LIBRARY 

 NEW YORK 



JOUENAL TAro^,-*- 



OF THE 



EOYAL MICROSCOPICAL SOCIETY. 



AUGUST 1889. 



TRANSACTIONS OF THE SOCIETY. 



VII. — Notices of New Peritriehous Infusoria from the Fresh Waters 

 of the United States. 



By Dr. Alfred C. Stokes. 



{Read 8th May, 1889.) 



Plate X. 



Epistylis vittata sp. no v., fig. 1. 



Bodies elongate-ovate, less than three times as long as broad, 

 widest centrally, tapering posteriorly, slightly constricted beneath the 

 peristome ; cuticular surface finely striated transversely, the posterior 

 one-fifth also longitudinally striate ; peristome border broad, not 

 everted, not revolute, but when expanded slipping backward and in- 

 vaginating the anterior border of the body as by a broad, somewhat 

 concave band, both margins of which are usually crenulate ; ciliary 

 disc convex, prominent ; ciliary circles four ; nucleus long, band-like, 

 much curved, often irregularly constricted ; pedicle profusely and 

 dichotomously branched, becoming brown with age ; ultimate divisions 

 of the foot-stalk about as long as the extended body ; zooids many, 

 often one hundred or more in number ; contracted bodies obovate, 

 posteriorly annulate in several transverse folds, anteriorly plicate, 

 the contracted ciliary disc frequently conical or snout-like ; endoplasm 

 granular, often brownish. Length of bodies 1/120 in. ; fully de- 

 veloped colony 1/5 in. in height, conspicuously visible to the naked 

 eye. Hab. Fresh water, attached to the shell of Physa. 



Ejyistylis ehngata, sp. nov., fig. 2. 



Bodies elongate, less than four times as long as broad, widest 



centrally, tapering thence posteriorly, the sides of the anterior region 



CO nearly parallel or slightly tapering ; cuticular surface very finely 



EXPLANATION OF PLATE X. 



Fig. 1. — Epistylis vittata. | 

 „ 2. — „ elongata. 



„ 3. — „ autumnalis. \ 



„ 4. — „ ramosa. I 



„ 5. — Pyxidium nutans. \ 



1889. 2 L 



