254 OLIGOCHAETA 



(7) Limnodrilus alpestris, Eisen. 



L. alpestriSj EtSEN, loc. cit., p. 19. 



Clitellio (Limnodrilus) alpestris, Vaillant, loc. cit., p. 428. 



Definition Length about 25 mm. Brain wider behind, sometimes trilobed. Nephridia with 

 vesicular cells. Sjjermathecae wider at both extremities than in the middle, coiled at the 

 upper- extremity. Chitinous penis sheath about eight times as long as broad, trumpet 

 shaped at extremity. Hab.- — California; Sierra Nevada. '], 000 ft. 



The shape of the brain and of the extremity of the chitinous penis are stated by 

 Eisen to be the distinguishing marks of the species. 



(8) Limnodrilus corallinus, Eisen. 



Camptodrilus corallinus, Eisen, loc. cit., p. 23. 



Clitellio (Limnodrilus) corallinus, Vaillant, loc. cit., p. 431. 



Definition. Length 25-70 mm. Brain nearly square, with square cleft behind ; anterolateral 

 processes well developed. Nephridia in front of clitellum with, behind clitellum without, 

 vesicular cells. Spermathecae wide and globular without narrow duct. Chitinous penis 

 sheath eight times as long as broad. Hab. — California; Fresno county. 



The presence of vesicular cells surrounding the nephridia in the anterior segments, 



but not of the posterior segments, is a character which this species shares with 



L. hoffmeisteri ; the form of the brain in the two species is evidently not unlike, 



• though that of L. hoffmeisteri (Vejdovsky, 24, Taf. viii, fig. 14) want the deep and 



square posterior cleft. 



(9) Limnodrilus silvani, Eisen. 



L. silvani, Eisen, loc. cit., p. 19. 



Clitellio (Limnodrilus) silvani, Vaillant, loc. cit., p. 428. 



Definition. Length 180 mm. Brain wider than long, and wider behind than in front, some- 

 times furnished with three posterior lobes. Nephridia without vesicular peritoneal cells. 

 Spermathecae wider at extremities. Chitinous penis, only three or four times as long 

 as broad. Hab, — San Francisco. 

 This species is described by Eisen as occurring in two varieties ; one is very much 

 longer than the other. In the above definition the longer form only defined ; the 

 smaller worms (50 mm. in length) occur with the bigger ; their brain is longer than 

 wide and never trilobed ; the spermatheca is straight. As intermediate forms are found 

 (though rarely) Eisen unites them into one species. 



