THE Microscope. 951 
reptilian mouth; along the vestibular part of the peristome 
there are usually numerous clear, large corpuscles. The ciliary 
disc is also concave like the border, and raised ridge-like through 
the middle from vestibulum to opposite edge. Contractile ves- 
icle large, pulsating slowly. Endoplast long, linear, extending 
from the peristomal region down to the attenuate posterior 
third of body, more or less curved. Length of body 35 to 4 of 
an inch. 
Second or specialized or reproductive type, snake-like; 
length #; to #; of an inch; width about one-tenth of the entire 
length; width of peristome less than in the first form, but sim- 
ilar in other particulars; the clear globules about the peristo- 
mal border are rather more constant and prominent than in the 
other stage. The contractile vesicle and contents of the body 
are similar, while the cuticular surface is more distinctly marked, 
the transverse striz on the upper part of animalcule being 
quite distinct. Endoplast much lengthened, spirally disposed, 
readily changing its position in the endoplasm. 
The body is often bent in the shape of the letter S or flexed 
into a sharp angle at the middle bringing the anterior extrem- 
ity to the level of the posterior. The number of elongate zooids 
is about one to twenty of the ordinary type. 
The long, slender, brown pedicle is dichotomously and pro- 
fusely branched ; its surface finely striate lengthwise and artic- 
ulate. The height of the largest dendrecia equals ¢ of an inch. 
Scajaquda creek, Buffalo, N. Y., and Ischua creek, Franklin- 
ville, N. Y. 
I am justified, I think, in speaking of this vorticellid as a 
remarkable one. Its size equals or exceeds that of any of its 
group. The peculiar motions of its peculiar peristome, also, at 
once attract attention. The edges of the same are often bent 
over, with the disc, lip-like or folded in like shutting ones hand. 
The normal form on contraction wholly infolds the peristomal 
region becoming somewhat pyriform in outline; those of the 
second type withdraw the same but do not very much shorten 
their bodies. 
This species should be compared with Epistylis galea. It 
resembles this species in the clear posterior third; the ordinary 
animalcules agree somewhat in form although Ophidioidea 
