22 



ART. 4.— EKITAEO NOMURA 



Fig. 11. 



L. gotoi. Ventral view of the 

 anterior end of the body, showing 

 the blood vessels; reconstructed. 

 xlOO. 



Fig. 12. 



A portion of the intestinal 

 vascular network. siv — supra- 

 intestinal vessel. 



3). The supra-intestinal vessel 

 is always attached to the dorsal side 

 of the intestine. It originates as a 

 branch of the dorsal vessel in seg- 

 ment V, and opens again into the 

 dorsal vessel at the posterior part of 

 the body. A small vessel is given 

 off from it anteriorly to the alimentary 

 canal before it opens into the dorsal 

 vessel in segment V. 



4). Two forms of commissural 

 vessels are found : 



a. The intestinal networks con- 

 nect the supra-intestinal with the 

 ventral vessel. They are well de- 

 veloped in all the segments behind 

 the fifth. These networks are con- 

 nected with both the supra -intestinal 

 and ventral vessels at the middle of 

 a segment, there being sometimes 

 several connecting vessels. In the 

 posterior segments, they are connected 

 with the dorsal instead of the supra- 

 intestinal vessel ; otherwise the ar- 

 rangements are the same as in the 

 anterior segments. In segments II- 

 IV, the intestinal vascular networks 

 are very weakly develeped. 



b. One pair of commissural 

 vessels of another sort lie in each 

 segment. They have no direct con- 

 nection with the alimentary system 

 and may be subdivided into two 

 categories : the coclomic vessels and 

 the integumentary vessels. 



i). The cœlomic vessels are pre- 



