. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. 34 EISEN glands similar to those found in ^ but more numerous. The lower part of the penis contains a few long glands enclosed within the penial sheath. The sperm-sacs seem unusually large and extend beyond somite XVIII. The lymphocytes were poorly preserved and their exact shape could not be made out, but they appeared oval and very small. Nephridia (fig. I3«).— More deeply lobed than in any other spe- cies, the ducts unusually large, even for a Mesenchytrceus. The. jQore^ Fig. 13. Mesenchytrceus obscurus. nucl
. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. 34 EISEN glands similar to those found in ^ but more numerous. The lower part of the penis contains a few long glands enclosed within the penial sheath. The sperm-sacs seem unusually large and extend beyond somite XVIII. The lymphocytes were poorly preserved and their exact shape could not be made out, but they appeared oval and very small. Nephridia (fig. I3«).— More deeply lobed than in any other spe- cies, the ducts unusually large, even for a Mesenchytrceus. The. jQore^ Fig. 13. Mesenchytrceus obscurus. nuclei all round. The inner lumen irregular and wide with a large number of wide chambers. The windings shown in the figure are only approximately correct. Not all the nuclei are figured, as many would not stain. MESENCHYTR^US MACULATUS sp. nov. p1. v, figs. 1-5; and text-fig. 14. Definition.—Length 45 to 60 mm., width mm. Somites 93. Head-pore far forward. Setas : laterals, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3 ; ventrals, 6, 8, 8, 8, 8, 8, 7, 6, 7, 7, o, 6, 6, 6, 6, 6, etc., diminishing in size towards lateral interval. Clitellum IX, XII and XIII. Sexual papillae small, white. Brain deltoid, posteriorly slightly emarginated. Dorsal vessel rises posterior to clitellum. In- testine with a thick layer of brown chloragogen cells. Spermathecae unusually enlarged, with two tubular diverticles at the center of the duct; the ampulla at first wide, doubled on itself, then narrower, ex-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eisen, Gustavus A. , 1847-1940; Washington Academy of Sciences (Washington, D. C. ); Harriman Alaska Expedition (1899). New York : Doubleday, Page
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