54 ILLINOIS BIOLOGICAL MONOGRAPHS [272 



tion. Cirrus pouch extending from this point into the beginning of the 

 second body third, being approximately one-third the length of the entire 

 body. Vagina two-thirds the length of the cirrus pouch. The much lobed 

 testes are situated in the posterior end, external to the intestinal crura. 

 Ovary irregularly lobed, on a level with and between the testes, intracecal 

 in position. Vitellaria extracecal, anterior to the testes, extending to the 

 middle of the body. 



Habitat: Intestine Host: Arvicola riparius 



Locality: Maryland Collector: A. Hassall 



Date: 1892 No. 5773 U.S.N.M. 



Habitat: Intestine Host: Fiber zihethicus 



Locality: Baker Lake, Washington Collector: H. E. Metcalf 

 Date: August 13, 1915 No. 15.120 Ward collection 



The description of Barker and Laughlin while adequate states that the 

 intestinal ceca are simple. A careful examination of the material at hand 

 shows small, short diverticula both externally and internally throughout 

 the length of the ceca. The writer has not had opportunity to study 

 the material described by Barker and Laughlin. 



CATATROPIS Odhner 1905 



Body elongate, anterior and posterior ends usually equally rounded. 

 Anterior half of ventral surface covered with three rows of non-protrusible 

 papillae; median row set on a ridge or keel; lateral rows each containing 8 

 to 12 glands. Vagina strongly developed, usually as long as the cirrus 

 pouch. 



This genus was created by Odhner to hold Catatropis verrucosa (Fro- 

 lich) which Odhner found to differ from Notocotylus in the character of 

 the ventral glands, those of Notocotylus being protrusible while those found 

 in Catatropis verrucosa were very much reduced, being in the form of a 

 median ridge or keel in the median row and small embedded papillae or 

 glands in the outer rows. It is similar to Notocotylus in its inner organiza- 

 tion and differs from that genus in the fact that the ventral glands are not 

 protrusible. 



CATATROPIS FILAMENTIS Barker 1915 



Syn: Catatropis fifubriata Barker 1915 



Thin flat worms, gradually tapering anteriorly, 2.2 to 3.3 mm long 

 by . 56 to . 7 mm wide at the level of the testes. Anterior half of the body 

 covered with needle like spines arranged in oblique rows. Three rows of 

 flattened papillae on the ventral surface, 12 to 13 in each row. Oral sucker 

 spherical, 66 to 99 /j. in diameter. Esophagus 105 to 132 ;u in length. 

 Pharynx wanting. Intestinal crura undulating. Testes two to four lobed, 

 external to the intestinal crura. Ovary globular or oval 132ju long by 105 



