356 EVARNE IMPAR. 



The second foot has a dense tuft of dorsal bristles which, though shorter than the 

 typical forms, already show the chief characters in regard to the rows of spines. They 

 have a more distinct curvature and less tapered tips than the succeeding forms. One or 

 two at the inner side (next the body) have the finer rows and aspect of those at the base 

 of the tentacular cirri. The ventral bristles have elongated spinous regions, the upper 

 and middle with slender bifid tips, the lower with simple tips. 



The foregoing, therefore, requires little change to assume the typical form (Plate 

 XXX, fig. 7), which has dorsally a fan-like group of translucent bristles, springing from 

 a prominent process, with rather acutely pointed tips, the bare portion being short. The 

 smooth tip is formed like a knife, the dorsal edge being bevelled to the ventral (next 

 the spines), and this shows in some a differentiation as in the figure. In lateral 

 views the somewhat wide spinous rows pass nearly at right angles across the 

 long axis and stand out prominently at the edge (Plate XXXIX, fig. 20), a condition 

 probably due to the nearly opposite condition of the rows. The aspect is thus different 

 from the more powerful bristles of Rarmothoe antilopis with the curved and oblique 

 spinous rows, which project very little at the edge. Such groups of bristles (dorsal) form 

 a gradational series under pressure, those next the body being proportionally thicker 

 and shorter — with more closely arranged spinous rows, the series rising to the much 

 longer and more tapered central, and then declining to the more slender forms adjoining 

 the ventral. Some of the latter are very slender — with finely tapered tips. Occasionally 

 these bristles are more curved and less tapered than usual. 



The ventral bristles are moderately elongate, and superiorly have a long, slender, 

 tapering spinous region — the rows appearing as oblique bars — and a minutely bifid tip 

 (Plate XXXIX, fig. 21). The spinous region becomes shorter and stouter, and the rows 

 of spines more delicate, while the tip is more distinctly hooked, and the secondary 

 process, which passes nearly straight out or with a very slight angle, is more evident 

 (Plate XXXIX, fig. 22, representing one of the lower median). Inferiorly the bristles 

 diminish in length, have a well-marked hook at the tip, and delicate oblique lines from 

 the fine spinous rows. The bristles throughout are pale, with a faint straw-colour. The 

 shape of the fleshy part of the foot is characterised by the length of both dorsal and 

 ventral processes for the spines. 



Posteriorly the bristles become shorter and more slender, the dorsal being propor- 

 tionally long and nearly straight, with well-marked rows of spines which are nearly 

 opposite, so as to differentiate these bristles from others. The ventral are also very slender, 

 and the tips in the terminal feet are so attenuate that it is difficult to make out the bifid 

 condition. Thecate infusoria are common on the dorsal bristles. 



The dorsal cirri are finely tapered, and present a slight enlargement towards the 

 filiform tip in life, whilst in spirit-preparations this is very evident, and more opaque than 

 the rest; and they are densely covered with long cilia with bulbous extremities, visible 

 under a lens. The ventral cirri are subulate, and also have a filiform tip which reaches 

 the bases of the ventral bristles. They have numerous short clavate cilia on the 

 surface. • 



A curious appearance occurs in both dorsal and ventral bristles of a specimen pro- 

 cured by Canon Norman in 1879 in Norway (Lervig Bay, three to twenty-five fathoms), 



