296 HANDBOOK OF PROTOZOOLOGY 



Genus Rhynchocystis Hesse. Body ovoid or cylindrical, 

 with a proboscis-like process at the anterior end. 



Rhynchocystis pilosa (Cuenot). In Lumbricus terrestris, L. 

 rubellus, and L. castaneus. 



Genus Allantocystis Keilin. Body elongate pyriform. Asso- 

 ciation endwise without changing forms, hence the cyst is 

 elongated. Spores asymmetrically fusiform. Number of sporo- 

 zoites within a spore unknown. 



Allantocystis dasyhelei Keilin (Fig. 125, a-d). Grown tropho- 

 zoite 70 microns by 20 microns. Cyst 150 microns by 20 mi- 

 crons. The spore is 18 microns by 7 microns. In the space 

 between the gut-epithelium and the peritrophic tube of larvae 

 of Dasyhelea obscura, a ceratopognid insect of the elm and 

 horse-chestnut trees. 



Legion 2 Ce^halina Delage 



The body is divided into the protomerite and deutomerite 

 by an ectoplasmic septum. An endwise association of two tro- 

 phozoites (syzygy), is common. The anterior individual is 

 called the primite and the posterior satellite. Parasites of the 

 digestive tracts of invertebrates, especially arthropods. Some 

 of the representatives are as follows: 



Genus Gregarina Dufour. Trophozoites associative. The 

 epimerite is small, globular or cylindrical. The spore is dolioform 

 to cylindrical. The cyst opens by sporoducts. Many species. 



Gregarina blattarum Siebold (Fig. 125, e). In the digestive 

 tract of the cockroach. 



Gregarina locustae Lankester (Fig. 125,/). In the intestine 

 of the Carolina locust, Dissosteria Carolina. 



Gregarina oviceps Diesing (Fig. 125, g). In the intestine of 

 the crickets, Gryllus spp. 



Genus Hirmocystis Leger. Two to twelve or more tropho- 

 zoites are associated in a line. The epimerite a small cylindrical 

 papilla. Thecyst opens by simple rupture. The spore is ovoidal. 



Hirmocystis harpali Watson (Fig. 125, h). In the intestine 

 of the beetle, Harpalus pennsylvanicus erythropus . 



Genus Leidyana Watson. Solitary. Epimerite a simple 

 globular sessile knob. The cyst possesses sporoducts. The spore 

 dolioform. 



