146 ‘THE AMERICAN MONTHLY [Angust, 
V. guadrangularis S. K., and V. spectabzlis S. K., but is readily dis- 
tinguishable from both. In its contracted state it is easily separable from V. 
spectabzlis, the latter then being subspherical, and without the posterior an- 
nulations of V. conzca. From V. guadrangularis it is separated by the 
absence of the subcylindrical body, and the anterior and posterior projecting 
angles of the latter, the small angular elevation encircling the rear pe of 
V. contca being unrepresented i in the frontal region. 
The form here referred to seems much less timid than the majority of Vor- 
ticella, seldom contracting the body or throwing the pedicle into the usual. 
spiral Suille. as ‘the cover-glass may be repeatedly and somewhat violently 
disturbed Sihouek in any way altering the expanded animalcule. This might 
be anticipated by reason of the supporting host’s activity, the Cyclops leap- 
ing through the water by rapid and often long- -continued movements, neces- 
sarily dragging the Vorticella with it. In addition to the six or eight 
Pdi duals or Vv. contca attached to one particular Cyclops, the Entomos- 
tracan was also loaded with a profusion of Podophyra fixa (Mill), 5. K., 
actively producing and extruding their free-swimming embryos. 
LE pistylis tincta, sp. nov. 
Bodies conical campanulate, less than twice as long as broad, soft and 
flexible, widest anteriorly, the posterior extremity tapering to the pedicle; 
surface transversely striate ; ; peristome border revolute; ciliary disc not ele- 
vated, ciliary circles six or more, the cilia comparatively short ; zooids yel- 
lowish i in color; pedicle profusely and dichotomously branched: the ultimate 
divisions nearly three times as long as the bodies ; contracted zooids subpyri- 
form; nucleus hand-like, curved, ‘transversely placed in the anterior body- 
half. Length of body ;4, inch; expanded colonies often ;'> inch in height 
by 4 -in diameter. Primary pedicle variable in length. Hab.—Pond water 
in early spring. Attached to various submerged objects. , 
This resembles F. flavicans somewhat closely in the form of the zooids, 
in their color, and in the profusely and dichotomously branching pedicle, but 
it differs widely in the shape of the contracted bodies, and in the length of 
the ultimate branches of the foot-stalk. The contracted zooids of 2. fave- 
cams are subspherical, i in £. ¢encta they are pyriform, and in the latter the 
ultimate divisions of the pedicle are more than twice as long as the expanded 
bodies, while in 4. flavzcans the bodies are more than fice as long as tlie 
final divisions of the foot-stalk. In the present form the pedicle is stout, 
thick- walled, and hollow. Inthe numerous colonies examined the length on 
the primary portion has never exceeded twice that of the expanded zooid. 
Near the posterior extremity of a majority of the animalcules is a closely- 
packed Ss or layer of problematical bodies, small in size, measuring 
only about 3,55 inch in length by about one-half that in greatest width and 
more or less obovate in form. They are refractive and apparently crystalline. 
The cluster is composed of usually but one layer of these closely approxim- 
ated little objects, each layer being formed of many of these closely contigu- 
ous and apparently crystalline nodules: the entire collection seeming to ine 
concavo-convex, the convexity being directed posteriorly. The layer is lo- 
cated at about one-fifth the entire length of the extended zooid from the poste- 
rior extremity, extending almost completely across this part of the body, 
acting apparently as a partition- -wall between the two regions, the endoplasm 
in pieanice being ordinarily crowded with granular, subspherical food-masses, 
while posteriorly the body substance is, as a rule, clear, semi-transparent and 
tinged only by the pale, diffused color of the animalcule. These crystal- 
line bodies, however, are not invariably present. They often occur in 
young colonies composed of but two zooids, while in other and older zoo- 
dendria formed of many animalcules, they may be absent. They may also 
