1903.] NATURAL SCIENCES OF PHILADELPHIA. 633 



Deutovierite: Conical, with usually a bluntly romided posterior end. 

 Broadest just behind the septum and tapering gradually and uniformly. 



Epicyte: Thick, showing a double contour all over the animal. 



Sarcocyte: Poorly developed or wanting, except for the septum, 

 which dips slightly backward. 



Entocyte: Dense in all cases. In the smaller animals, slightly less 

 dense in the protomerite than in the deutomerite. 



Nucleus: Invisible. 



Dimensions: Length of largest individuals seen, 600 microns. 



Cysts: Spherical. Diameter 410 microns, with a cuticular mem- 

 brane 40 microns thick. No gelatinous envelope. Dimensions of 

 spore-mass 400 by 300 microns. Jlaturation period 10 days. May 

 10-20, 1903. 



Spores: Length, 19 microns; breadth, 4 microns; refractive rods, 6 

 microns long. 



Host: Lithohius jorficatus Linn. Found in but one case, and then 

 present in small numbers. 



Locality: Raleigh, N. C. 



GIGADTJCTUS n. g. 



Cysts spherical, with a thin gelatinous envelope. Dehiscence by 

 one enormous sporoduct. 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 clue 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. 



The single species is: 



Gigaductus parvus n. sp. PI. XXX, figs. 10-13. 



Epimerite: Not seen. 



Protomerite: In the primites, generally forming somewhat more than 

 a hemisphere. In the satellites, slightly shortened, with a straight 

 anterior edge. Separated from the deutomerite by a sharp constric- 

 tion. 



Deutomerite: Cylindrical to conical, with a blvint posterior end. 



Epicyte: Well developed, showing a double contour. Longitudinally 

 striated. 



Sarcocyte: Apparently wanting, except for the septum, which is 

 either plane or dips slightly backward. 



