DESCRIPTIONS OF GENERA AND SPECIES 253 



(4) Limnodrilus ornatus, Eisen. 



L. ornatTiSj EiSEN, Bih. K. Svensk. Akad., No. 16, 1879, p. 17. 

 Clltellio (Limnodrilus) ornatus, Vaillant, Annel^s, p. 436. 



Definition. Length about 30 mm. Brain with shallow concavity posteriorly. Spermathecae 

 pear-shaped, sometimes constricted in middle. Penis about five times as long as broad. 

 Nephridia without large globular peritoneal cells. Hah. — California ; San Joaquim river. 



The ' principal characteristic ' of this species is, according to Eisen, ' the star-like 

 concretions round the upper end of the penis sheath.' His figure (12, PI. ix, 8 d cm) 

 shows that these bodies are attached to the upper extremity of the penis just where 

 it becomes continuous with the penis sheath (' Penisscheide,' Vejdovsky, not ' penis 

 sheath,' Eisen). I do not understand what these structures are. Vejdovsky only 

 doubtfully allows this species to be a Zimnodrilus. 



(5) Limnodrilus steigerwaldi, Eisen. 



L. steigerwaldi; Eisen, loc. cit., p. 18. 



Clitellio (Limnodrilus) steigerwaldi, Vaillant, loc. cit., p. 437. 



Definition, Length about 80 mm^. Brain with marked concavity posteriorly, wider in front 

 than behind, and prolonged into lobes anteriorly. Spermathecae narrow and pear-shaped ; 

 penis about as long as in last species. Nephridia without globular peritoneal cells, except 

 just behind funnel. Hah. — California; Sierra Nevada. '], 000 ft. 



This species is to be distinguished from the last by its greater size and more 

 complex brain. Vejdovsky again only doubtfully includes it in the genus 

 Liitnnodrilus. 



(6) Limnodrilus monticola, Eisen. 



L. monticola, Eisen, loc. cit., p. 18. 



Clitellio (Limnodrilus) monticola, Vaillant, loc. cit., p. 437. 



Definition. Length about 30 mm. Brain much as in L. ornatus, but squarer. Spermathecae 

 cylindrical, sometimes with slight constriction. Penis about eight tim.es as long as broad, 

 truncated at extremity. Hab. — California; Sierra Nevada. 9,000/!. 



The truncated extremity of the chitinous sheath of the penis is, according to Eisen, 

 the most characteristic mark of this species. It should be noted, however, that 

 Diepfenbach (PI. ii, fig. i) figures a similar truncation in L. hoffmeisteri. 



' stated by Eisen in (12, p. 89s) to be 30 m. by an evident misprint. 



