387] ANOPLOCEPHALIDJE—DOUTHITT 37 



teristic of the Linstowiuae and has been observed nowhere amongst the 

 Anoplocephalinae, except possibly in the genus Triplotaenia. It should 

 be stated however that the identification of right and left sides in these 

 specimens may be in error. 



Still another interesting feature was observed in regard to the 

 genital ducts. The vagina crosses the cirrus pouch ventrally in most 

 cases; but in the two individuals mentioned in the paragraph above, 12 

 of the proglottids that had the excretory ducts dorsal to the genital 

 ducts, had the vagina dorsal and the cirrus pouch ventral. This recalls 

 at once Moniezia in which the vagina is regularly ventral to the cirrus 

 pouch on the right and dorsal on the left. These same two individuals 

 were unusual in the form of the ovary, as explained below. The cirrus 

 pouch is very large. Before the evagination of the cloaca it lies usually 

 entirely mediad of the excretory ducts; but when the cloaca is everted 

 it may lie entirely laterad. In mature proglottids it is 275 to 370/a 

 long, and 120 to 24(hi broad. Before the development of the vesicula 

 seminalis it may be elongated and spindleshaped ; afterwards it is al- 

 ways pearshaped. The cirrus is straight in the lateral half of its 

 length and has usually two spiral turns at its upper end. It is lined 

 with many hundreds of small hooks which are arranged in spiral rows. 

 The median end of the cirrus pouch is occupied by a portion of the 

 vesicula seminalis. Proximad and mediad of the pouch is a second 

 portion, 140/a long, which is only slightly coiled. This portion is thickly 

 beset with glandular cells. Beyond the seminal vesicle the passage 

 narrows and soon divides, sending a branch to either testicular field. 



The testes, 70 to 110 in number, are dorsal and posterior. They 

 occur in both lateral halves but are mostly on the side away from the 

 pore. At either side they are grouped two or three deep dorsoven- 

 trally. Above the yolk-gland there is never more than a single layer 

 and as often as not there are none here, the testes being separated 

 into two groups. The testes are typically spherical in shape, averaging 

 35/i. in diameter. 



The vagina communicates with the genital cloaca on the anterior 

 surface of the latter. It extends forward and somewhat mediad in 

 front of the cirrus pouch then turns directly toward the median line, 

 usually crossing the cirrus pouch ventrally. Mediad of the cirrus pouch 

 it curves somewhat distad, the entire vagina thus describing a semi- 

 circle. Its middle portion in the anterior part of the proglottid is 

 several times the diameter of the two ends. The surface is glandular. 

 At about the same level as the lateral end is located the receptaculum 

 seminis which is a simple expansion of the vagina, measuring 180 by 



