30 



specially distinct. The neural region is distinguished by its 

 darker hue in front where no lateral pigment is, and hy its pallor 

 in the middle of the darker posterior region. A touch of pig- 

 ment marks the base of each ventral cirrus at the anterior part 

 of the coloured region, then various bars of dark pigment occur 

 on the under surface of each foot, the whole having a character- 

 istic arrangement. 



The head is slightly leaden in hue, with a deep notch filled 

 by the brown base (ceratophore) of the median tentacle in front. 

 Two eyes of moderate size lie posteriorly near the nuchal 

 border, whilst two less distinct occur towards the anterior 

 angle, though they were so hidden by parasitic Loxosomixi that 

 doubt remains as to their precise position. The median ten- 

 tacle is comparatively short, little tapered, and ends in a slender 

 filament. The lateral are typical in length and also have 

 slender terminal processes. The palpi are marked by longi- 

 tudinal cirri closely arranged, especially ventrally. The tentacu- 

 lar cirri have the same shape as the median tentacle. 



The body is elongate, slightlv narrowed in front, remains for 

 some distance of nearly equal diameter and then gently dimin- 

 ishes throughout more than the posterior half towards the tail, 

 which has two short cirri. Yentrallv a median lozenge of pigment 

 passes to the mouth. The anterior third of the body has 

 numerous Loxosoma? between the feet and at the tentacular 

 cirri. The bristles project on each side as pale yellow fasciculi. 



The first pair of scales are paler than the succeeding, but 

 have a similar pattern, viz., an ovoid pale patch at the scar, with 

 a dark band traversing it. The broad crescent of pigment 

 along the inner border, however, is less marked both in super- 

 ficial extent and tone than in the succeeding scales. They 

 adhere with considerable tenacity. In outline, the front pair 

 are more or less circular with a projection opposite the pale 

 region. The others are somewhat ovoid, the pale region being 

 at one end, and the bar by-and-by becomes a spot. Though 

 apparently smooth to the naked eye, minute and somewhat 

 clavate papilla? are scattered over the surface, here and there 

 appearing beyond the margin, as near the white spot (where 

 they are specially numerous), and other parts. 



The pale outer region ha^' numerous small clavate papilla?, 

 some of which extend beyond the border, and a few short 

 papillae also project at intervrtls from the inner border. 



The typical foot resembles that in Poh'iioc scolopciidriiia, 

 Savigny, 3^et Schmarda gives "pinna unica," as one of the 

 specific characters, though he probably means apparently 

 single. It really has two divisions. The foot forms a short 

 cone with a bevelled tip (Plate I. fig. i). The dorsal cirrus is 

 comparatively short and slightly tapered, with a slender filiform 

 tip. The surface has numerous short clavate papilla? which are 



