STHENELAIS JEFFKEYSIL 423 



distal ends of the shafts, and a most delicate tapering terminal process with a hair-like 

 tip, and comprising fourteen or fifteen segments, the basal being much longer than the 

 others (Plate XLII, fig. 6, which shows a bristle somewhat compressed by others). Below 

 the spine are some with shafts considerably stronger, and with less delicate and less 

 numerously jointed tips, which, however, end in a fine point. From the spine to the 

 inferior lobule of the foot somewhat strong shafts of similar character are distributed, 

 the inferior especially showing one or two rows of spines on the dilated distal region, 

 while the terminal processes are of several kinds. The upper have a single terminal 

 division consisting of a segment with a well-marked claw and secondary process which 

 fills up the concavity. Just above the inferior lobule of the division are some with three 

 segments in the terminal region, viz. a basal two thirds the entire length, and two short 

 distal articulations, the last with a claw. A few have only two segments (Plate XLII, 

 fig. 7). The inferior series, arising below the lower lobule, are delicate translucent 

 bristles, having one or two rows of spines on the distal part of the shaft, and a long 

 terminal process of six or seven articulations (Plate XLII, fig. 8), the secondary process 

 filling up the hollow. Ventrally three series thus occur : (1) the stronger superior with 

 tapering filiform tips ; (2) the stout shafts with the short tips, of one, two, or three 

 articulations ; and (3) the slender inferior with long, tapering, bifid tips. All are very 

 delicate and translucent, and the basal region of the terminal process is often wrinkled. 



The necessity for carefully regarding the nature of the bristles is well illustrated in 

 a very closely allied form brought by Canon Norman from Norway, and which in almost 

 all its characters corresponded with the present species. A glance at the bristles of the 

 Norwegian form showed that the dorsal series were much denser; the upper ventral 

 series had nine or ten rows of spines at the distal end of the shaft, and a short acutely 

 pointed terminal region of nearly a dozen segments. A series with more numerously 

 jointed (eighteen to twenty articulations) and finely tapered tips followed, the shafts having 

 two or three articulations in the upper examples, the rest being smooth; then a 

 group with a single distal segment ending in a well-marked claw and secondary process ; 

 below was a group with similar shafts, but with tapering jointed terminal pieces ending 

 in a hair-like tip ; finally, the ventral series consisted of delicate bristles, with a slender 

 terminal region of about five articulations and a bifid tip. The differentiation thus at 

 every step was made clear. 



The ventral cirrus is subulate, with an articulation at the tip, and extends nearly as 

 far as the end of the fleshy part of the foot. 



Habits.— Only a single example has been obtained, so that it would not seem to 

 stretch to shallower waters. Where so much difficulty exists in capture and examination 

 it is unsafe, however, to make statements on this head. The species is sufficiently 

 defined, and should easily be identified. It probably frequents a sandy bottom. 



This form clearly leads through Eusthenelais to Leanira. 



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