36 THE SHORTER SCIENTIFIC PAPERS 



DERO VAGA (Leidy) 



Aulophorus vagus Leidy, Amer. Nat., vol. 14, p. 423, figs. 3, 4, 18 80; Reighard, 

 ?roc. Amer. Acad., vol. 20, p. 88, pi. 1, figs. 1-10; pi. 2, figs. 11-20; pi. 3, figs. 

 21-31, 1885. 



Dero vaga L. Vaillant, Hht. Nat. Annel., vol. 3, p. 383, 1890; Stieren, Sitzb. 

 Ges. DoTpat, vol. 10, p. 107, 1893. 



D. furcafa Bousfield (part), Journ. Linn. Soc. London, vol. 20, p. 105, 1887. 



D. vaga Michaelsen, Das Tierreich, Oligochoeta, p. 29, 1900. 



Prostomium rounded. Ventral bundle of segments 2 

 to 5 with 8 to 14 long slightly curved, biuncinate setae, 

 with upper somewhat longer than the lower tooth. Ven- 

 tral bundles of remaining segments with 4 to 7 shorter, 

 more curved, biuncinate setae; with the upper shorter than 

 the lower tooth. Dorsal bundle of setse beginning on 6th 

 segment; composed of 1 to 3 capilliform and 1 to 3 

 palmate setas. 



Posterior end with rudimentary branchia and two long 

 finger-like processes. Three pairs of hearts in segments 

 8, 9, and 10. Brain wider than long. Length 8 mm. or 

 more; number of segments in an individual 24 to 3 5. 



In slime of ditches, etc., among fresh-water plants. 

 Massachusetts (Cambridge), Pennsylvania (Philadelphia), 

 Illinois, Ohio (Cedar Point), and Trinidad, West Indies. 



This species was extremely common at Cedar Point, 

 particularly among cultures containing Riccia fliiitans, 

 the thallus of which together with statoblasts of Bryozoa, 

 etc., it uses in the building of a protective tube by means 

 of a viscid secretion from the body. When walking 

 around with its tube it bears a striking resemblance to a 

 minute caddis-fly larva. 



Genus Stylaria Lamarck, 1816 



Prostomium developed into a tentacular process. Ven- 

 tral bundles composed of biuncinate setas; dorsal bundle 

 composed of capilliform setae, beginning on 6th segment. 

 Testes in 5 th, ovaries in 6th, spermathecse in 5 th segment. 



Fresh water. Europe, North America; one species. 



STYLARIA LACUSTRIS (Linne) 



Nereis lacustris Linne, Syst. Nat., ed. 10, p. 654, 1758; ed. 12, vol. 2, p. 1085, 

 1767. 



Stylaria lacustris Johnston, Cat. Brit. Non-paras. Worms, p. 70, 1865; Vejdovsky, 

 Syst. Morphol. OUg., p. 30, pi. 3, fig. 27; pi. 4, figs. 1-24, 26-31, 1884. 



