488 W. N. F. WOODLAND 



the short region intervening between the Kopf and the anterior 

 limit of the testes and vitellaria ; and (3) the ' Kumpf ' or 

 remainder of the body containing the genitaha ; but the 

 so-called neck region is very ill-defined in any species of 

 Caryophyllaeus and ceases to exist when the head is 

 contracted, so that in many cases the body is simply divisible 

 on this system into the head and the trunk regions. Since in 

 W. virilis a new and conspicuous post-ovarian region is de- 

 veloped (PI. 24, fig. 2) — a region inconspicuous in all previously 

 described Caryophyllaeida e — I propose to dispense with 

 the old ' trunk ' region and subdivide the body of W. virilis ^ 

 into the four distinct regions which are obvious even to the 

 naked eye : (1) the head (including the ' neck ' when present) ; 

 (2) the testicular region, extending from the most 

 anterior testes to the genital openings and containing the testes 

 and anterior vitellaria ; (3) the dilated and therefore conspicuous 

 uterine region, extending from the genital apertures to 

 the hind end of the ovary and containing the uterus, ovary, 

 shell-gland, ootype, and the middle portions of the two elongated 

 vitellarian strands ; and (4) the p o s t - o v a r i a n region 

 (PL 24, fig. 2, povr), composing the rest of the body and con- 

 taining the posterior more or less scattered vitellaria. The 

 broad ovoid uterine region is plainly visible with the naked 

 eye and is the region of maximum breadth. 



In a specimen measuring 16 mm. in length the head was 

 2 mm. long and 1-3 mm. broad at the base, the testicular 

 region was 2-2 mm. long and 1 mm. broad, the uterine region 

 3-5 mm. long and 1-5 mm. in maximum breadth, and the post- 

 ovarian vitellaria extended nearly to the end of the body, 

 i.e. for nearly 8 mm. In my largest specimen (52-5 mm. long, 

 PI. 24, fig. 1, a) the head was 2-1 mm. long and 1-1 mm. broad 

 at the base, the testicular region was 10 mm. long and 2 mm. 

 in maximum breadth, the uterine region 7 mm. long and 

 2-5 mm. in maximum breadth, and the post-ovarian vitellaria 

 only extended about half-way down the remainder of the body, 



^ This regional subdivision will, of course, apply to the body of all species 

 of Caryophyllaeids. 



