40 



ART. 4. — EKITARO NOMURA 



B 



C 



Fig. 30. 



Diagrams showing the shapes 

 of the septal sacs ; A — L. gotoi ; 

 B, C — L. icilleyi. 



the posterior faces of septa V/VI- 

 IX/X. They are of an ovoidal shape. 

 In L. gotoi the sacs of a pair open 

 separately into the cœlom, but in 

 the present species the two sacs 

 unite partially and form a common 

 opening in the ventral median line 

 of the body. Each sac must there- 

 fore be described as lying in the 

 median line and divided into two at 

 the hind end. 



5. Nepheidia. 



The nephridia are present in pairs in all the segments ex- 

 cept I- VI, IX-XII and those of the posterior part of the body. 

 All have the same structure, opening internally in a seg- 

 ment and externally just in front of the ventral seta-bundles of 

 the next following segment. Hatai's description of these organs 

 in L. gotoi refers in reality to those of the present species. 

 According to my own observations, the presence of an ampulla 

 and an end -vesicle appears to be inconstant. The nephridial 

 canal lies in the main mass, which consists of nephridial and 

 peritoneal cells, but there are no ovoidal cells that give rise to 

 the' racemose appearance in L. gotoi. In segment VIII, these 

 cells are often present, but they are only few and scattered. 



6. Nervous system. 



The brain lies in segment I, on the dorsal side of the buccal 

 cavity. As seen from above it is almost square and shallowly 

 notched posteriorly. A pharyngeal nerve (fig. 28, pn) runs out 

 from each posterior corner of the brain, on the dorsal side of 

 the pharynx, and enters the latter at the very commencement of 

 the pharyngeal glands, between the lateral and outer dorsal glands. 

 From the anterior part of the brain run out two strong lateral 



