352 ASYCHIS JEFFREYSIL 



the Oceanographical Museum at Monaco that Fauvel's example with twenty bristled 

 segments and only a single segment without bristles posteriorly was this species. 



Fauvel (1909) adheres to the genus Maldane of Malmgren for this species, and 

 points out in reply to Arwidsson that neither De St. Joseph nor Orlandi in their revision 

 of the Maldanidge cared to revive the genus Asychis of Kinberg. 



2. Asychis Jeffkeysu, 1 n.s. Plate CI, figs. 6 and 6 a— head; Plate CVIII, fig. 13— hooks. 



Specific Characters. — The rim of the cephalic plate has four subulate processes 

 anteriorly on each side, the frontal plate is not separated by notches, and the posterior 

 margin is more minutely serrate than in A. biceps. The fissure behind the antero-lateral 

 papillae is deep. The nuchal organs form a loop on each side with the convexity directed 

 forward, the inner limb of each abutting on the broad median ridge which commences 

 posteriorly about a third of the distance forward. Combined cephalic and buccal regions 

 somewhat shorter than in A. biceps. 



Foot with strong capillary bristles, many with finely tapered and spiked tips, with 

 a very narrow wing beneath ; and slender forms spiked from a short distance above the 

 base to the tip. 



Hooks boldly curved with about five teeth above the main fang, which makes a little 

 less than a right angle with the neck. Curve between the main fang and the prominent 

 process for the gular bristles. The neck is somewhat long and constricted above the 

 shoulder, and the shaft is long. Other characters as in A. biceps; but the anal region is 

 unknown. 



Synonym. 

 1913. Asychis ?, fragment. Ann. Nat. Hist., ser. 8, vol. xi, p. 118. 



Habitat. — Dredged in the ' Porcupine ' Expedition of 1870 off Cape Finisterre in 81 

 fathoms. 



The cephalic plate (Plate CI, figs. 6 and 6 a) in this form is distinguished at once 

 from that of A. biceps by the presence in lateral view of four subulate processes on each 

 side anteriorly, by the more minutely serrate condition of the posterior border, by the 

 absence of a notch separating the anterior plate on each side from the region of the 

 papillae, and by the less prominent frontal margin. The fissure behind the region of the 

 papillae is deep, and is continuous with a furrow on each side of the neck. Moreover, the 

 curves of the nuchal organs differ 3 since, instead of forming a semicircle in the mid- 

 cephalic region, the groove forms a loop with the convexity directed forward and the limbs 

 backward, the inner limb of each abutting on the broad median ridge, which commences 

 posteriorly about a third of the distance forward. The whole aspect of the plate thus 



diverges. 



It is not possible to give a detailed account of the body of this form, for only frag- 

 ments of the anterior region are known, but so far as can be observed the combined 



1 Named after Dr. Gwyn Jeffreys, who did much for the collection of rare annelids. 



