44 



ART. 4. — EKITARO NOMURA 



5). Ovaries. One pair of ovaries lie attached to the posterior 

 face of septum X/XI, close to the nerve cord. 



6). Ovisac. It is an outgrowth of septum XI/XII and ex- 

 tends posteriorly sometimes into segment XVII, on the dorsal 

 side of the intestine. 



7). Oviducts. One pair of oviducts lie in the intersegmental 

 line XI/XII, in the same longitudinal line with the male openings. 

 The funnel of each duct opens widely into the cœlomic cavity of 

 segment XI and the duct is very short. 



8. Vascular system. 



The arrangement of the principal vessels is the same as in 

 L. gotoi. One pair of contractile hearts lie in segment VIII. As 

 to the commissural vessels, it is to be noted that those of seg- 

 ment X are very well developed, and undergo convolutions in the 

 cœlomic cavity, in which float numerous sperm- cells. Blood cor- 

 puscles are very numerous. 



Comparison of i. gotoi and L* tvilleyi. 



The more prominent differences of the two species treated of 

 in this paper may be shown in a tabular form, as follows. 



L. gotoi. 



*The anterior segments are divided 

 into two annuli, a shorter anterior 

 and a longer, seta-bearing posterior. 



*The branches of a seta are of 

 nearly equal length. 



The cell boundaries of the hypo- 

 dermis are absent. 



The pharyngeal glands are very 

 feebly developed. 



The chloragogue cells measure 35- 

 50 jj. long. 



*'lhe anterior nephridia are of 

 racemose appearance. 



L. ivilleyi. 



*The anterior segments are divided 

 into two annuli, a longer seta-bearing 

 anterior and a shorter posterior. 



*The branches of a seta are of 

 unequal lengths. 



The cell boundaries of the hypo- 

 dermis are distinctly present. 



The pharyngeal glands are very 

 well developed. 



The chloragogue cells measure 50- 

 100 fj. long. 



*The anterior nephridia are not 

 of racemose appearance. 



