. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. 30 EISEN Characteristics. — One of the best defined species. Not only is it strongly characterized by its enormous spermathecae, but also by the large accessory gland-complex opening through the penial bulb onto an external penis, independent of the sperm-ducts. The blood is deep orange. This is also the color of the blood of M. foittinalis and M. grandis^i these three species being the only ones of this genus which I have examined alive. DETAILED DESCRIPTION. Spermat/iecce (fig. ii^). — The large sac-like part of the a
. Enchytræidæ of the west coast of North America. Enchytraeidae; Annelida. 30 EISEN Characteristics. — One of the best defined species. Not only is it strongly characterized by its enormous spermathecae, but also by the large accessory gland-complex opening through the penial bulb onto an external penis, independent of the sperm-ducts. The blood is deep orange. This is also the color of the blood of M. foittinalis and M. grandis^i these three species being the only ones of this genus which I have examined alive. DETAILED DESCRIPTION. Spermat/iecce (fig. ii^). — The large sac-like part of the ampulla, which extends through many somites, is bent at a right angle against the lower part, which carries the diverticles. For the sake of clear-. FiG. lo. MesenckytrcEus frattciscanus. ness this is not shown on the figure. In four specimens sectioned and in two dissected the spermathecae agreed as regards form. In length they varied, some ending into XI, others in XII. Spermiducal apparatus (p1. iv, fig. 4, and test-fig. 10 «). — Fun- nels large, extending either backward or forward through two somites, nearly straight, and about 12 times as wide as sperm-duct. Sperm- duct not much more than \\ times as long as the funnel; much twisted and difficult to measure. Atrium has the usual form. The part inside the bulb about equal in thickness to the part outside the bulb. In the latter open some eight or more small globular atrial glands. These do not penetrate the penial bulb, but open in a circle all around. 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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