CESTODARIA 445 



111 my largest specimen (84-5 mm.) the head measm-ed 8-o mm. 

 in length, the testicular region 11 mm., the uterine region 

 13-5 mm., and the post-ovarian region 6-5 mm. In the 26 mm. 

 specimen the head was 4 mm. long, the testicular region 

 measured about 10 mm. long, the uterine region 6-5 mm., and 

 the post-ovarian region 5-5 mm. In the 17-5 mm. specimen 

 the head was 2-5 mm. long, the testicular region 7-5 mm., the 

 uterine region 5 mm., and the post-ovarian region 2-5 mm. 

 There is thus some variation as regards the lengths occupied, 

 relative to the entire body-length, by the several regions. 



The head region appears to be practically constant in form 

 and continuous with the testicular region. In transverse and 

 longitudinal sections (PI. 24, figs. 18, 19) it is seen that the 

 subcuticula is not creased longitudinally, as in W. virilis, 

 both the cuticle and subcuticula being thin. The longitudinal 

 musculature (lmus) also is not nearly so pronounced as in 

 W . virilis, but, as in W . virilis, consists of a single outer 

 zone. Transverse (trmus) and dorso-ventral (dvms) muscle- 

 fibres are also easily seen. 



In the testicular region there is nothing calling for special 

 comment, save that the testes end w^ell in front of the cirrus 

 pore — they do not extend behind as in W . v i r i 1 i s — and that 

 the vitellaria do not extend so far forward as the testes. In 

 some of my preparations the vitelline duct, which lies internal 

 to the vitellaria on each side of the body, is very distinct. 



In the uterine region it is seen (PI. 24, figs. 17, 20) that the 

 uterus is not nearly so voluminous as in W . virilis, and is 

 much shorter, relative to the body-length. The ovary is more 

 attenuated than in W. virilis, and its exact limits are not 

 easy to ascertain ; the vitelline strands are also very thin. 

 The detailed conformation of the ducts in the regions of the 

 genital openings and ovary are similar to that found in 

 W . virilis. 



The post-ovarian region is much shorter relative to the body- 

 length (PI. 24, fig. 17) than in W. virilis, and the vitellaria 

 largely retain their marginal strand arrangement, otherwise 

 it is similar to that in W . virilis. 



