. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ENCHYTR^ID^ 77 LUMBRICILLUS SANT^CLAR^ sp. nov. pi. XIII, figs. 3 and 4; text-figs. 44-46. Definition. — Length 8 to 13 mm., width .5 mm. Somites about 50. Setag slightly sigmoid, averaging one more in the ventral than in the lateral fascicles. Ventrals 6, 8, 7, 6, 5, 4, 3 ; laterals 6, 7, 6, 6, 4, 3, 3. Head-pore large, between prostomium and somite I. Head blunt and rounded. Clitellum not prominent, XII and XIII. Copu- lative papillae small. Septal glands thick and compact, septal part about equal to interseptal part. Brain
. Alaska. Natural history -- Alaska; Scientific expeditions; Alaska. ENCHYTR^ID^ 77 LUMBRICILLUS SANT^CLAR^ sp. nov. pi. XIII, figs. 3 and 4; text-figs. 44-46. Definition. — Length 8 to 13 mm., width .5 mm. Somites about 50. Setag slightly sigmoid, averaging one more in the ventral than in the lateral fascicles. Ventrals 6, 8, 7, 6, 5, 4, 3 ; laterals 6, 7, 6, 6, 4, 3, 3. Head-pore large, between prostomium and somite I. Head blunt and rounded. Clitellum not prominent, XII and XIII. Copu- lative papillae small. Septal glands thick and compact, septal part about equal to interseptal part. Brain about 30 units long and 12 units broad (at center), and strongly emarginated posteriorly. Dor- sal vessel rises in XIV. Intestine gradual- ly widening. SpermathecjE with a thick duct distinct from the ampulla. A thin ring of glands at the base of the duct. Sperm-ducts thin, confined to somite XII. Sperm-funnels slightly more than three times as long as wide, curved. Penial bulb round, small. Testes multi-lobed. Ovisac not extending posterior to clitellum. Ventral glands in XIV and XV. Nephridia thick, with a min- ute antescptal and a thick postseptal from the posterior end of which the thick duct projects. Locality. — Banks of Santa Clara Creek, San IMateo County, Cali- fornia. Characteristics. — The prominent feature in this species is the shape of the spermatheca and the very thin disc of glands at its base. DETAILED DESCRIPTION. Three specimens were dissected and three sectioned, one of them transversely. As none of the specimens had been properly fixed, no attempt is made to describe the finer structure. Length. — The specimens at my disposal varied somewhat as re- gards length, some being not over 8 mm., while others were 12 mm. The somites varied between 45 and <^^., the most mature specimens being the largest. Setcs vary to the extent that in some specimens the anterior ventral bundles possess one more seta than in other specimens. Thus I have once counted as
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