524 F. W. GAMBLE AND J. H. ASHWORTH. 



nuclei of its cells^ stains deeply with liaBmatoxylin, carmine, 

 etc. (PL 26, figs. 46, 48), Only one of these strands {Gen. 

 Str.), the longer one nearer the middle of the body of the 

 animal, gives rise to gonads. The other strand (C Str.), 

 which is shorter, often bears small heaps of cells produced by 

 proliferation of the strand ; these possibly give rise to coelomic 

 corpuscles. 



Both these strands are present on the first pair of 

 nephridia of this species, but the genital strand in these 

 nephridia always remains small and thin, being discernible 

 as a thin covering on the inner side of the gonidial vessel, 

 and never giving rise to gonads. In the posterior nephridia 

 of a young female specimen about 120 mm. long the gonad 

 very much resembles that of an adult A. Grubii. It is a 

 cylindrical mass of cells, thickened somewhat posteriorly, 

 surrounding the gonidial vessel for a distance of about 

 1*5 mm. behind the nephrostome. It is not possible to say 

 with certainty from an examination of this gonad whether 

 the cells will give rise to ova or spermatozoa. The gonads 

 of the anterior nepbridia of this specimen are rather more 

 advanced, and they already show young ova. 



In adult specimens the genital strand runs from its point of 

 origin on the funnel, parallel with, and closely applied to, the 

 secretory portion of the nephridium along its whole length. 

 From this strand, Avhich is traversed axially by the gonidial 

 vessel, the large genital organs of the adult are produced. 



In the female the genital strand soon gives rise to a few 

 digitiform outgrowths, which at first are small, blunt, and 

 conical, but later they become more numerous (there may be 

 twenty to thirty), elongated and flattened, or filiform, attain- 

 ing a length of 8 to 5 mm. (PI. 25, fig. 45, and PI. 26, fig. 46). 

 At first the cells of these processes, which are obviously 

 young ova, are nearly equal in size, being about 15 /u in 

 diameter, and having large vesicular nuclei. In old speci- 

 mens, however, each process bears ova in every stage of 

 development, from the smallest recognisable to the almost 

 ripe ova, which are surrounded by their thick conspicuous 



