370 PHYLLAXTINOE. 



and placed in front of the nuchal collar. The palpi appear to be smooth under a 

 low power, but when magnified 350 diameters are minutely papillose. The median 

 tentacle is absent. The lateral are small, somewhat enlarged at the base, and with a 

 filiform tip. They have a few short clavate cilia. According to Sars the tentacular 

 cirri also have a few clavate cilia. 



Body has forty-three bristled segments (Sars). The only available British example 

 is fragmentary. The segmental eminence is distinct, but the indifferent preparation 

 showed no differentiated papillae. 



Scales have, so far as present, a somewhat ovoid outline (Plate XXXIII, fig. 9), 

 with the exception of the first pair, which are rounded. The outer and posterior borders 

 have slender clavate cilia, which are longest externally, becoming short and sparse as 

 we proceed inward. Their entire surface is closely covered with short, blunt, and rather 

 soft spines, and thus they differ in certain respects from the figure and description 

 of Sars. 



Feet. — The first foot has a sharp spine and a group of four small bristles conforming 

 to the dorsal series. 



The typical foot presents dorsally a series of rather large, long, yellowish bristles, 

 which, though as conspicuous in size as those of A. finmarchica, are much less acutely 

 tapered, and have closer rows of spines. They are slightly curved (Plate XL, fig. 12). 

 The superior ventral bristles have somewhat shorter tips than in A. finmarchica, and 

 the rows of spines are not so distinctly separated. The tip is similar, viz. slightly 

 hooked ; but the spines become so elongated towards the tip that they project on each 

 side like a series of filaments (Plate XL, figs. 13 and 14). 



Xo dorsal cirri are present, but the ventral cirri are long and filiform with short 

 clavate cilia. 



This form appears to present the following differences from the species described by 

 Sars :— The anterior pair of eyes lie in front of the middle of the head, and are not visible 

 from the dorsum, whereas in the Norwegian form they are situated on the median lateral 

 eminence, and therefore considerably removed from the front. They are also seen from 

 the dorsum. The posterior pair of eyes are less widely separated in the British form. 

 It is difficult to compare the bristles, since some of the finer characters are lost in the 

 kind of plate adopted by Professor Sars, but they closely approach each other. The 

 scales, on the other hand, present certain divergences, e. g. in the presence of only 

 minute cilia in the northern form. 



Genus XVI. — Phyllantinoe, Mcintosh, 1876. 



Head short and broad; base (ceratophore) of the median tentacle passing far 

 backward between the prominent anterior peaks. Anterior pair of eyes much larger 

 than the posterior; pairs separated by a brief interval. 



Dorsal bristles short, stout, translucent, with prominent and close rows of spines, 

 and a short, acute, smooth tip. "Ventral bristles extremely slender ; spinous region long 

 and tapering, tips simple. 



In the absence of accurate information concerning the relations of such rare forms 



