284 CEYLON PEARL OYSTER REPORT. 



Lysidice collaris, Ehrenberg and Grube. 



Grube, 'Ann. Semp.,' 1878, p. 166; Gravier, 'Arch. Mus. Paris' (4 ser.), ii., 1900, p. 272. 

 Crossland, ' P. Zool. Soc, London,' 1904, p. 284. 



Station V., off Chilaw, Gulf of Manaar, 11 fathoms. One specimen; length 

 about 15 millims. Several other specimens in the collection. 



Nematonereis unicornis, Schmarda. 



Schmarda, ' Neue Wirbellose Thiere,' ii., 1861, p. 119. (Atlantic Ocean.) 



Locality : South-west Cheval Paar, Gulf of Manaar. Two specimens. 



In the smaller specimen the head is entire and rounded ; in the larger slightly 

 emarginate ; a pair of large eyes at the hack of the head and between them a small 

 occipital tentaculum impar about the same length as the prostomium. There are no 

 tentacular cirri ; no branchiae ; two achaetous buccal segments. The larger specimen 

 is a mature female. 



In the parapodia the dorsal cirrus is short, subulate, about as long as the pharetra 

 setarum ; a central acicula separates the setae into superior and inferior groups, 

 the former consisting of simple capillary setae, the latter of compound, bidentate, 

 falcigerous seta?. In the posterior bundles there is also a guarded bidentate acicular 

 seta, the subterminal tooth much larger than the apical tooth. The jaws are pale 

 and normal : II. 5-4, III. 4. 



Family : LUMBRICONEREIDiE. 

 Aglaurides fulgida (Sav.) Plates IV. and V., figs. 106 and 107. 



Gulf of Manaar. Several specimens. 



The largest measured as much as 7 inches in length, a few segments missing 

 behind ; dorsum very convex ; width 5 millims. ; width including setae nearly 

 9 millims. ; segments narrow and very numerous ; dorsal cirri large, foliaceous ; head 

 rounded to triangular in shape. 



The characterisation of the cirrobranchiate Eunicea is at present somewhat obscure, 

 and it is not rendered less so by the fact that the present species agrees identically 

 with Schmarda's GZnone diphyllidia from Jamaica in respect of the size and shape 

 of the dorsal cirri, the buccal and the parapodial armatures.* (Plate V., fig. 107.) 



The buccal segment is of double nature, as in Lumbriconcreis, the intersegmental 

 groove being plainly visihle at the sides and continued forwards to the edge of the 

 mouth, so that the processus oralis of the second segment borders the mouth helow. 

 Dorsally the buccal segment lies over the back of the prostomium like a collar, the 

 groove between the collar and the head deepening into a profound sinus, in which 

 three minute papillifbrm occipital tentacles are occluded. In front of the tentacles 

 there are four eyes, two large lateral eyes and two small submedian eyes, the latter 



* Cf. Ehlers, ' Florida-Anneliden,' 1887, p. 109, Taf. 34. 



