34 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. 



an elongated seminal receptacle (fig. 23, sem. recept.) which extends 

 first inward toward the median line, and then diagonally backward 

 and inward toward the female glands, which are located in the 

 median line close to the posterior border of the segment. 



The ovary, which is very small and compact, measures about 100/* 

 in diameter and is near the median line in the ventral half of the 

 segment near the posterior border. Ventral of the ovary is the yolk 

 gland, about 80/* in diameter. A definite shell gland was not seen. 



The uterus (figs. 23, 24, 26, ut.) develops immediately in front of 

 the ovary in the median line. It is a simple sac-like organ slightly 

 irregular but somewhat spherical in shape. In front of the uterus 

 the parenchyma becomes modified to form a para -uterine organ (fig. 

 26, par. vt.) with bulbous anterior end, which extends forward in the 

 median line nearly to the anterior border of the segment. The con- 

 tents of this organ before the eggs have entered it present the usual 

 fibrous appearance. 



The eggs, which are oval in shape, have three membranes, an outer 

 one, very thin, about 45/* in diameter, a thicker prominent middle 

 membrane 30 to 38/* in diameter, and a thin inner membrane closely 

 investing the oncosphere, which measures 25 to 30/* in diameter. 



Genus ANONCHOT^^NIA Cohn, 1900. 



(For generic diagnosis, see p. 86.) 



ANONCHOTiENIA GLOBATA (Linstow, 1879). 



Fig. 27. 



Some specimens of tapeworms (No. 3027, Helminthological Collec- 

 tion, Bureau of Animal Industry) collected in Maryland from Den- 

 droica sPnata and others (No. 5955, Helminthological Collection, U. S. 

 Nat. Mus.) collected in Maryland from Melospiza melodia agree very 

 closely with the published descriptions of Anonchotcenia globata., and 

 I have accordingly identified them as belonging to this species. 



External anatomy. 



The length of these specimens is from 20 to 30 mm., and the maxi- 

 mum breadth is about 1 mm. The head is rounded, without rostellum, 

 and measures 500 to 650/* in diameter. The suckers are about 230/* 

 in diameter. Cohn (1901b) states that a neck is absent, segmentation 

 beginning immediately behind the head. In the specimens wdiich I 

 have examined, however, there is an unsegmented region immediately 

 behind the head measuring 0.6 mm. in width by 1.5 to 2 mm. in length. 

 Fuhrmann (1908c, p. 625) has also noted that the neck is relatively 

 long. The first segments are very short ; the final segments nearly as 



