10 S. HATAI. 



Spennati teca. — One pair of spermathecae in segment X, opening anteriorly to the 

 ventral seta-bundles. The saccular* portion is separated from the duct by a deep con- 

 striction. As a whole, it is somewhat club-shaped and sigmoid (fig. 9). Its wall 

 consists of three layers, as in most Limicola', but they are not developed in all parts. 

 The cells lining the cavity of the saccular portion are smaller than those of the duct ; 

 both are cubical and glandular. The muscular layers are well developed, especially 

 in [the duct portion. The organs are uniformly covered with peritonea] cells. 

 Spermatophores are always present in the spermathecae of fully mature specimens. 



Ovary. — One pair of ovaries are attached to the posterior face of septum X/XI, 

 in similar positions as the testes. Each is usually pear-shaped but its form varies 

 according to the degree of sexual development, and assumes a jailmate form when 

 i*i 1 1 1 y mature. The cells are very small in the proximal end, but are very large at 

 the other, where they are surrounded by follicle cells. Mature ova float here and there 

 in the body cavity. 



Oviduct. — One pair of oviducts lie in segment XL The duct is very short and 

 bears a wide funnel, opening internally into the cœlomic cavity of segment XI, and 

 externally in the intersegmental line XI/XII, in similar positions as the spermathecal 

 pores. 



Ovisac. — The ovisac is formed in a similar way as the sperm-sac by the backward 

 evagiuation of sei>tum X/XI, and extends backward to segment XII, on the 

 dorsal side of the alimentary canal. Its minute structure is also like that of the 

 sperm-sac. 



Vatcufor System. 



The main vessels are the dorsal, the ventral, and the supra-intestinal. I shall 

 note only those points in which the present species differ from the known species. 

 Although, unfortunately, I have been able to see only a few original papers relat- 

 ing to this genus, I gather that in all the European species of Lhnnodrilus the 

 contractile hearts lie in segments VIII and IX and the intestinal commissures more 

 anteriorly. In the new species, the segments in question are provided only with 

 enlarged intestinal commissures. This was found to be the case in all the specimens 

 observed (at least 10). I shall now note some points common to the new and the 

 already known species. 



The dorsal vessel divides into two in the prostomium, and these two vessels are 

 directly continued into the ventral vessels running backward along the sides of the 



