34 » (LESICIRRUS. 



The first foot has two minute spines, one slightly curved and tapered from base to apex, 

 the other with a shoulder and blunt tip. The second foot has on one side spines of the 

 foregoing shape, and on the other a modified hook, which has a shaft, narrowed at the base, 

 but thereafter nearly cylindrical to the shoulder and with a short, slightly tapered neck. 

 The main fang is rather long, makes more than a right angle with the neck, and has several 

 rudimentary teeth on the flat crown behind it. The third foot has on one side spines and 

 on the other a single large hook, similar to that in the foregoing foot, but with a more 

 distinct curvature of the shaft and enlargement below the shoulder. The fourth foot 

 shows a series of nearly normal hooks, which are smaller than those of the third, have a 

 marked curve of the shaft, which tapers from the base to the shoulder, the neck being 

 narrowest immediately beyond it, for it dilates thereafter to the crown, the great height of 

 which is characteristic. The main fang leaves the neck at a little less than a right angle, 

 and in lateral view has four or five teeth above it, sloping downward from the high crown. 

 Almost immediately beneath the great fang the gular bristles pass forward and curve 

 above the tip of the main fang. 



The neck is slightly striated obliquely, but though the enlargement below the shoulder 

 is somewhat opaque, strise are indistinct. The hooks vary very little from the typical 

 form (Plate CVIII, fig. 12 c), those of the last row in front of the funnel being perhaps 

 somewhat smaller, but having the same high crown, with at least five teeth above the 

 main fang, in lateral view. 



The bristles consist of the usual two groups, viz. those with stouter, straight shafts 

 (Plate CVIII, figs. 12 and 12 a) and tapered tips with distinct wings, and a dense group 

 of more slender forms with fine, hair-like tips (fig. 12 a), besides the spinous kinds 

 (Plate CVIII, fig. 12 6) which in the preparations are coated with particles and are 

 minutely spiked in the fresh examples. The bristles at the posterior end are of two kinds, 

 viz. proportionally stout, winged forms, and a few more slender, with brush-like spikes at 

 the tip. 



The small, cylindrical tubes are formed of secretion coated with sand-grains, minute 

 fragments of shells, and an occasional Foraminifer, whilst one or two are anchored by the 

 secretion to a small pebble, 



This appears to be the Clymene CErstedi, Claparede, which De St. Joseph considers 

 probably to be Clymene digitata, Grrube, for " deux entailles en aniere " of the border of the 

 head, which distinguish it from 0. digitata, are not mentioned or figured by Claparede. 



Genus CXXVII. — CiESiciRRUs, Arwidsson, 1911. 



Nuchal organ of median length ; distinct cephalic rim. Cephalic plate with evident 

 glands. Papillse of proboscis low or absent. Segment with collar absent. The feet of 

 the eighth setigerous segment toward the posterior part. Anterior segments with 

 distinct glandular bands. Achastous segments posteriorly, and behind is a callus-shaped 

 ring, then an anal cup. The ventral cirrus is longest, and the longer cirri, which are 

 symmetrically arranged amongst the others, have filiform tips ; the shorter have split 

 tips. Anal cone low — at the bottom of a funnel-like depression, and anal papilla? drawn 



