178 ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



XIII. - ON THE SUPPOSED IDENTITY OF BATHYNOË NODULOSUS 

 DITL. AND WEBERIA PUSTULATA HORST. 

 BY Dr. R. HORST. 



In December 1915 I published a preliminary account of a rare Polynoid- 

 worm, Weberia pustulata, dredged by the Siboga Expedition in a consider- 

 able depth in the Malayan Archipelago, at the stations 45 and 314, north off 

 Soembawa 1 ). The species is especially characterized by the total absence 

 of the eyes as well as of the ventral cirri, except in the first setigerous 

 segment ; moreover it lacks the notopodial fascicle, whereas the neuro- 

 podial one is represented by four hook-shaped setae. Some time ago Hjal- 

 mar Ditlevsen kindly forwarded to me the 1 st part of his account of the 

 Annelids of the Danish Ingolf-Expedition 2 ). In this paper I met with the 

 description of a Polynoid-worm, Bafhynoê nodidosus, dredged at great depth 

 in the Atlantic Ocean (south off Iceland), that in its essential characters 

 so much agrees with Weberia pustulata, that I concluded the two species 

 to be identical. Unfortunately the Malayan worms had lost the dorsal 

 cirri as well as the elytra, some of which however were preserved in 

 the Atlantic specimen. Having informed Mr. Ditlevsen of my supposition, 

 he answered me, that he also was much inclined to consider the two 

 forms as specifically identical. No doubt it is an interesting contribution 

 to our knowledge of the wide geographical distribution of abyssal forms. 



1) Zoolog. Mededeelingen 's Rijks Museum v. Natuurl. Historie te Leiden, Dl. T. p. 246. A 

 more detailed description was given in the: Polychaeta errantia of the Siboga Expedition, Part 

 II, Aphroditidae and Chrysopetalidae, 1917, with 19 Pis. 



2) The Danish Ingolf-Expedition, Vol. IV, 4, 1917, with 6 Pis. 



