134 Memoirs of the Indian Museum. ' [Vol. I, 



The dorsal bundles contain i — 4 hair-like setae, mostly 2 or 3, often only i, very 

 rarely 4. The setae are somewhat longer than the diameter of the body, slightly curved 

 and provided with a series of very fine hair-like appendices or spinelets. Besides these 

 hair-like setae there are generally as many needle-like setae with a fine, simple, hair-like 

 distal end projecting not much above the surface of the body. Generally such a needle- 

 like seta is joined to a hair-like one, but often there is found a hair-like seta without a 

 needle-like one, or vice versa. In one bundle I found only i hair-like seta joined to 

 4 needle-like ones. Formerly I supposed these needle-like setae to be younger and un- 

 developed hair-like setae, but now I accept the view of PIGUBT,^ who regards them 

 as quite a different sort of setae. I may remark here, that in the var. paraguayensis, 

 MICHIvSN., of P. prohoscidea these needle-like setae are not at all as distinct as in the 

 form typica. Only in one bundle of ventral setae of one of the type-specimens of this 

 variety could I detect such a needle-like seta with fine and simple hair-like distal end. 

 I am even not quite sure whether this was really a true '^needle-like" seta. Perhaps 

 we are dealing in this apparently unique case with an undeveloped "hair-like" seta. 

 As the examination of spirit-material is by no means apt to give good results, we had 

 better leave the question open as to the existence of needle-like setae in P. prohoscidea , 

 var. paraguayensis. 



VAR. PARAGUAYENSIS, MiCHIvSN. 



P. prohoscidea, BEDD., var. p., MICHABLSEN, in Zoologica, 44, p. 360. 



P. cequiseta, BOURNE, var. p., MICHAEI/SEN, in Zeitschr. wiss. Zool., Ixxxii, p. 309. 



Hab, — Bengal, Calcutta, washed from colonies of Plumatella fruticosa and 

 P. emarginata , in a tank of the Zoological Garden ; Dr. N. ANNAN- 

 DAlvB leg., 5-1-07. 



Remarks. — The specimens examined possessed the character of the variety 

 in a rather more distinct manner than those examined by me previously. The hair- 

 like dorsal setae were partly nearly four times as long as the body was thick and 

 the serration was very distinct. 



Pristina tentacui^ata (Piguet). 



? Pristina equiseta, BOURNE, in Quart. Journ. micr. Sei., N. Ser., vol. xxsii, p. 352. 



Naidium tentaculatum, PIGUET, in Rev. suisse Zool., t. xiv, 1906, p. 219 ; pi. 9, figs. 18—20, 26. 



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



Present one specimen. 



Remarks. — I have been able to examine not only this Indian specimen, but' 

 also some spirit specimens from the vicinity of Hamburg which undoubtedly belong to 

 this species. I note only the agreement in the shape and relations of the ventral setae 

 of the fourth segment. I may remark that in one of the North German specimens I 

 found such giant setae not only on the fourth, but also on the fifth segment, whilst 



' E. PIGUET, Observations .sur les Naididées, etc.; in Rev. suisse Zool., t. xiv, p. 291 (P. longisela, 

 Ehrbg.). 



