1903.] NATURAL SCIENCES OF PHILADELPHIA. 635 



Deutomente: Ordinarily cylindrical to flask-shaped. Occasionally 

 ellipsoidal to oval. The cylindrical forms, in which the ratio of 

 breadth to length is 1 to 4, display the tendency toward the assumption 

 of the flask shape, in that the greatest breadth is in the posterior half. 

 Wlien the flask shape is assumed, the body of the flask may take up 

 from one-third to three-fourths of the deutomerite. In such cases, 

 the ratio of breadth to length may be as high as 1 to 2. The contour 

 of the deutomerite is frequently slightly irregular. 



Epicyte: Well developed. About 3 microns thick in the deuto- 

 merite, slightly thinner in the protomerite, except at the anterior tip. 

 Here it is thickened and shows an apparent pore. There is no evidence 

 that the epicyte is actually pierced, however, and the apparent pore 

 is probably the rudiment of an epimerite. Longitudinal striations 

 conspicuous. 



Sarcocyte: Well developed all over the animal. About one-half 

 as thick as the epicyte. Greatly thickened at the anterior tip of the 

 protomerite. Septum thick, curving backward. 



Myocyte: Easily demonstrated by the use of reagents, and visiljle in 

 living animals under favorable circumstances. 



Entocyte: Uniformly granular. Very dense in the larger animals. 

 Granules of the protomerite differing in character from those of the 

 deutomerite. 



Nucleus: Spherical, wdth one large spherical karyosome. 



Hosts: Julus and the smaller species of Parajulus. Wliat is ap- 

 parently the same gregarine is occasionally present in Lysiopetalum 

 lactarium Say. Very common. 



Locality: Eastern United States. 



This species is easily separated from S. juli by the size of the pro- 

 tomerite. In S. juli the length of the protomerite, according to the 

 figures given by Schneider (1875), makes up only about 6 per cent, of 

 the total length. In S. julipusilli this proportion' increases to 10 per 

 cent, in the adults and 15 per cent, in the young. From Stenophora 

 varians, recently described by Leger et Duboscq (1903), S. julipusilli 

 differs in being a larger and bulkier animal and in having the breadth 

 of the protomerite almost invariably greater than the length. 



The Diplopod Parafulus, while frequently parasitized by Stenophora 

 julipusilli, shows at times other gregarines which cannot be placed 

 in that species. These present themselves under several forms, the 

 differences between which, if permanent, are certainly of specific 

 value. My observations, however, have not as yet been thorough 



