igoS.] W. Michaelsen: Oligochœta of the Indian Empire and Ceylon. 135 



there were no ventral setae at all on the fourth segment of another specimen. I believe 

 it very probable that BOURNE'S Pristina equiseta (corr. P. œquiseta) is identical with 

 this species. As BOURNE said that he found giant setae only in a part of his speci- 

 mens, I formerly did not lay any stress upon the fact that the specimens now 

 called P. proboscidea by me were bare of these setae, and united them to P. œquiseta. 

 I regarded those giant setae of P. œquiseta as sexual setae, developed during a certain 

 short period. But now my opinion is altered. Perhaps BOURNE had in hand 

 both species, P. proboscidea and P. tentaculata, which may occur in company, as the 

 Indian material shows. It is in any case of no importance that BOURNE did 

 not see the forked " needle-like " setae of P. tentaculata, for the teeth of the fork are 

 so very fine that they may easily be overlooked and the forked seta be regarded as 

 an undeveloped hair-like seta. 



Pristina longiseta, Ehrbg. 



F. TYPICA. 



p. leidyi, SMITH (part), MICHABLSEN, in Zoologica, 44, p. 357. 



P. longiseta, EHRBG. [f. typical, MICHAELSEN, in Zeitschr. wiss. Zool., Ixxxii, p. 309. 



Hab, — Bengal, Calcutta, in Spongilla crassissima ; Dr. N. ANNANDAI^E leg. 

 ,, . ,, washed from colonies of Plumatella ' rep ens and 



P. emarginata in a tank of the Zoological Garden ; 



Dr. N. ANNANDAlvE leg., s-i-o;. 



Remarks. — The serration of the dorsal setae is in the examined specimens 

 very faint, hardly recognisable, even more indistinct than in the specimens from 

 German East Africa. There is, therefore, no doubt about the identity of these Indian 

 specimens with the species of EHRENBERG, who did not see the serration. We 

 nq,w have all grades from the typical form of EHRENBERG, without any serration or 

 without distinct serration, to the var. leidyi (SMITH) with roughly serrated dorsal 

 setae. " . • 



FAM. TUBIFICID^. 

 GEN. BOTHRIONEURUM. 



BOTHRIONEURUM IRIS, BEDD. • 



ßothrioneuron i., BEDDARD, in Proc. Zool. Soc. London, 1901, i, p. 81. 



I examined one fully mature complete specimen and some incomplete or young 

 ones. 



External Characters, — In the situation of the clitellum and the male pore 

 the mature specimen is in accord with most of the Tubificids (the clitellum occupies 

 the eleventh and twelfth segments, the male pore is found on the eleventh segment), 

 whilst in the type specimens from the Malayan Peninsula all the generative organs 

 are dislocated backwards for one segment. I think this dislocation an abnormity 

 without systematic importance. 



