78 ILLINOIS BIOLOGICAL' MONOGRAPHS [288 



protomerites alone would radically differentiate the two species. The 

 latter has since been named Stenophora polydesmi. 



Labbe says of the Antinocephalidae, to which the genus Amphoroi- 

 des belongs the members are parasites of the 



"tube digestif d 'Arthropodes carnaissere" 

 but the diplopod Polydesmus is surely not carnivorous. 



AMPHOROIDES CALVERTI (Crawley) Watson 



[Figure 52] 



1903 Gregarina calverti Crawley 1903 :48 



1903 Gregarina calverti Crawley 1903a :638 



1915 Amphoroides calverti Watson 1915:30 



Amphoroides : Sporonts solitary, elongate. Maximum length 1670/1, 

 average length 1400/x, average width 120/*. Ratio length protomerite : 

 total length : : 1 :47 ; width protomerite : width deutomerite : : 1 :2.5 to 

 1 : 3. Potomerite greatly compressed in sporonts, shallow, five times as 

 wide as high. Deep crater within the top. Constriction at septum sharp 

 and deep. Deutomerite elongate, widest in anterior third, tapering to 

 a sharp point. Endocyte of protomerite tan in color, not dense ; of deu- 

 tomerite opaque, white. Nucleus small, spherical, not visible in vivo. 

 Myocyte well developed. Cysts spherical, 380/* in average diameter. De- 

 hiscence by simple rupture. Spores not known. 



Taken at Wyncote, Pa., and Urbana, 111. Host: Callipus lactarius 

 (Say); Lysiopetalum lactarium (Say). Habitat: Intestine. 



This species was described by Crawley (1903) as belonging to the 

 genus Gregarina. Later (1903a) he described the cysts and spores as 

 follows : 



"Cysts spherical - - - 250 - 360^ in diameter. Dehiscence effected by 

 sporeducts, from 4 to 8 in number, not exceeding in length the diameter of the 

 cyst. Spores doliform, 13 by 5p.. A single thick spore wall. " 



I have seen one cyst from this species which measured 380/x, in di- 

 ameter and indicated dehiscence by rupture and not by spore ducts. 

 Crawley probably confused the cysts of this species with those of another 

 which may have been developing in the damp chamber at the same time. 

 This gregarine bears no resemblance to the members of the genus 

 Gregarina whose cysts dehisce by spore ducts, either in its habitat, in a 

 diplopod, or ija any of the characteristics of the sporont. The elongate 

 shape, character of movement by slow contortions, great size of the indi- 

 vidual, and chiefly the fact that all the animals are solitary tend to prove 

 conclusively that this species is not a member of the genus Gregarina. I 



