46 Prof. M'lutosirs Xulcs from (he 



ditiou of 1870 at No. 1 in 567 fathoms, and lias sixteen 

 pairs of bristles. The cei)lialic lobe has no dorsal collar, 

 and the ])latc arches over the month, a series of the nsnal 

 grooved tentacles arisinj; from its surface. It difiers from a 

 Canadian Laphania in havinjj a free ventro-lateral flap or 

 collar at eacli side of the cei)halic plate. Behind this, on 

 the dorsum, anotlicr collar occurs on the succeeding; sep;- 

 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 bristlc-l)uudles 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, 

 winged, tapering, terminal region. The tips liave a slight 

 curvature. The shorter forms have only their tips projecting, 

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

 the longer bristles, and just a trace of a curvature occurs at 

 the ti]). The first setigerous i)rocess is on the third segment. 

 The number of the bristle-tufts agrees with Malragren's 

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

 phania hoecki that further investigation is necessary. 



The rows of hooks apuear to commence with the bristles, 

 and anteriorly their outline (PL 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 

 hook of Plsta 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 

 liook of P. cristata, and by the difference in the anterior 

 outline — chiefly caused by the deeper inflection below the 

 median process. The posterior hooks are smaller, have a 

 jjroportionally larger crown, a more uniform anterior outline, 

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

 terior end of the base. 



