NO. 2258. TAEXIOID CESTGDES OF DOGS AND CATS—HALL. 53 



erally, and so lies close to the succeeding segment iixstead of pro- 

 jecting and forming a prominent angle and thus giving a serrate 

 appearance to the strobila. In older segments, the posterior seg- 

 ment margin is prolonged to form an infundibuliform portion which 

 surrounds the anterior portion of the succeeding segment (fig. 54). 

 In a naked eye inspection of the strobila this prolongation is seen 

 as a pale, fairly wide band separating the segments, whereas most 

 related tapeworms show a narrow depression between adjacent seg- 

 ments. The genital papilla is very prominent and is situated posterior 

 of the middle of the segment, sometimes slightly posterior and often 

 very much posterior, even practically at the posterior edge of the 

 lateral border; it is very rarely in the middle of the segment. The 

 genital cone is frequently set very deep at the bottom of the genital 

 pore. The genital primcrdia appear almost immediately behind the 

 neck as densely staining areas in the median line. Farther back on 



Fig. 54.— MULTiCEPS SERIALIS. MaTUJIE segment. K^^LAR,GED. 



the strobila the genital canals and the median stem of the uterus 

 develop as outgrowths from this central area. 



3Iale genitalia. — The testes (fig. 54) are numerous and set close 

 together throughout the testicular field. In the segments in which 

 they first appear they do not occur in the field of the median stem 

 of the uterus, but subsequently this field is invaded, as is also the 

 field of the vas deferens and vagina. They extend in intimate con- 

 tact with the lateral margins of the ovaries to the vitellarium and 

 posterior of the ovaries. Anterior of the ovaries there is an ap- 

 proximately square field free from testes, the lateral testicular fields 

 being connected by a rather straight band of testes crossing the an- 

 terior portion of the segment. The vas deferens apparently origi- 

 nates at some distance from the median stem of the uterus on the 

 pore side of the segment and is apparently very little looped. The 



