93 
(o warrant the establishment of a new genus for 1). f urcata. Bourne, 
however, had not apparently actually seen examples of this species 
and retrained from proposing a ncAv generic name. It would seem 
that these three species are really quite distinct from the remaining 
members of the genus and might well be separated generically. 
Bero roseola , n. sp. (PI. XIV., Figs. 1-5.) 
Segments, 1 5. Branchial area funnel-shaped, bearing a pair of 
mobile cylindrical palpi and three pairs of ciliated branchiae, cylin- 
diical pi shape and almost of equal length but slightly shorter than 
the palpi, the first pair of dorsal setae bundles occur in segment 
lf\e. The first ventral pair of setae bundles in segment two consist 
of but three seise apiece. Succeeding ventral bundles have each four 
setae, lhe worm is of a delicate pink colour, reaches a length of 
12 mm., and is rarely found inhabiting a tube, but may be found 
collected into dense clusters forming a distinct pink mass. 
Literature cited: — 
*91. 
VSG. 
*80. 
’07. 
'16. 
*06. 
Bourne, “Notes on Naidiform' Oligochmtfe,” 
Journ. Micr. Sc., 1891. 
vol. 32, Quart. 
Bousfield, “The Natural History of the Genus Dero,” vol. 
20, Journ. Linn. Soc. Zoology. Bond., 1890. 
Leidy, “ , American 
Naturalist, 1880. 
Michaelsen, “Oligochaeta,” Die Fauna Sildwest-Austra- 
liens, Bd. 1, Lief. 2. Jena, 1907. 
Pratt, “A manual of the Common Invertebrate Animals.” 
Chicago, 1916. 
A al ton, “Naidida> of Cedar Point,” Amer. Natur,. vol. 49, 
1906. 
Description of Plate: — 
Fig*. 1. A part of a cluster of living I). roseola, as seen under 
the binocular microscope, x 12. 
Fig. 2. An entire worm, killed and somewhat contracted, 
mounted in glycerine, x 25. 
Fig. 3. Anterior end of the same specimen, showing prostomium 
and eight segments more highly magnified, x 100. 
Fig. 4. Dorsal view of posterior end of another specimen, 
showing the branchiae almost entirely retracted 
within the anal funnel, x 100. 
Fig. 5. Ventral view of the posterior end of a third specimen, 
the retracted branchiae visible through the trans- 
parent ventral wall of the anal funnel, x 100. 
Figs 2-5 drawn with the aid of a Zeiss drawing camera. 
