IS07 I 31ICR0SC0PICAL JOURNAL. HI 



(icr olisei-vatioii tor four hours umk-rvvtMil ii\(' ciiaiiges 

 and during' the lu'lio/.oan |ilias(.' captured and cng'nlidied 

 six large turnisof Hexaniita inllata (which were abund- 

 ant), tliree forms of (yercomonas longicauda and two forms 

 of lleteromita lens. From this and a number of similar 

 observations the writei- feels justified in concbidini^' tiiat 

 this inf'usoriaii is truly carnivorous. 



Larger infusoria and those of <4"reater consistency 

 when in contact with the rays were visiliK affected: they 

 seemed to ex pericMiee ;i shock, changed their routes and 

 shickened their pace. A number of large forms of the 

 very active Trepomonas agilis were often found among 

 the rays and were not atl'ected in the slightest manner. 

 Defecation was observed during both stages, but the flag- 

 ellate form was never seen to take food. 



During the heliozoan stage this form has no locomotive 

 movement and is not ancliored in any way; this last as- 

 sertion is clearly demonstrated by its being at the mercy 

 of every current produced by a passing iufusoriau, worm 

 or rotifer. 



Saville Kent, in his manual of the Infusoria, mentions 

 an observation of his wherein he witnessed tlie develop- 

 ment of an Actiiiopiiry tVom a flagellate 7xosj)ore. In 

 his figure of the zoospore the contractile vesicle is placed 

 ill the posterior half, and in his figure of tlie Actino[)hry 

 the uindeus is central. The [)osition ef these two essen- 

 tials corresjionds with the form here describe(l. It may 

 be presumptuous, luit the writer cannot helj) but incline 

 to the belief that if the .\ctinophry had been given a pro- 

 longed study it miLiht lia\e revertcfl to its original fiag- 

 ellaie state and thus have lendered this record of a new- 

 form unnecessary. 



Family. — Heteromitida\ S. K. 

 Genus. — lleteromita. Dujardin. 

 Species. - Heteromita liguhita (fig. 4) 

 Bodv ovate, cvlindrical; one and a half to two times 



