46 PROCEEDINGS OF THE ACADEMY OF [Jan.. 



the younger animals. Never any constriction between it and the deu- 

 tomerite in relaxed animals . 



Deutomerite: Long. Anterior half usually much broader than pos- 

 terior half. Usually considerably curved. 



Epicyte: Very distinct. H-2 microns thick. 



Sarcocyte: Distinct. 



EntocTjte: Usually, but not always, considerably denser in the ante- 

 rior part of the deutomerite than in the posterior part . 



Nucleus: Always with one karyosome . 



Dimensions: 400 microns long. 



Movements: This is a very active gregarine, and displays continually 

 both changes of shape and progression. The contractions are generally 

 confined to the anterior part of the deutomerite. As a rule, the smaller 

 animals are less active than the larger. 



Host: Polydesmus virginiensis. Infection is common, the parasites 

 being present in moderate numbers. 



Locality: Wyncote, Pa., and Raleigh, N. C. 



1 Gregarina elaterae sp. n. PI. I, tig. ii. 



Epimerite: Spherical, with a granular contents. Usual size and 

 appearance shown by fig. 11. In several cases, however, apparently on 

 account of the absorption of water, it had increased enormotisly in size, 

 so that its diameter exceeded the length of the gregarine. 



Protomerite: Elliptical in outline, with the greater axis transverse. 

 Posterior limit straight. Separated from the deutomerite by a sharp 

 constriction. 



Deutomerite: Oval to subspherical. 



Epicyte: Very thin. 



Sarcocyte: ?. 



Entocyte: Granular in all three segments . Sparsely filled with large 

 and verv^ distinct granules, so that the appearance presented was rather 

 that of a ciliate or a heliozoan packed with plant spores than a greg- 

 arine. 



Nucleus: Not seen. 



Dimensions: Maximum length 62 microns. 



Movements: The animals were very sluggish, the only movements 

 seen being an occasional lateral displacement of the protomerite, and, in 

 one case, progression of perhaps one-half the animal's length. 



Host: The larva of a large species of Elaier. Infection only occa- 

 sional, and never but a few gregarines prpsent . 



Locality: Wyncote. Pa. 



