570 PROTOZOOLOCxY * 



to Idyaea fiircata; ovoid tro])honts enter the copopod when eaten 

 by Cladnema radiatuni,. 



Genus Gymnodinioides Minkiewicz {Physophaga Percy; Oospi- 

 ra Chatton et Lwoff; Hyalospira Miyashita). Trophonts twisted 

 along equatorial plane; generally 9 ciliary rows, in some a rudi- 

 mentary row between striae 5 and 6 at anterior end. Many spe- 

 cies. 



G. calkinsi Chatton et Lwoff. Phoronts on gills and trophonts 

 in the moult of Palaemonetes sp. ; Woods Hole. 



Genus Phoretrophrya Chatton et Lwoff. Trophonts generally 

 with 9 ciliary rows; striae 1, 2, and 3, close to one another. One 

 species. 



P. nehaliae C. et L. (Fig. 258, c). Phoronts and tomonts on 

 appendages, and trophonts in the moult, of Nehalia geoffroyi. 



Genus Synophrya Chatton et Lwoff. Trophonts and tomonts 

 similar to those of Gymnodinioides; but development highly com- 

 plicate. One species. 



S. hypertrophica C. et L. (Fig. 258, d). Phoronts in branchial 

 lamellae, and trophonts in the moult, of Portunus depurator, etc. 



Geniis Ophiurespira Chatton et Lwoff. Trophonts ovoid; 10 

 ciliary rows; striae 9 and 10 interrupted. One species. 



0. weilli C. et L. (Fig. 259, a). Trophonts in intestine of Ophio- 

 thrix fragilis and Amphiura squamata. 



Genus Photorophrya Chatton et Lwoff. Trophonts small; cilia- 

 tion approximately that of Ophiurespira; massive macronucleus; 

 with peculiar trichocysts comparable with the nematocysts of 

 Polykrikos (p. 228); ecto- or endo-parasitic in encysted stages of 

 other apostomeans. Several species. 



P. insidiosa C. et L. (Fig. 259, 6). Phoronts, trophonts and 

 tomites in phoronts of Gymnodinioides. 



Genus Polyspira Minkiewicz. Trophonts reniform ; 9 rows and 

 several extra rows; striae 1-4 and 5-9 with 2 others in 2 bands. 



P. delagei M. (Fig. 260, a). Phoronts on gills and trophonts in 

 the moult of Eupagurus berhardus. 



Genus Pericaryon Chatton. Trophonts ellipsoid; 14 ciliary 

 rows. 



P. cesticola C. (Fig. 259, d). Trophonts in gastro-vascular cav- 

 ity of the ctenophore, Cestus veneris; other stages unknown. 



Genus Calospira Chatton et Lwoff. Trophonts resemble those 

 of Spirophrya; 20 ciliary rows; macronucleus twisted band-form; 

 a micronucleus. 



