108 Prof. ^PlntosU's j^otes from tJie 



a right angle to the neck and is rather long. Four teeth 

 occur on the crown behind it, and a short tuft of gular 

 bristles springs from the throat immediately beneath it. 

 They do not reach the tip of the great fang. The crowns of 

 these hooks are little elevated, and thus differ from the 

 typical forms which those of the fifth foot more nearly 

 resemble. The bristles form conspicuous pale yellow tufts 

 in each foot, and one group has stout shafts, tapered tips 

 with wings ; the other translucent, slender, and with greatly 

 elongated hair-like tips and extremely minute serrations, 

 the wings being slightly developed. In the middle and 

 posterior regions of the body they are borne on long seti- 

 gerous processes which form a feature in the outline. The 

 typical hook, as at the eighth segment, has a remarkably 

 high crown, and neck and shaft are nearly equal in length. 

 The shaft dilates from the base up to the shoulder, then the 

 neck is constricted otf and again dilates to the toothed 

 hatchet-shaped crown, which, with its six or seven teeth, 

 rises high above the great fang. The latter makes less than 

 a right angle with the neck, and has a distinct indentation 

 of the throat beneath it, opposite which, on the side of the 

 hook or at the notch in the throat, a comparatively short 

 tuft of gular bristles on each side slopes upward and forward 

 instead of curving gently outward and bending round the 

 tip of the great fang as ordinarily seen under a cover-glass. 

 The neck is obliquely striated, and longitudinal striae occur 

 at the upper end of the shaft. Posteriorly little change 

 takes place in the structure of the hook, the proportions of 

 shaft and neck being nearly the same, but in the last row 

 the number of teeth above the crown is ereater. 



The tube appears to be free and to be composed of sand, 

 minute fragments of shells, foraniinifera, and secretion. 



This species, in 1868, was confounded with Ajciothella 

 catenata, Malmgren, and hence the differences between them 

 as indicated in a former paper*. Malmgren's description 

 and figure of A, catenata are excellent. 



Tl'.e fourteenth species is Axiothella catenata, Malmgren, 

 in which the head, with the cephalic shield, is of average 

 obliquity, that is, sloped from above downw^ard and forward, 

 and in lateral view the centre of the plate is somewhat 

 convex, whilst the anterior border droops a little. A small 

 process with a rounded anterior border occurs in the middle 

 line anteriorly — separated by a furrow on each side from the 



* Trans. Roy. Soc. Edin. vol. xxv. p. 420. 



