20 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Fig. 3. — The successive positions taken by a gregarine {Stenophora 

 juli) after running head-on into an obstruction. 



Fig. 4. — The same phenomenon as that shown in fig. 3. Here the change 

 from h to c is accomplislied in the same way as tlie change from 6 to e in 

 fig. 3, and the change from dio e and from e to/ in the same way as the 

 change from the first to the last positions in fig. 2. 



Fig. 5. — A progressing gregarine {Stenojiliora juli) throwing the 

 anterior end out of the line of progression, which is shown by the ruled 

 line. (This line is incorrectly drawn too far to the left.) 



Fig. G. — A progressing gregarine (Steno2)hora juli) throwing the pos- 

 terior end out of the line of progression. 



Fig. 7. — A progressing gregarine (Echinomera hispida) making a 

 turn. Between c and d the narrow posterior end swung rapidly around 

 until it lay in line with the rest of the animal. 



Plate II. — Fig. 8.— The trail of gelatinous substance left behind by a 

 progressing gregarine {EcJiinomera hispida). 



Figs. 9, 10, 11.— The appendages of carmine, etc., which progressing 

 gregarines gather up and drag behind them. 



Fig. 12. — A gregarine {Stenophora juli) behind which are a number 

 of small particles, lying near a mass of host-tissue. Both the gregarine 

 and the small particles are entangled in an invisible, elastic substance 

 (see pp. 12-13 of the text). 



Fig. 13. — Anterior end of a gregarine {StenopJiora juli). The solid 

 line represents the longitudinal axis ; the broken line the axis of the 

 protomerite when displaced in the horizontal plane. 



