108 Dr. A. C. Stokes on some 



therefore liuve misintcvpreted some of the appearances. My 

 drawings are, I fear, little more than diagrams. 



Rhabdostyla pusilla^ sp. nov. (PI. I. fig. 17.) 



Body campanulate, tapering posteriorly, less than twice as 

 long as broad ; cuticular surface transversely striate ; peri- 

 stomial border revolute, slightly exceeding the body-centre in 

 width ; pedicle scarcely longer than the body ; contracted 

 animalcule ovate. Length of body jj^b inch. 



Hah. Pond water, on Ceratophyllmn. 



Thus far but three individuals of this readily recognizable 

 form have been met witli, all of these being attached near 

 together on a fragment of Ceratophyllum. It is the smallest 

 member of the genus yet observed, and could easily be iden- 

 tified by its diminutive proportions alone. Each of the three 

 specimens noted had the pedicle attached as shown in the 

 figure, the extremity being adherent to the side of the plant 

 opposite to that on which the Infusorian habitually expanded 

 itself, the lower portion therefore curving around the basis 

 of support and apparently acting as a spring wdiereby the con- 

 tracted animalcule was suddenly and rapidly thrown to that 

 side of the plant to which the pedicle was attached, the body 

 of the animalcule then, as well as on its return to the former 

 position, describing a semicircular path through the water. 

 That this is, as I believe, characteristic of the species can be 

 determined only by examining a larger number than has yet 

 been obtained. 



Vorticella Lemnce, sp. nov. (PI. I. fig. 18.) 



Body conical-cam panulate or subpyriform, not changeable 

 in shape, less than twice as long as broad, widest centrally, 

 the posterior extremity tapering j cuticular surface finely 

 striate transversely ; peristomial border revolute, not everted, 

 slightly narrower than the body-centre ; pedicle from two to 

 three times as long as the body ; pharyngeal passage long ; con- 

 tractile vesicle close to the vestibulum. Length of body x,^ 

 inch. 



Hab. Pond water, on the rootlets of Lemna. Solitary. 



In form this resembles V. octava, Stokes *, but is readily 

 recognized as different by its persistence of shape, by the 

 proportionate length of the pedicle, and especially by the 

 absence of the peculiar twisted appearance of the sheath. 



* This journal, June 1885. * 



