438 Dr. Johnston on the British Aphroditacecc. 



Palmyra ocellata, Johnston in Zool. Journ. iii. 329. 



Hab. Amongst Confervae between tide-marks. Berwick Bay, rare. 



Desc. Worm half an inch in length, scarcely a line in 

 breadth, almost linear but a little narrowed behind, rounded 

 at the extremities, flattened, of a yellowish-brown colour, 

 dusky along the sides, and marked there with a series of paler 

 round spots indicating the point of fixture of the scales : head 

 small and obscurely defined, corneous : eyes two, very distinct, 

 black, placed backwards : palpi,\ong, conical, smooth, jointed 

 at the base, pointing forwards : antenna five, the outer pair 

 larger than the three intermediate, and fringed on the inner 

 sides with a few fleshy spines ; the odd antenna superior and 

 small : mouth inferior, provided with a firm cartilaginous pro- 

 boscis armed with two pairs of jaws similar to those of the 

 Sigalion, but the orifice appears to be plain : body with about 

 forty pairs of feet, which seem to be all alike and destitute of 

 tentacular cirri, but we find two minute fleshy papillae near 

 their bases on both the dorsal and ventral sides : the feet are 

 not distinctly divided into two branches, but there is a fleshy 

 fold behind the apex, and within which the apex can be re- 

 tracted : from this fold there originate two bundles of simple 

 bristles, one dorsal and the other ventral, the bristles short ; 

 the apex itself is armed with a bundle of compound bristles, 

 jointed near the point and fashioned like those of a Polyno'e : 

 to each brush of bristles there is a conical spine placed in the 

 centre of the brush. The back of the worm is partially co- 

 vered with a row of scales placed over the bases of the feet 

 down each side, but the middle of the back is naked : there 

 are fourteen pairs of scales, some of them round, others oval, 

 all spinous on the outer edge, smooth, raised in the centre : 

 belly smooth, flesh-coloured: posterior extremity without 

 styles. 



Plate XXIII. Fig. 1. Pholo'e inornala, of the natural size. 2. The ante- 

 rior portion of the body, magnified. 3. The proboscis laid open, magnified. 

 4. Two of the dorsal scales. 5. The foot. 



4. Sigalion*, Audouin and M. Edwards. 



This genus is distinguished from every known Annelide by 



* Perhaps formed from atyu^otti — curiously or anomalously made — but 

 Sigalion is a name of Harpocrates, the companion of Esculapius and Hygeia, 

 by whom physicians were obliged to swear that they would observe a reli- 

 gious silence in their profession. See Sprengel, Hist, de la Medecine, i. 136. 



