244 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



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 contents of the cephalic and posterior sac very thin. 

 Posterior sac oblong oval or spatulate : posteriorly obtu.se ; granular 

 contents opaque ; interior corpuscle transparent, with several nuclear 

 bodies. Whole length from the i-iooth to the i-6oth inch ; breadth 

 from the i -200th to the i-i2otli inch. Cephalic sac from the i -400th 

 to I -320th inch long ; from the i -280th inch to the i -178th inch 

 broad. Corpuscle, in largest, i -2800th in diameter ; nuclei i-35ooth 

 inch ; nucleoli i -7000th inch. 



Habitation. — Intestine of Lociista Caroliiia. 



Movements. — None observed . 



7. Gregarina lilatta: 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 pan- 

 duriform, subacute posteriorly ; contents opaque, obscuring the in- 

 terior corpuscle. Whole length average i-5oth inch ; breadth i-i 25th 

 inch. Cephalic sac i-26oth inch long; i-i78th inch broad at the 

 base. Corpuscle i -275th inch diameter. Mu.scular striae i-iooooth 

 apart. 



Habitation'. — Within the intestine, and without closely applied to 

 its parietes, in Blatta orientalis. 



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



Note. — For further information relative to the Gregarina of 

 Leidy, refer to page 225 and bibliography 599, also to an article by 

 Crawley, Proc. A. N. S., 1903. 



On the organization of the genus Gregarina of Dufour, Trans. 

 A. P. S., 1853 ; read 1851. 



[No. 100. See Bibliography.] 



SOME OBSERVATIONS ON NEMATOIDEA IMPERFECTA AND DESCRIP- 

 TIONS OF THREE PARASITIC INFUSORI/E. 



I. Neniatoideuni cavitatis abdominis Passali cornuti (pi. 11, figs. 

 42-45). This worm is found in the abdominal cavity of the Pa.ssalus 

 cornutus, among the intestines and rete adiposa in about nine-tenths 



