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, 1899, 

 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 papillae. The male pores sunk in the specimens ; no ex- 

 ternal penial papillae. The inner penial papillas 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 r or comparatively few, eosinophil granules. 

 The nucleus is small but distinct, staining pale blue. 



ENCHYTR^US METLAKATLENSIS sp. nov. 



pi. xvni, fig. 5 ; rl. xix, fig. i ; text-figs. 34-36. 



Definition. Length 12 mm., width .65 mm. Somites 60. Seta? : 

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

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

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

 posteriorly slightly emarginated. 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 papillae two, be- 

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

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

 equal size. Ovaries in XII, testes in XI. 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 

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



