416 STHENELAIS ATLANTICA. 



downward, and witli papillae like those of 8. zetlandica. The bristles are similar, though 

 in the smaller specimen finer. The ventral lobe is conical, with long papillae,— as 

 in 8. zetlandica. The upper ventral bristles have about six rows of spines at the 

 dilated distal region of the shaft, and the terminal process has three or four segments. 

 The tips are slender a!nd bifid, the secondary process having no appreciable angle to the 

 axis. The next lower forms are stouter, with a beak-like extremity. The inferior 

 bristles are slender, with about two rows of spines at the end of the shaft, and a 

 tapering terminal appendage of two or four divisions, bifid at the tip. Apparently three 

 ciliated pads (ctenidia) occur on the dorsum. The ventral cirrus is slender, and rather 

 shorter than the fleshy part of the foot. 



Synonym. 

 1876. Sthenelais atlantica, Mcintosh. Trans. Zool. Soc, vol. ix, p. 405, pi. lxxii, f. 16, 17. 



Habitat.— Prom the entrance of the British Channel to the Atlantic deeps in 

 305 fathoms, Station 2, < Porcupine,' 1870. The ground seemed to have been sandy. 



Head (Plate XXIX, fig. 2) somewhat ovoid in outline, a small subulate tentacle with 

 a terminal joint in front, and a pair of eyes situated close together on each side near 

 the base (ceratophore) of the organ. The palpi are very long, smooth, and tapering, 

 and the tips of the tentacular cirri show a terminal joint as in the median tentacle. 



Body.— Slightly narrowed in front, but as the feet project laterally and forward, the 

 outline anteriorly is really broad and gently curved laterally. Only about 10 mm. of 

 the body remain, and the specimen appears to be small. 



Scales (Plate XLI, fig. 27) somewhat thin, rounded or ovoid in front, reniform 

 throughout the rest of the fragment, covered with sparsely distributed but distinct 

 clavate papillae, and having a fringe of short clavate cilia, which are only absent from 

 a portion of the inner and adjoining anterior margin. Four of the longest, indeed, occur 

 on the outer lobe of the anterior margin near the hilus. They are longest anteriorly. 

 The cilia (Plate XLI, fig. 27) are decidedly longer and more slender, as well as more 

 numerous than in 8. zetlandica, and palpocils occur frequently on the extremity. 



Feet (Plate XXX, fig. 14) resemble those of 8. zetlandica, having a projecting 

 dorsal lobe bevelled from above downward, and the papillae have similar dimensions. 

 The bristles are somewhat finer, and the serrations or spinous rows closer, but the 

 specimen is smaller. The ventral lobe is conical, with similar long papillae, the secondary 

 processes or warts at the tip of these being distinct. The superior ventral bristles 

 (Plate XLI, fig. 28) have about six rows of spines at the dilated distal regions of the 

 shaft; and the terminal appendage has three or four segments, the basal, in the case of 

 those possessing four, being about as long as the three distal. The tips are slender and 

 bifid, the secondary process having no appreciable angle to the axis, so that it lies 

 close to the hook. The next lower series are stouter, with about four distinct spinous 

 rows on the distal end of the shaft, and a terminal appendage of one or two segments, 

 the tip resembling the beak of an eagle. The inferior are slender, with about two 

 rows of spines at the dilated end of the shaft, a terminal appendage of two or four 

 divisions, and a tapering, delicately bifid tip. The shafts of all the ventral bristles have 

 a backward curve distally. A branchial process, and apparently three ciliated pads 



