264: Transactions of the Society. 



Vorticella citrina Ehrbg. 



Very abundant in an infusion of dry leaves (August). Body 

 broadly campanulate, not narrowed behind the anterior ' end. 

 Length of the body, including the basal cone-like projection, 26 /a 

 in one specimen (somewhat contracted), and 50 fi in another 

 specimen. Length of the stalk about three to five times the 

 lengtli of the body. 



Genus Cccrchesium Ehrbg. 

 Garchesium epistylidis CI. & Lachm. 



iSTumerous colonies on the gills, legs and tail bristles of 

 Ephemerid larvae in pond water Irom Shalamar Gardens (August), 

 each colony consisting of a few (two to four) individuals only. 

 Individual zooids separately contractile, the thread in the stalk 

 being interrupted at each bifurcation. Stalk four to five times the 

 length of the body, smooth, and in contracting the portion of the 

 stalk near the animal thrown into a spiral. Some stalks end in 

 two zooids, the stalk just bifurcating near the tip, one portion con- 

 taining the thread and the other not. Individual zooids about o2 fju 

 in length ; anterior end slightly less wide than the middle of the 

 body ; peristomial margin thickened, slightly reversible. Contractile 

 vacuole situated about the middle of the body. Nucleus slightly 

 curved, somewhat kidney-shaped. Contracted zooid pyriform in 

 shape, cuticle smooth. 



The form encountered differed however from the type in lacking 

 the articulate character of the stalk. 



Genus Epistylis Ehrbg. 



Epistylis plicatilis Ehrbg. 



Forming a whitish tuft on shells of snail (probably Limnimts) 

 in pond water in Shalamar Gardens (August). Long dichotomously 

 branching colonies ; individuals independently contractile, with no 

 thread running in the stalk. The secondary branches of the stalk 

 showed longitudinal striations at the attachment of the zooid, but 

 are otherwise granular and somewhat feathery in appearance. 

 Length of the expanded zooids is <S4//, to 126 /x. Peristomial 

 margin dilatable ; ciliary disc capable of considerable projection 

 when the animal is in a fully expanded condition. Wlien con- 

 tracted there is an anterior projection, and the posterior half of the 

 body shows distinct transverse pleating, wliich is characteristic of 

 the species. 



