68 



PROTOZOA 



2. PoDOPHRYA Ehrenberg. Body spherical or ovoid and attached 

 by a stalk; tentacles knobbed and radiating in all directions, either in 

 groups or not : several species ; in fresh and salt water. 



P. gracilis Calkins (Fig. 126). Diameter of body 

 .008 mm.; stalk very long, measuring .04 mm.: in salt 

 water; Woods Hole. 



3. Ephelota Wright. Body more or less spherical, 

 with a stalk; tentacles of two kinds, being either 

 pointed and used for piercing, or short and cylindrical 

 and used for sucking: 8 species; marine. 



E. coronata Wr. (Fig. 127). Diameter of body 

 .09 to .2 mm.; stalk three times as long, and thickest 

 at the body: common at Woods Hole on campanula- 

 rians, hydroids, etc. 



Family 2. ACINETIDAE. 



Body usually in a cup and usually stalked; ten- 

 tacles knobbed; reproduction by endogenous budding, 

 the spores being ciliated: 4 genera. 



1. AciNETA Ehrenberg. Body in a cup with a 

 stalk: several species; in fresh and salt water. 



A. divisa Fraipont (Fig. 128). Body .027 mm. 

 long and does not fill the cup; tentacles long; length of stalk .1 mm.: 

 common on Bryozoa at Woods Hole. 



Fig. 126 



Podophrya gra- 

 cilis (Calkins). 



Fig. 127 



Fig. 128 



Fig. 129 



Fig, 127 — Ephelota coronata (Calkins). Fig. 12S — Acineta divisa (Calkins). 

 Fig. 129 — Acineta tul)erosa (Calkins). 



A. tuberosa Ehr. (Fig. 129). Cup very delicate and often difficult 

 to see; tentacles in usually two groups; color yellow; length of body .33 

 mm. : at Woods Hole, in salt water. 



