86 Prof. M-Iiitosli*3 Notes from the 



The bristle-tufts have stout simple forms witli tapering tips, 

 which have traces of wings, besides tho?e with spear-sliaped 

 dilatations, serrated eflges, and long tapering tips. The tufts 

 are smaller posteriorly, but do not differ iu structure. 



Each of the hooks presents seven teeth below the crown, 

 then follows a process with minute teeth, the trend of which 

 is from above obliquely outward, whilst its prow inferiorly 

 is bluntly conical. The shaft of the hook is short. 



The caudal process is tortoise-shaped, and usually bent at 

 more than a right angle to the dorsum, thus making a small 

 angle with the ventral surface. The rudimentary feet pass 

 obliquely upw'ard to the dorsal keel, toward the end of which 

 is, on each side, a considerable row of caudal hooks. The 

 dorsal surface of the process is flatter than in allied forms, a 

 median keel and symmetrically arranged transverse ridges 

 being on this surface. The rim is not much elevated, and 

 has two notches beyond the hooks, and in some a minute 

 papilla or two. The caudal hooks differ from those of 

 any other form, having a comparatively straight shaft, 

 which tapers toward the neck, then the neck bends a little 

 backward and gently forward at the tip so as to form a 

 strong point. As in other forms, the shaft is longitudinally 

 striated. 



The tube is large, nearly straight, and tapered to a small 

 extremity. Moreover.it is lined iti some by a comparatively 

 thick internal membrane, which readily separates from 

 the firm wall in the preparations. Its masonry, as a rule, 

 diti'ers from that of Lagis or Amphictene in so far as the 

 grains are smaller, and, even though in some the surface is 

 rendered irregular by projecting larger grains, the general 

 effect is characteristic. Typical examples on sandy ground 

 are smooth and finely grained, no sci)arate joints being 

 distinguishable. 



The second form is A}7i/>hictene auricoma, O. F. jNIiiller, 

 which is generally distributed all round the British coasts on 

 sandy ground. The crown in this species bears from eleven 

 to thirteen palcohe, which, in well-preserved examples, are so 

 brittle that few can be removed entire. They are flattened 

 golden bristles, which are a little narrowed at the base, 

 r(;main of uniform diameter for some distance, and then 

 tapc^r to a fine point, which is cither slightly curved or 

 boldly bent round like a hook, thus differing, for instance, 

 from those of Lagis koreni, which are coiled after the 

 manner of a watch-spring. The dorsal collar at the margin 

 of the flattened scabrous area above the paleolae is cut into 



