germinal matter in the interior 
of a cavity with extensile walls were to divide and subdivide 
into numerous masses which were capable of growth and 
multiplication. The appearance is given in figs. 3 and 4. 
The entire contents of every one of these bodies I have seen 
exhibit the same characters. There is no indication of ali- 
mentary canal, ovary, secreting gland, or other organ. It is, 
therefore, only necessary to call attention to the small 
individual particles of an aggregation of which each of the 
peculiar bodies in question entirely and invariably consists. 
These particles are, for the most part, of an oval form or 
spindle-shaped. When perfectly mature, the body is curved, 
one extremity being rounded, while the other is almost sharp, 
as represented in fig. 6, b. They are flattened, and apparently 
consist of a transparent material, which exhibits here and 
there spots differing in refraction from the rest of the substance. 
These are irregularly disseminated through the mass, and give 
to it a granular appearance when it is examined by low 
powers ; but, under the influence of high magnifying powers, 
the appearance is such as to render it doubtful if, at least in all 
cases, these are actual granules distinct from the general mass. 
The bodies approximate to one another very closely in 
dimensions, but it is difficult to find two of precisely the same 
figure ; and it seems to me most probable that they change in 
form when they escape into the surrounding fluid by the 
rupture of the investing membrane or sac. In their general 
appearance these bodies so closely resemble the nuclei of 
tissues that, under low powers, one might easily be mistaken 
