EYAENE JOHNSTONI. 359 



The head (Plate XXVII, fig. 7, from a large example, and fig. 12, small example), 

 has the same form as in E. impar, and is pale throughout in the preparations, the absence 

 of pigment at the base of the tentacle being noteworthy. The eyes appear only as 

 minute black points ; two lie at the posterior border of the head, almost hidden by the 

 collar; two laterally in front of these, as in the ordinary species. A variety dredged 

 by the 4 Porcupine ' in 1870 at 690 fathoms has very large eyes (Plate XXVII, fig. 7), 

 the anterior pair having a lens-like corneal thickening. Adult Norwegian examples 

 show still further increase in these organs. 



Body apparently similar in shape to U. impar, viz. abruptly diminished in front and 

 gently narrowed from behind the anterior third. The dorsum has a deep brownish hue, 

 with a tinge of purple in front — from the proboscis. Behind the latter the pigment is cut 

 into bars by the pale belt at the junction of each segment. The ventral surface is pale, 

 the margins of the oral aperture alone being deeply tinged with brown. The segmental 

 eminence is distinct, but the papilla is minute. 



In the examples the proboscis is more or less extruded, and the usual number of 

 conical papilla (nine) fringe each lip. 



Scales. — A single reniform scale occurred in the vessel, and from what is observed 

 in the examples from Norway it would seem to belong to the specimen. The surface, 

 with the exception of the inner fifth, has rather large conical horny papillae, often with 

 blunt spinous tips, while the adjoining external and part of the posterior border have a 

 few long and very slender cilia, with a somewhat fusiform tip. The contrast, therefore, 

 with the more densely and minutely spinous scale of U. impar is marked ; the cilia, 

 moreover, on the outer edge of the scale of the latter are more numerous, larger and 

 longer, and globose at the tip. 



Feet. — As in E. impar, the second foot presents shorter dorsal bristles with less 

 tapered tips, but otherwise they are of similar structure to the succeeding. The ventral 

 bristles of this foot do not project more than the dorsal, and hence are short as well as 

 slender, the long attenuated spinous region ending in a hair-like tip. 



In the typical foot (Plate XXX, fig. 6) the dorsal division bears longer and more 

 slender bristles than in JE. impar, the slight tapering towards the tip being a noteworthy 

 feature, and the rows of spines are even more distinctly marked. The smooth terminal 

 portion is decidedly shorter than in the latter, and in some cases it presents a slight mucro 

 at the extremity, then a shallow notch, and another elevation a little above the first row 

 of spines. A long clear shaft projects beyond the foot before the rows of spikes appear, 

 so that the bristles are comparatively long. One of the stronger bristles is represented 

 in Plate XXXIX, fig. 23, while the tendency to differentiation of the tip is observed in 

 fig. 24, Plate XXXIX. The superior ventral bristles have tips so attenuate that it is 

 difficult to make out their structure; but the bifid condition is present, with the 

 exception perhaps of the first. The next series have much longer and stronger distal 

 regions, with extremely delicate and translucent bifid tips ; the terminal hook is short 

 and very slightly curved, and the secondary process is rather short and broad, and passes 

 far up, while the rows of spines are distant and well marked. The tips of the succeed- 

 ing (lower) bristles become broader and shorter, but the character of the termination 

 remains the same. Toward the inferior edge the tip is simple, only a faintly developed 



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