The Microscope. 



229 



Let us turn now from the general to the specific, and consider 

 the few rare or new forms referred to at the beginning. 



Podophrya incUnata, n. s. (fig. 1.) Body nearly spherical in 

 young examples, somewhat pyriform in the 

 adult and inclining to one side or over- 

 hanging the pedicel; the surface is smooth 

 and the endoplasm granular. The nucleus 

 is subcentral, usually below the centre in 

 the adult, spheroidal, granular. The con- 

 tractile vacuoles (few in number, rarely 

 more than two seen) are small, pulsating 

 very slowly, placed anteriorly. The tenta- 

 cles are scattered about the anterior extre- 

 mity, not numerous, slightly capitate. 



The pedicel is narrow below, rapidly 

 thickening above, usually nearly straight, 

 sometimes decidedly curved or even 

 sigmoid. 



Length of the body ^^ of an inch ; height of the animal in- 

 cluding the pedicel, -^^-^f to ^^^^ of an inch. 



On swimming feet of Cambariis from the Niagara river. 

 Many examples of this species were obtained from crays taken 

 in the river during March and April of the present year, while there 

 was an abundance of ice. The characters appear to be so well 

 marked and constant that it is readily separated from any of the de- 

 scribed thick-pedicled species. In some examples, the pedicel is at 

 fiLrst narrow, then at about the middle abruptly widened so that the 



outline is paddle-shaped ; in one 

 instance it was comparatively slen- 

 der throughout and bent like the 

 letter s. 



Podophrya flexiUs, n. s., (fig. 2.) 

 The body is sub- spherical, very 

 flexible and plastic, endoplasm 

 transparent, containing a few 

 granules in the smaller examples 

 and a greater number in the larger, 

 so that the body is rendered 

 opaque by them, surface smooth. 

 The ovoid nucleus is granular, 



