Ciliophora 407 



V ^ . v\\\VSi\l!ii//7//; ' ' '''^''' ''-^ 



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H G 





Fig. 7. 45. A-F. Ellobiophrya doiiacis Chatton and Lwoff: mature stage 

 (A) attached to gill-filament of Donax vittatiis, x400; completion of fission 

 (B), x575; development of migratory larva (C), x575; stage in formation of 

 embryonic stalk (D), x675; swimming larva (E), x675; young organism re- 

 cently attached to gill-filament (F), aboral cilia still present, x675 (after C. 

 & L.). G-I. Cyclochaeta domerguei Wallengren: view of aboral surface (G), 

 x-500; lateral view (H); section through vestibule and contractile vacuole (I), 

 x750 (after MacLennan). 



Telotrochidium henenguyi (138) and Cyclochaeta domerguei (146) both 

 swim with the aboral pole directed forward. 



Family 1. Astylozoonidae. These are actively swimming peritrichs which 

 travel with the peristome directed forward. Instead of a stalk, one or two 

 apparently thigmotactic bristles are developed at the aboral pole. The 

 family has been considered a highly specialized group (106). 



