OF THE 'PORCUPINE' EXPEDITIONS. 403 



torily, as every change of position alters the appearances. The tips become shorter 

 at the ventral edge ; but the terminal hook and secondary process remain. 



The specimen afforded a site for a swarm of Loxosomce, which occurred on the feet 

 and dorsum beneath the scales. MM. Audouin and M.-Ed wards mention that Blain- 

 ville^ figures a Polynoe scolopendrina which differs quite from that form in having scales 

 extending to the posterior extremity of the body ; they therefore term the form P. 

 blainvillii. In all probability the P. elegans of Prof. Grube^ refers to the same species. 



Lepidasthenia longissima, Blainville. Dredged in 45 fathoms off Cape Sagres, 1870. 

 The specimen is imperfect, consisting only of the anterior region. In external appear- 

 ance it is distinguished from the preceding by the somewhat large head, the small though 

 better-defined eyes, and the shorter bristles. The head has two tumid lobes on each 

 side. Eyes small ; the posterior pair are placed some distance in front of the posterior 

 border ; the anterior pair are further apart, and occupy the front of the lateral emi- 

 nence. Tentacles and palpi absent. Tentacular cirri similar to those in L. Mainvillii ; 

 the cephalic processes appear to be somewhat larger. The dorsum is brownish in 

 front in the median line, the pigment being transversely barred some distance behind 

 the head. The scales appeared to be similar to those in the former species ; but all 

 had been injured before preservation. The same sparsely distributed clavate cilia are 

 present. 



The feet are similar to those of L. blainvillii, having, when viewed from either sur- 

 face, bifid extremities and intermediate bristles. The dorsal cirrus, however, is longer, 

 and arises from a point nearer the extremity of the foot. The ventral cirrus is somewliat 

 larger at the base than in the former species ; and the row of clavate papillae running 

 from the cirrus to the inner ventral process is more distinct. The dorsal branch is re- 

 presented, as in the former, only by a single spine covered by the cutaneous tissues, the 

 whole forming a conical papilla. The ventral division of the foot has a series of bristles 

 with simple tapering tips and scale-like rows, the spinous region being much shorter 

 than in the former species, as observed in PI. LXXII. fig. 9, which represents one of the 

 superior bristles. Toward the ventral border the tips become still shorter (PI. LXXII. 

 fig. 10), with a slight hook at the extremity, and the spines are continued almost to the 

 latter. When the bristle is seen from the front or the back it is shaped like a feather, 

 since the tip is not so attenuate as in the superior series. In the figure the bristle is 

 slightly turned round, so as to show the rapid diminution above the commencement of 

 the spinous rows. At the ventral edge of the series a few have the shape represented 

 in PI. LXXII. fig. 11. 



' Diet, des Sc. Nat. art. Vers, p. 459, pi. x. f. 2. 



° Aetin. Echin. u. Wiirmer des Adriat. u. Mittelmeers, 1840, p. 85. 



VOL. IX. — PABT VII. January, 1876. 3 i 



