DB. liAIRD ON TWO NONDESCllIPT LAllTAL ANNULOSA. 249 



Sp. 2. Thktisella OLiVAOEA. (Plate .VI. figs. 1-4.) 



Body of aBimal of an olive-colour, short, nearly as broad as 

 long. Setiferous tubercles of feet long, and terminating in a 

 sharp point. The setae are implanted at various distances upon 

 the tubercles, and preseiit exactly the same character in form 

 as those in Jlava, with a number of the shorter and stouter svi^ol- 

 leu setsB interspersed among them (Plate VI. figs. 5 & 6). The 

 setsB altogether are nearly double the length of those oi Jlava, 

 and the swollen portion of the shorter setse are very distinctly 

 visible to the naked eye. The segments of the body are about 

 II in number, distinct on the back, but indistinct underneath. 

 The dorsal surface (fig. 1) is very rough, with numerous minute 

 granulations. The ventral surface (fig. 2) is smooth and armed 

 on the anterior portion with two pairs of similar hook-pointed 

 organs as in Jlava, while the rings in the middle line are dis- 

 tinctly hollow or depressed in the centre. The oi-gans which I 

 at first considered metamorphosed branchiae are disposed in.^-lje 

 same manner as those of Jlava, the seta? or filaments being 

 placed in a stellate form, but having the points straight instead 

 of being curved. The proboscis in this species is partially ex- 

 truded, and exhibits a fringe of short fleshy tentacles, about nine 

 in number, the centre one being cruciform at the apex (fig. 4) 

 {vide description of organs of mouth in explanation of plate). 



Length about | an inch ; breadth of body about 3 lines, but 

 (including setse) nearly | an inch. 



JIab. Philippine Islands, Cmning {Mus. Brit.), 



EXPLANATION OF THE PLATES. 



Plate IV. Setm of feet of Amphinomida. 

 Fi". 1 a. Seta of dorsal row of feet of Amphinome rostrata. X 50 diameters. 

 Fig. 1 b. Seta of Tentral row of ditto. X ditto. 

 Fig. 2 a. Dorsal seta of Amphinome Jukesi. X ditto. 

 Fig. 2 6. Ventral seta of ditto. X ditto. . 



Fig. 3 a. Dorsal seta of Hermodice carunculata. X ditto. . t . 



Fig. 3 b. Ventral seta of ditto. X ditto. ,'> . 



Fig. 4 a. Dorsal Beta, of Eurt/tkoe complanaia. X ditto., 11 . . 



Fig. 4 6. Ventral seta of ditto. X ditto. 

 Fig. 5 a. Dorsal seta of Eurythoe clavata. X ditto.. 

 Fig. 5 b. Ventral seta of ditto. X ditto. 

 Fig. 6 a. Dorsal seta of Lirione Eayneri. X ditto. 

 Fig. 6 b. Ventral seta of ditto. X ditto. 



Fig. 7 a. Dorsal seta of Chloeia tumida. X ditto. i. 



Fig. 7 h. Dorsal seta of ditto, without teeth or sernr. X ditto. ! 



Fig. 7 c. Dorsiil seta of ditto, of the whole Iciigtli. X 20 dijun. : 



