EUNICIDAE 121 



Eunice longicirrata, Webster. 



Treadwell, 1921, p. 11, pi. i, figs. 1-4, text-figs. 3-12. 

 Eunice artiadata, Ehlers, 1887, p. 83, pi. xxiv, figs. 8-10. 

 Eunice antillensis, Ehlers, 1887, p. 84, pi. xxiv, figs. 5-7. 

 Augener, 1918, p. 314. 



St. 283. 14. viii. 27. Off Annobon, Gulf of Guinea. -75 to i mile N 12° E of Pyramid Rock, 

 Annobon. 18-30 m. Gear DLH. Fifteen specimens. 



Remarks. The largest complete specimen measures 160 mm. by 3 mm. including 

 the feet. 



The body is extremely slender and not thickened in the anterior region as is usual 

 in the genus. The colour is a pale gold: the 4th chaetiger is colourless and the seg- 

 mental grooves are marked with a thin colourless band which widens slightly from before 

 backwards. Towards the middle of the body this colourless band widens out into a 

 triangular spot in the mid-dorsal line. The colour of the ventral surface is lighter than 

 that of the dorsal. The tentacles, tentacular cirri and dorsal cirri of about the first seven 

 segments are strongly moniliform with a brown colour band at each constriction. 

 Further back the segmentation of the dorsal cirri is not so clear and the banding appears 

 less regular. 



The prostomium is deeply incised in front : the median tentacle reaches to the 4th 

 chaetiger and the two lateral pairs are shorter. The tentacular cirri are unusually long, 

 reaching to the end of the prostomium. 



The ist segment is equal in length to the first two chaetigers, and the 2nd segment 

 is about half the length of the ist chaetiger. 



The gills begin as a single filament at the 3rd chaetiger and are continued for 80-100 

 chaetigers. There are usually about 40 post-branchial segments, but in one posterior 

 fragment I counted as many as 80. The maximum number of filaments in these speci- 

 mens is four. At about the 15th chaetiger reduction in the number of filaments begins, 

 and at the 35th chaetiger a single filament remains; this persists to the end of the gill- 

 bearing region. The gills are never more than half the length of the dorsal cirri. 



The ventral cirrus is a stout subulate structure till the 5th foot, where it becomes 

 mammiform: at about the 30th foot it lengthens out again into a tapering process. At 

 the 30th foot the black bidentate subchaetal spine appears. 



The foot is supported by a pair of large black acicula with tapering ends. The 

 compound bristles are clearly bidentate and the comb chaetae have long terminal teeth. 

 The bristles are figured by Treadwell. 



The dental formula is 6 — 5 : 7 + 6 — 10. The under jaws have calcareous end-pieces 

 with jagged irregularly toothed edges. The upper jaws are well figured by Treadwell. 



E. artiadata, Ehlers, is treated by Treadwell as a synonym of the present species, 

 and a comparison of these specimens with Augener's account of his examples of 

 E. antillensis, Ehlers, from the Gulf of Guinea has made me strongly of the opinion 

 that E. antillensis is also a synonym of this species. Like the allied E. coccinea, it is 

 very variable in coloration and in the number and arrangement of the gills. 



Dili 16 



