162 ILLINOIS BIOLOGICAL MONOGRAPHS [372 



STYLOCEPHALUS GIGANTEUS Ellis 



[Figures 108, 109] 

 1912 Stylocephalus giganteus Ellis 1912:25-27 



Stylocephalus: Sporonts solitary, elongate. Length 1200 to 1800/*. 

 Width, not given. Ratio length protomerite : total length : : 1 : 9 to 

 1 : 18 ; width protomerite : width deutomerite : : 1 : 1 to 1 : 1.5. Proto- 

 merite dome shaped, widest at base or dome shaped, dilated above base, 

 flattened anteriorly. Constriction at septum. Deutomerite widest at 

 shoulder. Cylindrical, terminating in an abrupt but sharply pointed 

 cone. Epimerite a long pointed cone, situated upon a conoidal projec- 

 tion of the protomerite of the cephalont. Endocyte dense. Nucleus not 

 described. 



Cysts spherical, 450/A in diameter, entire surface papillated and in- 

 dented, dehiscence by pseudocyst, spores extruded in chains. Spores ir- 

 regularly subspherieal, black, 7 by 11/x. 



Taken at Boulder, and at Denver, Colo. Hosts : Eleodes sp. ; Asida 

 opaca Say ; Asida sp. and Eusattus sp. Habitat : Intestine. 



SPHAERORHYNCHUS OPHIOIDES (Schneider) Labbe 



1886 Sphaerocephalus ophioides Schneider 1886:100 



1899 Sphaerorhynchus ophioides Labbe 1899 :32 



Sphaerorhynchus : Sporonts solitary, elongate. Length 3 to 4 mm. 

 Epimerite 1/6 the total length of cephalont, consisting of a small spheri- 

 cal or ovoidal body carried on a long cylindrical stalk, broadest at base 

 and gradually narrowing toward apical end. Cephalonts 1.3 mm. long, 

 220/i of which is length of epimerite and 8.5/x, for the terminal sphere. 



Taken at . Host: Acis sp. Habitat: Intestine. 



ACANTHOSPORA PILEATA Leger 

 [Figures 162, 215] 



1892 Acanthospora pileata Leger 1892:145-6 



1899 Acanthospora pileata Labbe 1899 :28 



Acanthospora: Sporonts solitary, elongate. Length 300 to 400/A. 

 Ratio length protomerite : total length : : 1 : 6 ; width protomerite : 

 width deutomerite : : 1 : 1.5. Protomerite nearly hemispherical, little 

 higher than wide, constricted at septum. Deutomerite elongate ellipsoi- 



