NO. 2258. 



TAENIOID CESTODES OF DOGS AND CATS— HALL. 



67 



is much looped; it lies just anterior of the ovary and pursues a fairly 

 straight course, aside from the loops, to the cirrus pouch. In young 

 segments the cirrus pouch has the shape of an hourglass, widened 

 proximally and distally and constricted mediall}'; in mature seg- 

 ments it is piriform. It extends to the longitudinal excretory canal, 

 but does not cross it. 



Female genitalia. — Each ovary (fig. 66) consists of two distinct 

 lobes, each of a loose, irregular structure, the lobe toward the median 

 side of the segment following the convexity of the curve of the vagina 

 in a roughly crescentic outline, and the one toward the lateral side of 

 the segment lying in the concavity of the curve of the vagina in a 

 roughly circular outline. The ovaries lie mostly posterior of the 

 genital pores. The vitellaria are relatively 

 compact reniform structures lying posterior 

 of the ovaries, and each vitellarium is about 

 as large as one of the two principal parts of 

 each ovary. The shell-gland is a relatively 

 large and compact reniform structure between 

 the ovary and the vitellarium and displaced 

 toward the median line. In young segments 

 the vagina passes almost straight medially; 

 in mature segments it is very slightly wavy in 

 the lateral field of the segment and then 

 curA'es posteriorly after crossing the excretory 

 canal to form a spindle-shaped receptaculum 

 seminis in the very narrow curved field be- 

 tween the tw^o principal portions of each 

 ovary. The uterus is only seen in later seg- 

 ments and is a fine tubular reticulum branch- 

 ing through the median field and especially 

 distinct between the ( ? female) genitalia 

 and posterior of these. After the constric- 

 tion of some parts it forms egg capsules containing 2-3-8-15 eggs 

 to a capsule. The eggs are spherical and are 21 [j, in diameter. The 

 densest clumps of eggs are posterior of the oviducts, where the 

 capsules form almost a connected network and may lie lateral of the 

 longitudinal excretory canals. 



Host. — Primary: Cants famUiaris. 



Location. — Small intestine. 



Localities. — Hungary (Budapest) ; United States (Bethesda, 

 Maryland; Detroit, Michigan). 



Life history. — Unknown. 



This species, reported for the first time from the United States by 

 Hall (1917), the second record of its occurrence, was collected by the 

 writer from a dog shipped from Fallon, Nevada, in 1910, and exam- 



FlG. Gil.— DiPYUDIUM SEXCORO- 



NATUM. Mature segment. 

 Enlarged. After von RAtz, 

 18000. 



