206 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



with the posterior border thickened. Length to about 2 inches. 

 Head and neck 0.3 mm. long, 0.2 wide ; narrowest portion of body 

 0.06 to 0.1 mm. wide ; near posterior extremity to i mm. wide. In 

 a small and apparently complete individual of 10 lines, the head was 

 0.225 mm. long ; commencement of the bod}- o. i mm. wide ; three 

 lines behind the head the segments were 0.075 mm. long by 0.25 

 wide; near the middle o. 15 long and 0.75 wide. Terminal segments 

 0.2 long by 0.825 wide to 0.25 long by 0.75 wide. aA. posterior frag- 



rr3 



19 22 



Figs. 19, 20, 21, 22. — Tcenia aurita ; 19, head, 125 diameters; 20, hook, 500 

 diameters ; 21, 22, segments near middle of body, 40 diameters. 



ment of 15 lines had the anterior campanulate segments 0.125 mm. 

 long by 0.5 wide and the posterior segments 0.35 mm. long by i 

 wide. Bothria 0.08 mm. diameter. Long hooks 0.048 long ; short 

 ones 0.028. 



Tcenia unilateralism Rudolphi. — From the intestine of the blue 

 heron, Florida aerulea. Previously described from the same bird 

 from Brazil. Head very small, consisting of four small bothria ter- 

 minating the body, with a minute nail-like rostellum. Neck none. 

 Body rapidly widening from the head. Anterior segments linear ; 

 posterior segments short cuneate, with a minute cylindrical penis 

 projecting from each segment, all on the same side. From the in- 

 testine of the green heron, Bntorides virescens. Many fragments. In 

 the only one with a head, 2 inches in length, the head was 0.3 mm. 

 wide ; the rostellum o. 15 long ; the widest part of the body 3 mm. 



Tcenia Oporornis. — Head hemispherical ; bothria spherical, occu- 

 pying the sides of the former ; neck none ; body at commencement 

 as wide as the head and thence gradually widening to the posterior 

 third and then diminishing. Anterior segments linear and trans- 



