1890.] NATURAL SCIENCES OF PHILADELPHIA. 417 



the bothria 0"375 mm. ; the rostrum with its double circle of hooks 

 0'375 mm. Submitted by Dr. H. C. Chapman. 



29. Cysticercus pisiformis Zeder.=Larva of Taenia serrata Uoeze. 



Numerous sacs simple and compound, ranging from 2 to 3 cent- 

 imeters in diameter, with worms isolated and in groups in various 

 stages of development. One large sac contained a dozen groups ad- 

 herent to the inner surface ; the groups with from 6 to 30 worms, 

 opaque yellowish, obconic from 4 to 6 mm. long by 1'5 mm. thick ; 

 with head and neck retracted nearly the length of the rest of the 

 body which is transversely corrugated. Bothria 0"225 mm. ; 

 rostrum 0"3 mm. broad ; upper hooks 0*14 mm. long, lower ones O'l 

 mm. long. 



From the peritoneal cavity of the Jack Rabbit, Lepus palustris, 

 from northern Minnesota. Submitted by Mr. Horatio C. Wood. 



30. Taenia nematosoma n. s. 



Head rounded quadrate, unarmed, with equidistant hemispherical 

 bothria and a small central papilla ; neck short or none ; fore part 

 of body linear ; anterior segments much wider than long ; posterior 

 segments gradually becoming proportionally longer, quadrate or bar- 

 rel-shaped ; genital apertures marginal and alternating irregularly. 

 Length to 9 inches, contracting to about one half. Breadth of head 

 0"375 to 0*5 mm.; bothria 0*175 wide; neck 0*25 wide; anterior 

 segment an inch from the head O'llo mm. long by 2 mm. broad ; 

 posterior segments 0"75 mm. long by 2 mm. broad and when con- 

 tracted, widening to 2"5 mm. Ova spherical, 0'028 to 0*032 mm. 



A half dozen specimens in the stomach of two Pickerels, Esox: 

 retmdatus. 



31. Tetrabothrium triangulate Diesing ? 



Head large, oblate spheroidal and formed by four large bothria; 

 neck short or none ; anterior segments of the body transverse linear, 

 then oblong square, the posterior segments short companulate ; 

 genital apertures marginal. 



Several inches in length ; described from fragments of several in- 

 dividuals. Head 0*55 mm. long by 0*75 mm. broad ; bothria 0*5 ; 

 neck 0*3 wide: body 1 5 mm. behind the head indistinctly segmented and 

 0*125 mm. wide. In a fragment without the head, about an inch 

 long, the anterior segments are oblong square Avith prominent 

 marginal genital apertures and 0*3 mm. long by 0*25 mm. wide ; the 

 posterior segments 0*175 mm. long and 0*2 mm. wide. In a posterior 



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