. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. 86 EISEN lobe being narrow, of rather even thickness, and at the apex capped by the usual sperm-sac. Ovaries multi-lobed, large, occupying all the available space in somite XII. Ventral glands (fig. 53, c). — The glands in the respective somites of nearly equal size; the most anterior one the smallest and the fourth in order the largest. The individual glands smaller than in L. fran- clscanus and in L. santceclarce. Setcc.^ThQ number of setas in the fascicles seems to be variable. Of the two counts given the higher number is
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. 86 EISEN lobe being narrow, of rather even thickness, and at the apex capped by the usual sperm-sac. Ovaries multi-lobed, large, occupying all the available space in somite XII. Ventral glands (fig. 53, c). — The glands in the respective somites of nearly equal size; the most anterior one the smallest and the fourth in order the largest. The individual glands smaller than in L. fran- clscanus and in L. santceclarce. Setcc.^ThQ number of setas in the fascicles seems to be variable. Of the two counts given the higher number is the most common. LUMBRICILLUS FRANCISCANUS sp. nov. pi. XIII, figs. I and 2 ; text-figs. 55-57. Definition. — Length 10 to 12 mm., width .75 mm. Somites 39 to 58. Setae : ventrals, 6, 5, 4, 3 ; laterals, 4, 3, 3, 3. The lateral interval about double the width of the ventral interval. The setae in each bundle of nearly equal size. Head-pore large, between prosto- mium and somite I. Prostomium round, blunt. Clitellum XII and XIII. Copulative papilla small. Septal glands in IV to VI. Brain strongly emarginated posteriorly, about thirty units long by fifteen wide at center. Dorsal vessel rises in XIV or XV. Intestine with a thin layer of chloragogen cells. Spermatheca with an oval ampulla and a thin straight duct, the latter surrounded along its whole length by a conical shaped agglomeration of glands. Sperm-ducts thin and long. Sperm-funnels about twice as long as thick. Ventral glands in somites XIV, XV and XVI, in- creasing in size posteriorly. Ovaries in XII, testes in XI. The testes lobes are short, rounded, pear-shaped. Nephridia are longer than broad. Lymphocytes oval, varying considerably as regards size. Locality. — Santa Clara River, California, in the moist soil of the banks. Characteristics. — The species is distinguished principally by the form of the spermatheca and the glands at the base. In P. sanice-. FiG. 55. Lumhricillus Please note that th
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