351] STUDIES ON GREGARINES— WATSON 141 



ACTINOCEPHALUS CRASSUS (Ellis) 



1912 Stephanophora crassa 



1913 Actinocephalus crassus 



Actinocephalus : Sporonts solitary, obese. Length 50 to 60/a; width 

 not given. Ratio length protomerite : total length : : 1 : 3.3 to 1 : 3.5. 

 Width protomerite : width deutomerite : : 1 : 1 to 1 : 5. Protomerite 

 dome shaped, a little wider than high, constricted at septum. Deuto- 

 merite widest in anterior third, where it is a little wider than the 

 protomerite, narrowing abruptly to a rather sharply pointed posterior 

 extremity. Nucleus small, spherical. Cyst and spores not known. 



Taken at Quirigua, Guatemala. Host: Leptochirus edax Sharp. 

 Habitat : Intestine. 



The determination of the species above is not absolute. Since 

 generic diagnoses depend on the character of the epimerite and the 

 spores as well as on other factors, the absence of these factors tends to 

 make the determination indeterminate. By elimination of negative 

 factors, however, the generic determination is probably correct. 



ACTINOCEPHALUS ZOPHUS (EUis) 



1913 Stephanophora zopha 

 1913 Actinocephalus zophus 



Actinocephalus ; Sporonts elongate, length 1200 to 1600/a. Width not 

 given. Ratio length protomerite : total length :: 1 : 8 to 1 : 13; 

 width protomerite : width deutomerite :: 1 : 1.7. Protomerite glo- 

 bose, rounded in front. Constriction at septum. Width same as length. 

 Deutomerite slender, elongate. Widest at shoulder, cylindrical, taper- 

 ing at posterior end to a sharp point. Epimerite persistent, constriction 

 at base and terminating in a corona of 9 or more small regular, rounded, 

 digitiform processes. Endocyte brown, nucleus not seen. Cyst and 

 spores not known. 



Taken at New Orleans, La., and at East Falls Church, Va. Hosts : 

 Nyctobates iariata Knoch (N. harbarata Kn.) ; Nyctohates pennsyl- 

 vanica deGeer. Habitat : Intestine. 



This species was described by Ellis as belonging to the genus 



