306 NOTES ON SOME CANADIAN INFUSORIA. 
forms described as belonging to the genus. It was originated by 
Dujardin for the reception of S. rugosa, and Perty described another 
form as S. patula. Lachmann,’ however, disputes both these identi- 
fications, regarding the forms as being merely recently attached im- 
mature Vorticelle, and admits to the genus only two forms discovered 
by himself, viz.: S. limacina attached to small Planorbis, and 
S. physarum attached to Physa fontinalis. Kent, in his Manual of 
Infusoria, refers two other forms to this genus. Fromentel described 
a form as S. rugosa, from which, however, it differed in possessing 
three contractile vesicles, and a very short footstalk ; this Kent 
terms S. Fromentelli. 1)’ Udekem’s Gerda inclinans he also places 
in this genus, the discoverer being somewhat undecided where it be- 
longed, having described it as belonging to the closely allied genus 
Gerda, while expressing a doubt whether it might not be referred to 
Dujardin’s Scyphidia, or to an immature form of his own Epistylis 
tubificis. The form JT had under observation (Pl. Fig. 2.) presented 
a very close resemblance to this, differing, however, in some points 
from Kent’s description. Unfortunately, I only met with a single 
example. This measured 0.075 mm., and was over three times as 
long as broad. The adherent disc I was unable to see, as the ex- 
tremity of the foot was constantly concealed among conferve. It 
tapers considerably posteriorly, and the body presents a fine trans- 
verse striation. The ciliary disc is elevated somewhat above the 
peristome, is inserted somewhat obliquely, and is capable of retrac- 
tion. The mouth occupies the other half of the peristome, which is 
furnished with a few bristle-like cilia. The ciliated pharynx leads 
down from the mouth towards the centre of the body. Immediately 
beneath the edge of the peristome and below the ciliary dise is the 
single contractile vesicle (c. v.), while below it was a granular ovoid 
body (n.), corresponding with which was a similar structure on the 
other side of the pharynx. I was not able to distinguish any con- 
nection between these two bodies, but imagine them to be portions 
of the nucleus. According to Kent’s description, D’ Udekem’s form 
differs from mine in the comparative length and breadth, in the 
smoothness of the cuticle, and in the snout-like projection of the 
anterior margin when contracted. He also describes the animalcule 
as being bent to one side when in the contracted state, and trans- 
\Ueber der Organisation der Infusiorien, insbesondere der Vorticellinen Muller’s Archiv. 1856. 
