76 Records of the Indian Museum. [VoL. V, 
the present form, I will not definitely pronounce an opinion as to 
whether the range of variability in the genus is such, and the 
characters of the form now described are so distinctive, as to 
render the erection of another species desirable. The above 
account may however be of use as a contribution to the ‘‘ Dero- 
frage,’’ concerning which Michaelsen writes [6]: ‘‘ Trotz Bousfield 
halte ich eine Revision der Gattung Dero, zumal eine ausfiihrlichere, 
auch die Borstenverhaltnisse berticksichtigende Beschreibung der 
verschiedenen Formen oder Arten, noch ftir ein Desideratum.’’ 
As recommended by Michaelsen, I have paid particular atten- 
tion to the sete ; whether the peculiar relations shown by the post 
tion of the nodulus in the several component sete of a ventral 
bundle will also be found, when looked for, in other members of the 
genus, cannot be predicted ; it has not been noticed by the last- 
mentioned author in his recent detailed description of D. schmardat 
[7] and D. tnctsa [6], and it may not improbably be found to be of 
systematic value. 
LITERATURE. 
1. Beddard, F. E. .. A Monograph of the Order Oligo- 
cheta, Oxford, 1895. 
BoeeBourne: wen G: .. ‘*On Chetobranchus, a new genus 
of Oligochetous Chztopoda,”’ 
Quart. Journ. Mic. Sct. (N.S.), 
mao 
Bourne, A. G. .. ‘Notes on the Naidiform Oligo- 
cheta, ete.,’’ Quart. Journ. 
Macs Ser NES») xeaxdt= 
Aes eousield oi,.) 'C ». “The Natural” ‘distory “of ste 
genus Dero,’’ Journ. Linn. Soc. 
(Zool:)\ vol. xx "1687: 
Qo 
° 
5. Michaelsen, W. .. ‘‘Oligocheta,’’ Das Tierreich, Ber- 
Jin, 1900. 
6. Michaelsen, W. .. Hamburgische Elb-Untersuchung , iv, 
Oligocheten, Hamburg, 1903. 
7. Michaelsen, W. -. |. Zur Kenntnis. der, Naidident: 
(Separat-Abdruck aus Zoo/ogica), 
Stuttgart, 1905. 
8. Michaelsen, W. .. ‘Die Oligochaten Deutsch Ost- 
Afrikas, -Zett.j-wtss.. 7 00l..ande 
Ixxxil, 1905. (Aulophorus palus- 
tris, p. 308.) 
g. - Piguet, E. .. Observation sur les Natdidées. 
; Dissertation. Geneva, 1906. 
10. Stephenson, J. .. Description of two freshwater 
Oligochete Worms from the 
Punjab,” Records of the Indian 
Museum, vol.i, partiti, Calcutta, 
1907. 
