954 PROTOZOA AND OTHER ANIMALS 



Rules of Zoological Nomenclature demand Conidiophryidae. A complete 

 account of Conidiophrys was given by these authors in their second 

 article (1936a). 



In a manner suggesting the case of SaccuUna, the determination of 

 the systematic position of Conidiophrys is possible only through study of 

 its early development. 



The form attached to the hairs (Fig. 204A) is immobile, nonciliated 

 (though an infraciliature is present), and is enclosed in a shell-like 

 pellicle which has no opening and beyond the body proper closely en- 

 cases the hair (Fig. 204B). The cucurbitoid trophont undergoes several 

 transverse divisions within the capsule, toward its distal end, producing 

 normally two or three (Fig. 204C) , or sometimes as many as six tomites. 

 One specimen was observed with eleven tomites and a twelfth forming, 

 but the distal seven were degenerate (Fig. 204D). When completely 

 formed, the tomite, the longitudinal axis of which is transverse to the 

 longitudinal axis of the trophont, is provided with cilia, with a cytostome 

 opening on the ventral surface, and with a relatively long, incurved, 

 ciliated cytopharynx (Fig. 204F). Tomites are liberated periodically 

 and have a very short period of free-swimming existence. 



When the cytostome comes in contact with the end of a secretory hair, 

 this is drawn in and the tomite becomes impaled obliquely on it (Fig. 

 204F). The form rapidly changes to that of a tear drop and the cilia are 

 lost (Fig. 204G). Growth to the typical trophont proceeds. Chatton 

 and Lwoff maintained that Conidiophrys is not nourished by diffusion 

 from the surrounding water, but depends on the fluid secretion that 

 enters it through the pores at the end of the secretory hairs. Dependence 

 of the trophic form (trophont) upon the host is thus absolute. 



In discussing the multiplicative polarity of Conidiophrys, fission being 

 localized at the distal pole, Chatton and Lwofl^ (1936a) speculated con- 

 cerning a possible trophic or humoral influence emanating from the 

 host. Instances of inhibition of division, complete or partial, under the 

 influence of parasitic nutrition are given among parasitic dinoflagellates, 

 apostomatous ciliates, and other Protozoa. (The authors did not com- 

 ment, however, on the absence of any indication of such inhibition in a 

 great number of endozoic forms, a fact which is an impediment to the 

 acceptance of their theoretical explanation.) In Conidiophrys inhibition 

 is exhibited in the removal of the zone of multiplication to a distance 



