DR. BATRU OX TWO NONDESCRIPT LARVAL ANNULOSA. 249 



Sp. 2. Thetisella OLIVACEA. (Plate VI. figs. 1-4.) 



Body of animal of au 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 present exactly the same character in form 

 as those in flava, with a number of the shorter and stouter swol- 

 len setae interspersed among them (Plate VI. figs. 5 & 6). The 

 setae altogether are nearly double the length of those oi fiava, 

 and the swollen portion of the shorter setae are very distinctly 

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

 11 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 flava, while the rings in the middle line are dis- 

 tinctly hollow or depressed in the centre. The organs which I 

 at first considered metamorphosed branchiae are disposed in the 

 same manner as those of flava, the setae 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 setae) nearly \ an inch. 



Sab. Philippine Islands, Cwning (Mus. Brit.). 



EXPLANATION OF THE PLATES. 



Plate IV. Set(S of feet of Amphinomidm. 

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

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

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

 Fig. 2 b. Venti-al seta of ditto. X ditto. 

 Fig. 3 a. Dorsal seta of Hermodice caruncidata. X ditto. 

 Fig. 3 b. Ventral seta of ditto. X ditto. 

 Fig. 4 a. Dorsal seta of Enri/tho'e complanata. X ditto. 

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

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

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

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

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

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

 Fig. 7 b. Dorsal seta of ditto, without teetli or serr;^^ X ditto. 

 Fig. 7 c. Dorsal seta of ditin, of tlie whole length. X 20 diam. 



