42 ILLINOIS BIOLOGICAL MONOGRAPHS [42 



Typical sporont cysts are also noted in the excrement from the alimen- 

 tary tract. 



The authors think that the two kinds of sporozoites represent different 

 species of parasites, the sporogonic representing the new species, Frenz- 

 lina occllata. I am of the opinion that but one species is involved. See 

 discussion under Cephaloidophora fossor and also Discussion of the New 

 Family Cephaloidophoridae, at the beginning of Crustacean Parasites. 



CEPHALOIDOPHORA MACULATA Leger and Duboscq 

 [Figure 68] 



1911 Cephaloidophora maculata Leger and Duboscq 1911 : lix 



1912 Cephaloidophora maculata Tregouboff 1912 : liv 

 1912 Cephaloidophora maculata Mercier 191 2a: xliii 



Sporonts small, ovoidal, maximum length 80/x. Ratio LP :TL :: 1 

 : 4 to 5; WP : WD :: 1 : 1.5 to 2. Cytoplasm yellowish in deutomerite, 

 clear in protomerite. Spherical chromidial bodies in protomerite. Nu- 

 cleus small, spherical, one karyosome. Characteristic crescentic apical 

 area in protomerite. Cysts spherical, 100/t in diameter. Spores spherical 

 to subspherical, 4^t in diameter, with equatorial line. Intracellular stage 

 observed. 



Intestine of Gammarus marinus Leach. 



Taken at Roscoff, France. 



CEPHALOIDOPHORA TALITRI Mercier 



[Figure 86] 



1912 Cephaloidophora talitri Mercier 1912:38 



1912 Cephaloidophora talitri Mercier 1912a: xliv 



1912 Cephaloidophora talitri Tregouboff 1912: Iv 



Sporonts in pairs, primite the larger, ovoidal, average length 40/x. 

 Ratio LP : TL :: trophozoites 1 : 4.5 to 6; WP : WD :: 1 : 1.2 to 2. 

 Protomerite dome-shaped with rudimentary epimeritic area at apex. 

 Slight constriction at septum. Deutomerite broadly ovoidal, nucleus 

 spherical with one large karyosome. Intracellular stage noted. 



Cyst and spores unknown. 



Intestine of Talitrus saltator Mont. 



Taken at Roscoff, France. 



CEPHALOIDOPHORA OLIVIA (Watson) Kamm 



[Figure 83] 



1912 Frenzelina olivia Watson 1916: 133 



1922 Cephaloidophora olivia Kamm 1922 (this paper) 



Sporonts in pairs, max. length association 218/z, ellipsoidal, largest 

 sporont 118 by 36 M . Ratio LP:TL::1 : 5. WP : WD :: 1 1 3 



