DESCRIPTIONS OF GENERA AND SPECIES 251 



there are five or six setae in each fascicle ' simple acute, slightly curved ' ; in one specimen there 

 were four minute ocelli. 



This species, which is obviously insufficiently described, is included by VE.TDOVSKY among the 

 Tubificidae, and is doubtfully regarded by VAILLANT (6, p. 433) as a Limnodrilus. It is not stated, 

 however, that the setae are uncinate, and therefore MICHAELSEN may possibly be right (6, p. 50) 

 in placing it among the Enchytraeidae ; he remarks with regard to this and the following species 

 'diese beiden Verril'schen Arten miissen den Enchytraeiden zugeordnet werden, da sie einfach 

 zugespitzte Borsten haben.' 



' Saenuris limicola,' SMITH and VERRILL, Am. Journ. Sci. Arts, 3rd ser. vol. ii. p. 450, consists of 

 forty-four segments; 6-8 setae in each fascicle anteriorly, 4-5 posteriorly; setae 'long, slender, 

 curved, and acute.' 



This species, again referred to the Tubificidae by VEJDOVSKY, and to Limnodrilus doubtfully by 

 VAILLANT (6, p. 434), is put by MICHAELSEN among the Enchytraeidae. In favour of this placing 

 of the species and the last, in addition to the form of the setae emphasized by MICHAELSEN, is 

 the fewness of the segments of which the body is composed. 



'Saenuris vagans,' JOHNSTON, Cat. Worms, B. M., pp. 65, 353. This species is doubtfully included 

 by VEJDOVSKY (24, p. 46) as a synonym of Tubifex rivulontm. VAILLANT, as I think, with more 

 probability regards it as possibly a Limnodrilus. So far as the definitions given by JOHNSTON, and 

 in the appendix to the 'Catalogue of non-parasitical worms' by BAIRD go, and this is naturally 

 not very far, this is the only conclusion that could be safely arrived at. The setae are, however, 

 described as 'acute at the outer extremity,' and there is no mention of a bifid tip. It is probably 

 this which has led MICHAELSEN to include the species 1 (5, p. 53) among the Enchytiaeidae, as 

 well as its small size (6'"), and the fewness of the segments (50) of which the body is composed. 



Tubifex uncinarius of DUOES possibly belongs here, and T. deserticola and Limnodrilus bogdunovii 

 of GRIMM. 



In conclusion, I may briefly refer to the existence of this genus in Hawai, where 

 it is represented by a species which shows the remarkable spiral disposition of the 

 muscular fibres round the spermiducal gland. The specimens were obtained from 

 a spring on a mountain, but I cannot distinguish any marked peculiarities which 

 justify me in giving it a new name, though on the other hand I have not yet 

 identified it with any of the known forms. Living material is essential for the 

 proper description of these Tubificids. 



(i) Limnodrilus claparedianus, RATZEL. 



L. claparedianus, RATZEL, Z. Wiss. Zool. 1868, p. 590. 



Camptodrilus spiralis, EISEN, Bih. K. Svensk. Akad., 1879, No. 16, p. 22. 



Camptodrilus californicus, EISEN, loc. cit., p. 24. 



Tubifex rivulorum, BUDGE, Arch. f. Nat. 1850, p. i (in part.). 



Clitellio (Limnodrilus) claparedianus, VAILLANT, Annele*s, p. 424. 



1 But no mention is made of the cleft extremity of the setae of T. rivulontm by JOHNSTON ; the neglect, 

 therefore, to mention this fact with reference to the setae of 'Saenuris vagans' is not an argument that 

 the setae indicate the Encliytraeid family. 



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