ON THE ORGANIZATION OF THE GENU3 GREGARINA OF DUFOLR. 239 



Whole length from the 1.300th to the 1.70th in. 

 Breadth from 1.600th to the 1.130th in. 

 Cephalic sac from 1. 1140th in. to the 1.250th in. 



Habitation. — Provcntriculus of Achcta abbreviata. Tlic same species I have observed 

 in two instances on the exterior of the ventriculus, free within the abdominal cavity. 

 Movements. — Very slow. 



6. Gregarina Locust.f. Carolinje. 



Opaque, white, with or without a probosriiliform appendage. 



Cephalic sac hemispherical, without papillary thickening of the integument, or occasionally with a pyramidal 

 enlargement or extension anteriorly, terminating in a round or oval proboscidiform prolongation, fringed with 

 delicate, membranous digitations at the free extremity, or with an apparent depression of the parietal integument, 

 and a slight conical protrusion of the interior granular mass, which latter is opaque. Partition between the con- 

 tents of the cephalic and posterior sac very thin. 



Posterior sac oblong oval, or spatulatc; posteriorly obtuse; granular contents, opaque; interior corpuscle trans- 

 parent, with several nuclear bodies. 



Whole length from the 1.100th to the 1.00th in. 



Breadth from the 1.200th to the 1.120th in. 



Cephalic sac from the 1.100th to 1.320th in. long; from the 1.270lh to the 1.178th in. broad. 



Corpuscle, in largest, 1.2800th in. diameter; nuclei 1.3500th in.; nucleoli 1.7000th in. 



Habitation. — Intestine of Locusta Carolina. 

 Movements. — None observed. 



7. Gregarina Blatt.e orientalis. 



Robust, milk-white, opaque. 



Cephalic sac hemispherical, with a slight papillary thickening of the integument; contents opaque white. 

 Partition between the cephalic and posterior sac thin. 



Posterior sac broad ovate, or panduriform, subacute posteriorly; contents opaque, obscuring the interior cor- 

 puscle. 



Whole length avenge 1.60th in.; breadth 1.125th in. 



Cephalic sac 1.260th in. long; 1.178th in', broad at the base. 



Corpuscle 1.275th in diameter. 



Muscular stria? 1.10.000th in. apart. 



Habitation. — Within the intestine, and without closely applied to its parictes, in Blatta 

 orientalis. 



Movements. — The movements of this species are moderately active. 



