RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 243 



terior sac globular, oval, clavate, spatulate, fusiform, or urceolate ; 

 posteriorly obtuse ; parietal integument wrinkled or distended ; 

 granular contents very fine, faint, translucent ; corpuscles, one or 

 two, globular, transparent, very faintly granular. Whole length 

 from the i-ioooth inch to the i-28th inch. Breadth from the 

 i-ioooth to the i -430th inch. Cephalic sac in largest i- 1400th inch 

 long. Corpuscle i-30ooth inch to the i-ioooth inch in diameter. 



Habitation. — Intestine of J^olydesnuis virginiensis. 



Movcfne?/ ts .— Moderate and slow\ 



4. Gregarina Passa/i Cornuti. — White, opaque, in pairs, wrinkled. 

 Cephalic sac hemispherical, without papillary thickening of the 

 integument ; interior granular mass opaque. Posterior sac flaccid, 

 when distended subglobular ; granular contents opaque white, com- 

 pletely obscuring the interior corpuscle. Average length in pair, 

 after distension, i-66th inch ; breadth the i-i33d inch. Cephalic 

 sac i-26oth inch at base; projects from body cell i-533d inch. 

 Muscular lines of the posterior sac i -25000th inch apart. 



Habitation. — Proventriculus of Passat ns cornutus. 



Remarks. — This species is usually found in pairs, the cephalic sac 

 of one applied to the posterior part of the posterior sac of another ; 

 a disposition from which Hammerschmidt refers it to a new genus 

 under the name of Clcpsidrina. A very trifling degree of pressure 

 is sufficient to .separate them from one another. 



Movements. — I never observed any other movement in this Grega- 

 rina than a slight contractile one, commencing at the anterior part 

 of the posterior sac and proceeding backward. 



5. Gregarina Achetce Abbreviates. — White, opaque or translucent, 

 with or without a proboscidiform appendage. Cephalic sac orbicu- 

 lar or oval, without any papillary thickening of the integument, or 

 occasionally with an oval proboscidiform prolongation ; interior 

 granular mass opaque or translucent. 



Posterior sac obconic ; granular contents opaque ; interior cor- 

 puscle transparent. Whole length from the i -300th to the i-joth 

 inch ; breadth from i -600th to the i-i3oth inch ; cephalic sac from 

 I- 1140th inch to the i -250th inch. 



Habitation. — Proventriculus of Acheta abbreviata. The same spe- 

 cies I have observed in two instances on the exterior of the ven- 

 triculus, free within the abdominal cavity. 



Movemeiits. — Very slow. 



6. Gregarina Locusta: Carolince. — Opaque, white, with or without 

 a probo.scidiform appendage. Cephalic sac hemispherical, without 



