224 OLIGOCHAETA 



I have already gone into this matter in describing the characters of the family 

 Lumbriculidae, and need not recur to it here. 



Attached to the anterior septum of the tenth and eleventh segments, and in the 

 latter case close to the testes, are two pairs of bodies, called 'albumen-glands' by 

 EiSEN. Their walls are delicate and muscular, and their cavity is subdivided by 

 anastomosing trabeculae derived from the walls ; the interspaces thus formed contain 

 loosely-packed cells, which suggest coelomic cells. I could find no duct leading to the 

 exterior, and the fact that the sac on one side of the body contained one of the 

 diverticula of the spermatheca suggests its coelomic character. I should be disposed to 

 compare these sacs broadly to the sperm- sacs, septal sacs, &c. 



Sutroa rostrata, Eisen. 



S. rostrata, G. Eisen, Mem. Calif. Acad. Sci. (1888), vol. ii. No. i. 

 Definition. Length 75 mm. ; ventral vessel forks in segment VIII ; only connected with 

 dorsal vessel in prostominm. Cocoon not pointed at ends. Hob. — San Francisco^ in lake 

 50 ft. above level of sea. 



Sutroa alpestris, Eisen. 

 S. alpestris, G. Eisen, Zoe (189a), vol. ii. p. 333. 

 Definition. Length about 40 mm. ; ventral vessel forked in segment VI, connected with dorsal 

 vessel by perigastrics in each segment. Cocoon globular and pointed at ends. Hob. — 

 California, Bonner Lake, 6,000 ft. 



Genus Alluroides, Beddard. 



Definitiobt. Setae simple ; male pores on XIII ; oviducal pores, XIII/XIV ; penes 

 on XIII in front of male pores ; testes in X ; spermathecae in VIII ; no albumen 

 gland ; no vascular caeca. 



This genus is at present known by one species only, which has been studied 

 by myself (84). The chief points in its anatomy, besides those mentioned in the 

 above description, are the following : — The clitellum is developed upon segments 

 xiii-xvi. There are no special sperm-sacs, the two segments x, xi being filled 

 with developing spermatozoa ; the ova lie in a considerable number of segments 

 following that (the thirteenth) which contains the ovaries.)^ The spermathecae are 

 without diverticula of any kind, and have very thick muscular walls, consisting of 

 both circular and longitudinal fibres. The spermiducal glands are long, and have 



