. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. ENCHYTR^ID^ 43 35 (Xni) 5, 6, 5, 4, 5, 5, 6, 6, (5, 4, 3, 3, 2, 2) ; ventrals, 6, 7, 7, 7» 7^ h 05 (-^III) 4^ 7^ 6, 5, 4, 5, 6, 5, 4, 3, 2. Head-pore far for- ward. Clitellum XII-XIII. Copulative papilla insignificant. Septal glands in IV to VI. Brain broader than long, posteriorly truncate. Spermatheca short and broad, lopsided, with two short diverticles at the center. Sperm-ducts short, as long as the funnels. Funnels long and narrow. Penial atrium long and rather narrow. Three or four long atrial glands enter this a
. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. ENCHYTR^ID^ 43 35 (Xni) 5, 6, 5, 4, 5, 5, 6, 6, (5, 4, 3, 3, 2, 2) ; ventrals, 6, 7, 7, 7» 7^ h 05 (-^III) 4^ 7^ 6, 5, 4, 5, 6, 5, 4, 3, 2. Head-pore far for- ward. Clitellum XII-XIII. Copulative papilla insignificant. Septal glands in IV to VI. Brain broader than long, posteriorly truncate. Spermatheca short and broad, lopsided, with two short diverticles at the center. Sperm-ducts short, as long as the funnels. Funnels long and narrow. Penial atrium long and rather narrow. Three or four long atrial glands enter this atrium outside of the penial bulb. Some five or six penial glands inside of the bulb opening near the penial orifice. Ovaries and testes in XII and XI. Two large and very long sperm-sacs connecting with the funnels extend backward some fifteen or more somites. Nephridia rounded, with shallow lobes. Nuclei slightly oval. Lymphocytes unknown. Color of alcoholic specimens pale yellowish. Locality.— Port Clarence, Alaska. A single specimen, collected by Prof. Trevor Kincaid, August, 1897. Characteristics.—This species is readily distinguished by the short spermathecas, which are peculiarly lopsided, one diverticle being thicker than the other. The short sperm-ducts are also characteristic. Owing to want of specimens the detailed description given below is naturally meager. Part of the single specimen was dissected, part sectioned transversely. As will be seen, the species be- longs to the group of Mes- enchytraeids with atrial glands. These glands are larger than in ][f. fuscus. They are also less numerous than in that species, its nearest relative. DETAILED DESCRIPTION. Spermathecce (fig. 18, a and b^. — Both sperma- thecae showed a peculiar lopsidedness. Sperm-ducts (p1. ix, fig. 2). — These are less than one-eighth as long as the funnel. The penial bulb extends nearly to the end of the atrial en- largement in the dissected specimen. In the sectioned half it appears to
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