24 



EISEN 



Nephridia (fig. 3, h) . — A larger and especially a broader nephro- 

 stome than any other species examined by me. Nephridia of the 

 somites anterior to clitellum much larger than those in the posterior 

 somites. But the ducts leading to the pores of these anterior nephridia 

 are much shorter than the ducts of the posterior nephridia. In the 

 latter the duct is twice or three times as long as in the anterior ones. 



MESENCHYTR^US HARRIMANI sp. nov. 



pi. I, figs. :-6; pi. II, figs. 1-7; and text-figs. 4-6. 

 Definition. — Length 60 mm. or more; width 2.5 mm. or over. 

 Somites about 100, deeply set. The few anterior somites strongly 

 pigmented on dorsal side ; the somites following less and less pig- 

 mented, the j^osterior ones 

 not at all. Setas strongly 

 curved; laterals, 3, 3, 2, 3, 

 3' 3' 3^ 3^ 3^ 2 (XI), o 

 (XII), 3, 4, 3, 3, 4» 3' 3; 

 ventrals, 5, 5, 5, 6, 5, 6, 6, 



6, 6, 5 (XI), o (XII), 6, 



7, 6, 6, 7, 7, 6, etc. Cli- 

 tellum XI, XII, and \ XIII. 

 Sexual papillte not project- 

 ing. Septal glands in IV 

 to VI. Brain square, an- 

 teriorly strongly emargi- 

 natcd, posteriorly almost 

 straight and slightly emar- 

 ginated, Spermathecse un- 

 usually elongated, with two 

 strong diverticles near the 

 base ; the apical ampulla 

 several times longer than 

 the basal pait, extending to 

 somite X or XI. Sperm- 

 duct about three times as 

 long as the atrium and 

 bulb, and about three times 

 as long as the funnel. 

 Fvmnel long, narrow, and 



cylindrical, extending forward through three somites; about six 

 times as wide as the sperm-duct. Bulb large, globular. Atrium 



Fig. 4. Mesenchytrccus harrimani. 



