63] STUDIES ON GREGARINESKAMM 63 



Sporonts solitary, rather obese. Total length '0.162 to 0.188"" (Kolli- 

 ker), Width 0.045'". Ratio LP : XL :: 1 : 4 to 5; WP : WD :: 1.3 : 1. 

 Protomerite rounded, slightly wider than high, constriction at septum. 

 Deutomerite narrower than protomerite, tapering to a blunt posterior 

 extremity. Epimerite composed of 4 to 6 sharp recurved hooks set upon 

 a long cylindrical neck. Nucleus spherical with one or two large karyo- 

 somes. 



Host: Larva of several species of Agrion. Intestine. 



Taken at Danzig, Wurtzburg. 



Kolliker says this species was first taken by von Siebold but not 

 described. Kolliker described it in detail and assigned to it a name. 



Frantzius placed it in the genus Actinocephalus because of the charac- 

 ter of the epimerite. 



Labbe placed the species with Eoplorhynchus oligacanthus Schn. because 

 of a close similarity with this genus. While the epimerites of the two 

 species are similar, Kolliker's species having 4 to 6 recurved hooks and 

 Schneider's 6 to 8, the hooks on the former species are sharply pointed and 

 decidedly recurved while those on the latter number eight as a maximum 

 and are but slightly recurved and blunt at the tips. (Cf. Figs. 13 and 14 

 (Hoplorhynchus oligacanthus} with Fig. 12, the present species). 



The writer has differentiated the two species on this point and a 

 dissimilarity of the nuclei. Schneider's new genus, Hoplorhynchus, is 

 characterized by an elongate-ovoidal nucleus while the nucleus in Kolliker's 

 species is spherical. 



ACTINOCEPHALUS OCTACANTHUS Frantzius 



[Figure 74] 



1848 Gregarina Heerii Frantzius 1848: 193 



1848 Actinocephalus octacanthus Frantzius 1848: 192, 194, 195 



1851 Gregarina Heerii Diesing 1851:552 



1851 Gregarina Fr antziusiana Diesing 1851: 8 



1863 Gregarina Heerii Lankester 1863:94 



Host: Phryganea sp. Intestine. 



Frantzius recognized that this species was different from the Gregarina 

 Heerii of Kolliker from the same host, and illustrates epimerites of the two 

 species, but his drawings are confusing for in another place he calls the 

 same drawing now one name, now the other. 



Diesing regarded the two species as synonymous on one page (552) and 

 still separates them on another, creating a new species for the present 

 species, Gregarina fr antziusiana. He differentiates the two thus: 



