new Infusoria from American Fresh Waters. 441 



tudinal fission, beginning at the anterior border, has been 

 noticed in both. 



Tillina JlavicanSj sp. nov. (PI. XV. fig. 8.) 



Body subreniform or bean-shaqed, soft and flexible, but 

 persistent in form, holotrichous, minutely roughened and 

 obliquely striate, the anterior and posterior extremities sub- 

 equal in width, the anterior body-half compressed ; oral aper- 

 ture ovate, obliquely placed near the centre of the right-hand 

 border of the ventral surface ; pharyngeal passage long, 

 recurved, entirely ciliate ; contractile vesicle single, spherical, 

 on the left-hand margin near the posterior extremity ; nucleus 

 spherical, subcentrally located ; anal aperture postero-terminal. 

 Length of body ^r^ to -giro inch. 



Hab. An infusion of dead leaves. 



The animalcule's movements are rapidly forward in straight 

 lines or in irregular spirals, commonly with one side or the 

 other downward. The food-particles are usually collected in 

 conspicuous spherical masses, which are carried around the 

 body in a quite constant endoplasmic current. The colour, 

 usually a shade of brown, varies considerably, probably being 

 affected by the colour of the infusion in which the animalcule 

 thrives. 



In the 'American Naturalist' for February 1884 the writer 

 referred to a species of this genus under the name of Tillina 

 inflata, which was not there described. As it and the pre- 

 ceding somewhat closely resemble each other, T. inflata i3 

 here diagnosed and a figure given for comparison, although 

 the likeness is confined chiefly to internal structure. 



Tillina inflata, Stokes. (PL XV. fig. 9.) 



Body irregularly subreniform, obliquely striate, entirely 

 ciliated, the posterior body-half rounded, inflated, conspicu- 

 ously widened, and somewhat oblique; the anterior half 

 compressed, its ventral surface flattened ; oral aperture ovate, 

 ventral, obliquely placed, and followed by a short, recurved, 

 entirely ciliated pharyngeal passage ; nucleus ovate or 

 spheroidal, subcentrally located ; contractile vesicle single, 

 spherical, postero-terminal; anal aperture postero-terminal, 

 in close proximity to the pulsating vacuole. Length of body 

 zh to eon inch. 



Hab. Water in which the bulbs of the Chinese Narcissus 

 were growing. 



This interesting creature is found only in the habitat men- 



