RESEARCHES IN HELMINTHOI.OGY AND PARASITOLOGY. 205 



0.375 wide, or 0.25 long by 0.75 wide; widest segments reversed 

 crateriform, 0.5 long by i wide, or 0.3 long by 1.25 wide, or 0.25 

 long by 1.5 wide; posterior segments campanulate, 0.375 ^ong by 

 0.625 wide, or 0.5 long by i wide, or 0.75 long by i wide. 



In a much contracted specimen 1 52 inches long, with the widest 

 part 1.75 mm. broad and proportionately thickened, the head was 

 0.4 wide, the neck 0.25, the anterior cup-like segments 0.15 long by 

 0.2 wide ; the posterior widest and thickest part with segments 0.25 

 long by 1.75 wide ; the posterior companulate segments 0.75 long 

 by I wide. In another much contracted specimen 30 mm. long the 

 head was 0.325 mm. wide ; the short neck 0.225 wide ; the widest 

 part with segments 0.3 long and 1.625 wide ; the terminal segments 

 0.375 long by 1.25 wide. In a much elongated specimen of 2}4 

 inches the head was 0.375 mm. wide ; the neck 0.2 wide ; the an- 

 terior cup- like segments 0.2 long and 0.375 wide; succeeding seg- 

 ments 0.25 long and 0.75 wide ; next 0.75 long by i wide, and ter- 

 minal ones 0.5 long by 0.8 wide. 



In some fragments with broad segments the genital apertures 

 were seen to be distinctly marginal and with a small penis having 

 the summit protruding. 



Tcenia simpla. — Head short, transverse discoid or hemispherical, 

 slightly prominent or depressed at summit, unarmed ; bothria 

 spherical, occupying the four corners ; neck none ; body at com- 

 mencement variably narrower than the head ; anterior segments 



1 



Fig. 18. — Tcenia simpla ; anterior part of body. 40 diameters. 



linear, becoming gradually longer and broader and decidedly cam- 

 panulate. Many fragments, from which the worm is estimated at 

 about 18 lines. 



Intestine of the Chuck-will's-widow, Antroslormcs carofinensis. — 

 Head, 0.2 mm. wide, o.i long. Body succeeding head, 0.175 mm. 

 wide. Campanulate segments, 0.375 long by 0.5 wdde ; subse- 

 quently same length and double width. Some of widest segments 

 0.25 mm. long by 1.25 wide. 



TcE7iia aurita, Rudolphi. — Head urn-like or doubly conical, summit 

 armed with a double circle of alternating hooks, long and short ; 

 bothria lateral, spheroidal, neck obconic ; body long, clavate, widen- 

 ing behind and abruptly rounded at the end ; anterior segments lin- 

 ear, then linear campanulate, and then more strikingly campanulate 



