CESTODARIA 447 



about 0-7 mm., the uterine region nearly 1-5 mm., and the 

 post-ovarian region about 0-46 mm. 



Notable features concerning the genitalia are (1) the very 

 long uterus, extending over twice the distance covered by the 

 testis mass ; (2) the position of the ootype (ootp) on the left 

 side and the initial coils of the uterus on the right side of the 

 ovary ; and (3) the opening of the uterus into the vagina from 

 the left side (PI. 24, tig. 23, is viewed from the ventral aspect), 

 i.e. exactly the opposite of what occurs in the two preceding 

 species ; ^ (4) the breadth of the lateral rows of vitellaria ; (5) the 

 extension posteriorly of the testes to about the level of the 

 genital openings ; and (6) the apparent anterior extension of 

 the ovary on each side to near the level of the genital apertures 

 (though of this I am not quite certain, owing to the difficulty 

 in my preparation of distinguishing the vitellaria from the 

 ovarian follicles). 



The two main nerve-trunks are visible anteriorly, and the 

 excretory opening posteriorly. 



The eggs are of the usual ovoid type and measure, when 

 mounted in balsam, 32-9-40-2 microns in length and 20-1- 

 25-6 microns in breadth. 



The specific characters of W. mi nut a will be stated below. 



Caryophyllaeus filiformis, sp. nov. Woodland, 1923. 



Of this species (PI. 25, fig. 24) I possess altogether thirty-one 

 entire mounted specimens, and several in transverse and longitu- 

 dinal sections. This parasite was found in the well-known Nile 

 fish, Mo r my r us caschive, L. (a Malacopterygian), at 

 Khartoum, presumably in the intestine. Most of my specimens 

 are mature, and these vary in length from 7-5 mm. to 24 mm. 

 One or two smaller than this (circ. 5 mm.) do not appear to 

 have eggs in the uterus. The usual maximum breadth is 1 mm., 

 but occasionally the body may locally expand to as much as 



^ I at first concluded that I had viewed the specimen ' wrong way up ', 

 but re-examination proves that these statements are correct. I lay no 

 stress on these differences, since it is more than possible that the arrange- 

 ment of these ducts is variable in different individuals. 



