Vermes. 167 



margins of this fossa show a slight inward convexity, but are 

 not specially swollen, whereas the longitudinal margins, which 

 overhang the fossa, are in fact the ventral end of a pair of large 

 glandular swellings which are also visible from the dorsal side, 

 where they gradually disappear near the outermost setoe (d). The 

 whole has much the appearance figured by Akira Jizuka for 

 P. matsushimensis. The male openings are difficult to see, lying 

 in the fovea at the base of the ovex'hanging walls, approximately 

 in a line with the outer ventral seta [h). 



A deep slit-like sucker, with pale, somewhat raised margins, lies 

 ventrally on the intersegmental furrow between segments 19 and 

 20, reaching laterally the line of the innermost ventral setas. 



The oviducal openings are two minute pores on the anterior part 

 of segment 14, alaiost in a line (though a little ventrad) with the 

 innermost ventral setaj («). 



The spermathecal pores are on small projecting tubercles between 

 segments 7-8 and 8-9, on a line with the outer ventral sette {h). 



There are no dorsal pores. The nephridio- pores lie at the level 

 of the outer ventral setre, but I could not determine which segment 

 bears the first of them. 



Septa o-H to 8-9 inclusive are thin; the following, 9-10, 10-11, 

 11-12, and also, but to a less degree, 12-13, are thickened. 



A gizzard is not recognizable; but septum 6-7 is more deeply 

 infundibulate than its neighbours, and we may connect this with 

 the earlier existence of a gizzard in the 6th segment. There 

 are no calciferous glands; the intestine begins behind the 18th 

 segment, perhaps in 16 or 17. 



The hearts occupy segments 11, 12, 13, the last being the 

 largest. 



The two pairs of large spermathecaj belong to segments 8 and 9 ; 

 each spermatheca consists of a pyriform pouch not distinctly 

 marked off from its duct, and of a narrow tubular diverticule 

 which is longer than the main pouch. 



The broad grape-like ovaries are readily seen in segment 13, as 

 well as the testes in segments 10 and 11, all these gonads being 

 attached to the anterior septum on each side of the neurochord. 

 In front of the gonads, that is, on the anterior face of septa 10-11, 

 11-12, and 13-14, the funnels of both pairs of vasa deferentia and 

 of the oviduct are plainly visible. 



The small sperm-sacs in segments 11 and 12 have a botryoidal 

 appearance. 



The prostates occupy segments 10, 17, and 18, and recall very 

 nearly those of P. insularis (Eosa). Their glandular portion has 

 the appearance of a large sausage - like body, formed by the 

 apposition of the several parts of a slightly - coiled lesser duct. 

 The muscular duct which arises from the front end of the glandular 

 tube is moderately bent, with the convexity inwards, and gradually 

 increases in diameter as it proceeds backwards, reaching at last the 

 external openings on the 18th segment. 



