250 OLIGOCHAETA 



The genus Limnodrilus as above defined contains a considerable number of species 

 from Europe and from N. America. I have received examples also from New Zealand 

 and from Hawai'. The following twelve species are perhaps recognizable : 



1. Limnodrilus hoffmeisteri, CLAP., Europe. 



2. udekemianus, CLAP., Europe. 



3. claparedianus, RATZEL, Europe. 



4. ornatus, EISEN, California. 



5. steigerwaldi, EISEN, California. 



6. monticola, EISEN, California. 



7. alpestris, EISEN, California. 



8. ,, silvani, EISEN, California. 



9. spiralis, EISEN, California. 



10. igneus, EISEN, California. 



11. corallinus, EISEN, California. 



12. californicus, EISEN, California. 

 A number of others are not recognizable. 



Tubifex elongatus, D'UDEKEM (Bull. Ac. Roy. Belg. t. xxii. and pt. p. 544) from the definition 

 ' Teguments transparents ; corps mince tres allonge ; des crochets fourchus dans tous les faisceaux. 

 Habile les eaux douces 'appears to be a LimiiodrHiis. It occurs in neighbourhood of Brussels and 

 is to be distinguished from Tubifex Hrulonim with which it lives by absence of capilliform setae. 



In spite of the impossibility of recognizing this species from the description, TAUBEK (1, p. 71) 

 records its occurrence in Denmark. LEVINSEN (2, p. 225) includes it under L. udekemianus, and 

 L. hoffmeisteri, following CLAPAREDE (2, p. 71, footnote 2), who considers it to be perhaps 

 synonymous with one or other of these species. This view is also held by VEJDOVSKY (24, p. 44). 



' Clitellio suchumicus,' CZERNIAVSKY, Bull. Mosc. 1880 (p. 328) is probably a Limnodrilus as it 

 has uncinate setae (3 in anterior bundles, 2 behind) and no others, and occurs in fresh water along 

 with Tubifex. It is not worth while to repeat the long Latin diagnosis given by CZERNIAVSKY, as 

 this contains no facts of importance save those mentioned. CZERNIAVSKY remarks that 'it is met 

 with in great numbers in shallow river of Suehum, under stones, particularly where it crossed a 

 road.' The few setae in each bundle may perhaps distinguish the species. 



' Clitellio heterosetosus,' CZERNIAVSKY (ibid. p. 328) is not defined in such a way as to render 

 its identification possible, though there seems to be no doubt about its being a Limnodrilus. In 

 possessing six or seven setae in each of anterior bundles it is a more normal Limnodrilus than 

 the last. 



'Nais gigantea,' KESSLER, Trud. Russk. Est. St. Petersb., 1868, is regarded by VEJDOVSKY as 

 a Limnodrilus. 



' Saenuris abyssicola,' SMITH and VERRILL, Am. Journ. Sci. Arts, 3rd ser. vol. ii. p. 449. This 

 worm is stated to consist of twenty-eight segments; 'anus terminal with three or four slight lobes' 2 ; 



1 These were collected by Mr. R. C. L. PERKINS ; I cannot differentiate them from the American 

 Camptodrilus. 



3 This is perhaps a little suggestive of the branchiae of Branchiura. I observed one specimen of this 

 worm in which there were only two or three close to the anus. 



