ENCHYTR^ID^ 



SI 



Locality. — Hoods Peak, Sonoma Co., California, April, 1S93, in 

 soil near a creek. Collected by Miss Alice Eastwood. Of some 

 twenty specimens only a few are adult. 



Fig. 25. MesencJiytrceus east-woodi. 



In size this species resembles Af. fontinalis. From this species 

 M. eastwoodi is well distinguished by its atrial glands, its small lym- 

 phocytes, and the arrangement of its setae, which gradually diminish 

 in size toward the lateral interval. 



MESENCHYTR^US NANUS sp. nov. 

 Text-fig. 26. 

 Definition. — Length 8 mm., width .6 mm. Somites 56, well de- 

 fined. Setae : laterals, uniformly 2, 2, etc., i ; ventrals, 3, 4, 4, 5, 

 5, 5, 5, 4, 4, 4, o, 2, 3, 2, etc. Head-pore near apex. Sexual 

 papillae distinct. Septal glands IV to VII. Brain almost square, 

 posteriorly deeply emarginated. Dorsal vessel rises in XVI. Intes- 

 tine covered with thick chloragogen cells. Spermathecse large, con- 

 fined to one somite, with a large central chamber representing two 

 primitive, opposite, diverticles ; apex of spermathecal ampulla appears 

 to be connected with the intestine by a pore. No sperm-ducts; the 

 sperm-funnels (fig. 26, d^ club-shaped, open directly in the penial pore 

 without any intermediary ducts. There is no penial bulb, and no 

 glands of any kind in connection with the efferent apparatus. Testes 

 and ovaries normal. A single ovisac and two sperm-sacs extending 

 backward through several somites. Nephridia with very long duct 

 and many-lobed central part. Lymphocytes small, ovoid, not fringed. 



