Bauhaus-Universität Weimar

Titel:
The Cyclopaedia of Anatomy and Physiology, vol. 4: Pla [corr.: Ple] - Wri
Person:
Todd, Robert Bentley
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit29465/416/
406 
ROTIFERA. 
two strap-shaped sexual glands and contrac- tionary system is indicated [by the presence of 
tile vesicles. Traces of a vascular system are eyes, which are visible in ten genera and thirty- 
seen only in a few species. The sensa- three species. 
Analysis of the genera. 
Eyes 
sent. 
Eyes 
sent. 
1 
J 
Foot furcate. 
Styliform foot. j 
One eye in. 
neck. 
Furcated foot. 
■ 
Styliform foot. 
Two eyes 
frontal. 
Furcated foot. 
Four eyes. 
Furcated foot. 
Lepadella. 
Depressed shield. 
Monostyla. 
Prismatic shield. 
Mastigocerca. 
Shield gaping be-") 
neath. 
Euchlanis. 
Shield closed be fShield horned- 
Salpina. 
neath. 1 Shield without 
1 horns. 
| Dinocharis. 
Monura. 
Shield somewhat I 
compressed or > 
prismatic. J 
Colurus. 
Shield depressed/Hooded, 
or cylindrical. /Not hooded. 
Stephanops. 
Metopidia. 
Squamella. 
In this as in the preceding family, there can 
be little doubt that the artificial character, 
the number and position of the so-called eyes, 
on which the genera are founded, separates 
species which are united by much more im¬ 
portant characters. Thus Dujardin remarks, 
that the genera Lepadella, Metopidia, Ste- 
phanops, and Squamella are separated only 
by characters which vary according to the 
nutrition of the animal and the time of the 
year. The same remark will apply to many 
of the genera of the preceding family Hyda- 
tinaea. The species of this family are found 
in both salt and fresh waters, and have a 
wide distribution over the surface of the 
earth. The genus Lepadella is developed 
sometimes in stagnant water in such quan¬ 
tities as to give it a milky appearance. 
Family 7. — Philopinæa. Character. 
Naked Rotifers with two rotatory organs. 
The body of these animals is mostly of a ten- 
uiform, cylindrical, or spindle-shape, with false 
articulations, by which, through its muscles, 
the animal is enabled to withdraw the parts 
of its body one within another, like the tube 
of a telescope. The double rotatory organ, 
so evident in Rotifers (fig. 301.), is seen in all 
the species. In every species there is a fur¬ 
cated foot. In the genera Callidina, Rotifer, 
Actinurus, and Philodina, appendicular hooks 
are found on the false articulations (fig. 295.), 
A muscular system is seen in Callidina, Acti¬ 
nurus, Rotifer, and Philodina. Three of the 
genera have two jaws with two teeth, and 
two jaws with a row of teeth. A filiform in¬ 
testine, with a vesicular enlargement at the 
end, is seen in four of the principal genera. 
Intestinal glands are seen in four genera. 
The reproductive system is hermaphrodite in 
lour genera, with an ovarium and male sexual 
glands, and contractile vesicles, The last are 
only seen in Rotifer and Philodina. These 
two genera and Actinurus sometimes produce 
living young. Traces of a vascular system in 
the transverse vessels of Rotifer and Philodina, 
and also in the respiratory tube or opening 
of these genera, and of Actinurus and Mono- 
labis, are seen. Nervous masses are found 
under the eyes. 
Fig. 295. 
Philodina roseola. (After Ehrenberg.) 
a, respiratory tube ; b, alimentary canal ; c, cel¬ 
lular mass; d, terminal intestinal pouch; e, anal 
orifice.
        

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