4Q Prof. M'lntosli's JVules from the 



dition of 1870 at No. 1 in 5G7 fathoms, aufl lias sixteen 

 pairs of bristles. The cephalic lobe has no dorsal collar, 

 and the plate arches over the month, a series of the usnal 

 grooved tentacles arising^ from its surface. It differs from a 

 Canadian Lophmiia in having a free ventro-lateral flap or 

 collar at each side of the cephalic plate. Behind this, on 

 the dorsum, another collar occurs on the succeeding seg- 

 ment, and it attains its maximum depth laterally — ceasing 

 as it reaches the ventral surface. 



The body is only slightly enlarged in front, and tapers 

 gently to the posterior end with its terminal anus. The 

 dorsum is rounded, the anterior ventral region flattened, 

 and the rest grooved posteriorly. The number of segments 

 is over thirty, but the example is incomplete. Eleven or 

 twelve ventral scutes seem to be present. 



Sixteen pairs of bristle-bundles occur anteriorly, each 

 having comparatively few bristles issuing from the somewhat 

 conical process. The longer bristles are translucent, shorter 

 than in the other form, and with a comparatively short, 

 wino^ed, tapering, terminal region. The tips have a slight 

 curvature. The shorter forms have only their tips projecting, 

 and their wings do not seem to be broader than those of 

 the lono'er bristles, and just a trace of a curvature occurs at 

 the tip. The first setigeroiis process is on the third segment. 

 Tlie number of the bristle-tufts agrees with Malmgren's 

 Scione, but the hooks so closely resemble those of La- 

 phania hoecki that further investigation is necessary. 



The rows of hooks aprear to commence with the bristles, 

 and anteriorly their outline (PI. I. fig. 12) approaches that 

 of Pista cristala, though they are considerably smaller. The 

 crown has at least five teeth above the main fang, the 

 anterior outline has a prominent median process with an 

 indentation below it and the prow is rounded. The pos- 

 terior outline has an eminence above the ligament, and the 

 inferior outline of the base is slightly convex. From the 

 liook of Pista cristata it is distinguished by its smaller size, 

 the shape of the crown, and the increased number of teeth 

 above the main fang, by the greater bulk of the base in the 

 hook of P. cristata, and by the difi'erence in the anterior 

 outline — chiefly caused by the deeper inflection beloAv the 

 median process. The posterior hooks are smaller, have a 

 proportionally larger crown, a more uniform anterior outline, 

 and do not usually show the powerful ligament at the pos- 

 terior end of the base. 



