389] STUDIES ON GREGARINES— WATSON 179 



deutomerite : : 1 : 1.1 Protomerite subglobular, somewhat flattened 

 anteriorly. Widest through middle portion. Width 11/^ times height. 

 Deep constriction at septum. Deutomerite elongate ellipsoidal, widest 

 about or little above middle, terminating bluntly. Nucleus large, spher- 

 ical, content not noted. Endocyte coarsely granular, not dense. 



Cysts 170 to 200/A in diameter, spherical, dehiscence by "one enor- 

 mous spore duct." Spores cylindrical, 25 by 10/^, square cornered. 



Taken at Wyncote, Pa., and Vincennes, Ind. Hosts : Harpalus cali- 

 ginosus Fab. and H. pennsylvanicus Dej. Habitat: Intestine. 



Crawley created a genus Gigaductus for this species. The genus is 

 described thus: 



"Cysts spherical, with a thin gelatinous envelope. Dehiscence by one enor- 

 mous spore duct. Maturation period short. Spores cylindrical, very large. Wall 

 single, thick. Spores marked with diagonal lines, those on one side opposed in 

 direction to those on the other, giving the spore a latticed appearance. These 

 lines are apparently due to the sporozoites, which make up a hollow cylinder lying 

 in contact with the inner surface of the spore wall. The residuum, an ellipsoidal 

 mass liberally provided with granules, occupies the cavity of this hollow cylinder." 



I have placed the species in question under the genus Gregarina. 

 Several hitherto described species of the genus Gregarina have been re- 

 corded to dehisce by one spore duct (e. g. G. laucournetensis; G. longi- 

 rostris). It is to be noted that sometimes cysts of the genus Gregarina 

 develop only one spore duct and others in the same fecal mass several. 

 There is apparently no maximum-minimum limit to the number of ducts 

 which may be present within the same species. 



GREGARINA LUCANI (Crawley) Watson 



[Figure 150] 



1903 Euspora lucani Crawley 1903:50-1 



1916 Gregarina lucani Watson (This paper) 



Gregarina: Sporonts biassociative, elongate ellipsoidal. Length of 

 associations 880|U. Primite 520)u, long, 128/x wide. Ratio length proto- 

 merite : total length primite : : 1 : 10 ; width protomerite : width 

 deutomerite : : 1 : 1.7. Protomerite flattened, widest through middle, 

 twice as wide as high, deep constriction at septum. Deutomerite flat- 

 tened or broadly rounded behind. 



Cyst and spores unknown. 



