76 ZOOLOGISCHE MEDEDEELINGEN — DEEL VI. 



a* antennae and cirri elongated. 



robusta Ehl. Deutsche Tiefsee Exped., 1898—99, Vol. XYI, 

 1912, p. 59, PI. VI, figs. 4 — 7.Augener, Meeresfauna West- 

 Afrika's, Polychaeten, p. 229. Fisch-bucht (S. Atlantic), 

 Senegal. 

 b* antennae and cirri very short. 



incerta Webst. Trans. Albany Institute, Vol. IX, 1879, 

 p. 67, PI. XI, figs. 155—157. Coast of Virginia. 



Genus Castalia Savigny. 



(Psamathe Qtrf,). 



(Kefersteinia Qtrf.). 



Cephalic lobe roundish quadrangular, with four eyes. 2 Antennae on 

 the frontal border of the head and two palps present. Tentacular cirri 

 two, three or four pairs l ) on each side, filiform and long. Proboscis with 

 papillae on the margin and two ventral elevated ridges. Parapodia 

 distinctly or slightly biramous. 



A. 4 pairs of tentacular cirri. 



aurantiaca Sars, loc. cit. p. 20. Norway (Floröen). 

 longicornis Sars, loc. cit. p. 21. Norway (Manger). 

 hesionoides Aug. West-Indischen Polychaeten: Bull. Museum Compar. 



Zoology, Cambridge, Vol. 43, 1908, p. 155, PL VI, figs. 106—109. 



Barbados. 



B. 3 pairs of tentacular cirri. 



punctata (O. F. Müll.) Mc Intosh, the British Annelids Vol. 2, Pt. I, 



pag. 120, Pits. 46, 69 and 79. North Sea (Scotland, Norway), 



Atlantic (Greenland, Azores). 

 mutilata Treadw. Treadwell, the Polychaetous Annelids of Porto Rico : 



Bull. U. St. Fish Commission, Vol. XX, 1902, p. 185, text-fig. 4. 



San Juan. 

 ? limicola (Will.) Pearl Oyster report, Pt. IV, 1905, p. 267, PL III, 



figs. 74—76. 

 ? longicirrata Treadw. loc. cit. p. J 85, text-figs. 2 and 3. Porto Eico. 

 agilis Webst. a, Be n ed. 2 ) The Annelida chaetopoda from Provincetown 



1) Sars, who first gave a diagnosis of this genus (Videnskabsselsk. forhandl. for 1861), 

 says therein „cirri tentaculares utrinque sex aut octo, longissimi" ; however he overlooked that 

 the nearly allied species Cast, arctica anà-fusca are provided only with two pairs of tentacular 

 cirri on each side. 



2) This species cannot be ranged among the genus Hesione, as done by Webster and 

 Benedict, because of the presence of only 8 pairs of tentacular cirri on each side and by their 

 feet being distinctly biramous. No doubt it belongs to the genus Castalia, as already alluded 

 to by the American authors themselves at the end of their paper. 





