REPORT ON THE ANNELIDA. 
233 
The bristles of the inferior tuft are translucent. The terminal or dilated portion of 
the shaft presents minute serrations along its convex edge, and the distal articulation is 
comparatively short, resembling that observed in Onuphis and others. It has a boldly 
bifid tip (PI. XVIIa. fig. 10) with a thin process or guard. 
All the bristles are very much larger than those of any known example of the genus. 
The cuticle seems to be thin, but the hypodermic tissue is largely developed, both on 
the body- wall and the dorsal cirri, which have long parallel vessels running from the 
centre to the circumference. These organs (which appear to be blood-vessels) are 
probably branchial in function. The circular muscular fibres are well develojDed, both 
dorsally and ventrally, and the vertical and oblique are strong. The longitudinal ventral 
muscles are elliptical in section, and apj^ear to be formed of a double fold. The nerve- 
cords, as usual in the group, are very large. The alimentary canal has a very regular 
series of folds internally, each fold being somewhat dendritic in section. 
The dorsal cirrus and other parts of the foot of this form approach the structure of the 
foot of the Anisoceras of Grube,^ from St. Catherine on the coast of Brazil. The head 
and other parts of the latter clearly demonstrate its connection with the Stauro- 
cephalidse, and Grube indicates in his description and outline of the foot that the inferior 
bristles are jointed. Two brownish-red bars occur in each segment. Grube in this 
paper does not mention its relationships, but Ehlers and he^ do so subsequently, the 
genus being merged into Staurocephalus. The Staurocephalus loveni of Kinberg,^ from 
Port Jackson, Sydney, differs in having a shorter dorsal cirrus, in the position of the 
ventral cirrus, and in the presence of eyes. 
Staurocephalus atlanticus, n. sp. (PL XXXVI. figs. 4, 5 ; PI. XVIIa. figs. 5-8). 
Habitat . — Procured by the dredge at Station 73 (west of the Azores), June 30, 1873 ; 
lat. 38° 30' N., long. 31° 14' W. ; depth, 1000 fathoms; bottom temperature 39°’4, 
surface temperature 69°'0 ; sea-bottom, Pteropod ooze. 
A few fragments of this comparatively large example of the genus occurred. The 
longest (anterior) portion measures about 7 mm., and has a diameter of 1'5 mm. 
The head (PL XXXVI. fig. 5) is well marked, forming anteriorly an elongated blunt 
cone, without trace of eyes, and having at each side a short tentacle. No other process 
remains on the head. The mouth opens interiorly in the buccal segment immediately 
behind the former. The dark teeth shine through the body-wall in the next segment 
(which bears no foot). 
The body is more rounded dorsally than ventrally, and divided into very distinct 
segments. The two somites behind the head are devoid of feet, but the third has 
^ Archivf. Naturgesch., 1858, p. 213. ^ Op. cit. ® Ofversigt k. Vetensk.-Akad. Fdrhandl., 1864, p. 5T4. 
(ZOOL. CHALL. EXP. PART XXXIV. 1885.) LI 30 
