TWO AQUATIC OLIGOCHiETES. 



sp-- 



VI 



VII 



VIII 



IX 



X 



XI 



XII 



xin 



XIV 



xv 



XVI 



length 80-100 mm. Number of segments 

 100-180. Hab.— Morioka ; Tokyo ; Kago- 

 shima. 



2. Anatomy and Histology. 



The minute structure of L. loilleiji 

 is closely similar to that of L. gotoi, but 

 there are some differences between them, 

 aside from the main characters of 

 systematic importance above mentioned. 

 Materials were killed, after narcotising 

 with chloretone which is better than 

 alcohol, in Perenyi's fluid. The cells are 

 generally larger than in L. gotoi. 



1. Body wall. 



The body wall consists of five 

 layers. Segments I-V are always bian- 

 nulate, the anterior annulus being longer. 

 A similar inequality of the two annuli 

 is described by Michaelsen in L. udéke- 

 mianus. The prostomium is conical and 

 bluntly pointed. 



The cuticle is thinner than in L. 

 gotoi, being less than 1 p. thick, and 

 covers the whole body. 



Fig. 2S. 



L. w'dleyi. Diagram showing the principal organs. 

 Behind segment V the intestine is omitted, prg — prostomial 

 ganglion, br — brain, phr — pharynx, oes — oesophagus, pg — 

 pharyngeal gland, ch — chloragogues, sgi_5— septal sacs, ani.2 — 

 anterior nephridia, ht — heart, as — anterior sperm-sac, te — 

 testis, sp — spermatophore, sth — spermfitheca, ov — ovary, sd — 

 sperm-duct, ps — posterior sperm-sac, od — oviduct, os— ovisac, 

 pni_i— posterior nephridia. 



