64 EISEN 



consists of little more than the nephrostome. Lymphocytes narrow, 

 long, and rather irregular. Color white. 



Locality. — Orca, Prince William Sound, Alaska, June 25, 1S99, 

 Prof. Wm. E. Ritter. Only three immature or degenerating speci- 

 mens, so much twisted and curled that no successful sectioning could 

 be made. 



DETAILED DESCRIPTION. 



Few additional points can be given. The species seems well char- 

 acterized by its nephridia, the inner duct in which is narrower than in 

 any other species examined by me. 



Sexual pap ill c€. — The male pores sunk in the specimens ; no ex- 

 ternal penial papillae. The inner penial papillae constructed on the 

 same principle as in the other species described in this paper ; that 

 is, there is a set of glands grouped in bunches arranged like feathers, 

 between which opens independently the sperm-duct. The particular 

 arrangement could not be made out. 



Spermiducal apparatus. — The ducts seem to be short and rather 

 thick. 



Intestine is covered by a thick layer of closely set, but transparent 

 and non-staining chloragogen cells. 



Lymphocytes. — There is a cyanophil stroma in the meshes, in 

 which there are a few, or comparatively few, eosinophil granules. 

 The nucleus is small but distinct, staining pale blue. 



ENCHYTR^^US METLAKATLENSIS sp. nov. 

 pi. XVIII, fig. 5 ; p1. XIX, fig. I ; text-figs. 34-36. 

 Definition. — Length 1 2 mm., width .65 mm. Somites 60. Setae : 

 laterals 3 and 2 ; ventrals 3 and 4 in each fascicle. Prostomium 

 rounded, blunt. Clitellum XII and XIII. Sexual exterior papillge small 

 and not prominent. Septal glands in IV, V and VI. Brain oblong, 

 posteriorly slightly emarginatcd. Dorsal vessel rises in XV. Intes- 

 tine gradually emerging in the esophagus. Spermathecae with short 

 and thick duct and with a short apical sac opening into the intestine 

 by a pore ; a collar of glands at the base surrounds the exterior pore. 

 Sperm-ducts long and narrow, closely coiled, confined to XII. Sperm- 

 funnels short and thick, bent on themselves. Penial papillte two, be- 

 tween which open the sperm -ducts. Penial papillae consist of about 6 

 lobes in each papilla, the anterior and posterior papillae being of about 

 equal size. Ovaries in XII, testes in XL Testes each connected with 

 a sperm-sac which, penetrating the septum, projects into X, filling a 

 large part of the somite. The sperm-sacs are surrounded by a 

 coelomic membrane. Lymphocytes long and narrow, shuttle-like or 



