REPORT ON THE ANNELIDA. 
177 
The specimen is very much injured, so that it is not possible to give a satisfactory 
description. 
The general aspect somewhat resembles that of Greeffia {Nauphanta). It is marked, 
with brownish bars dorsally, and has the dark brownish “ segmental ” glands behind each 
foot anteriorly. The head is distinguished from that of its congeners by the presence of 
four eyes, two of which, however, are rudimentary. Dorsally (PI. XXVIII. fig. 8) tv70 
enormous eyes occupy almost the entire surface of the head, the cornea of each being 
directed outward, and the lens appearing in the centre laterally. The dorsal curves of 
the eyes seem to have been occupied by reddish-brown pigment, deepest at the margin of 
the cornese. Interiorly each cornea adjoins an ovoid pale area, the long axis of which is 
directed forward and inward. This pale surface is much softer than the cornea and lens 
above it (that is, of the upper eye), and is surrounded by a ring of reddish-brown 
pigment. Very weU marked inferiorly. It is an accessory eye, looking outward and 
forward, with a slight tendency downward. 
The snout is terminated by a crenated central margin, which hardly projects beyond 
the anterior curve of the eyes. This bears four tentacles, two at the outer margin 
dorsally, and two at some distance on the ventral surface. The interval between the 
dorsal and ventral pairs is larger than any yet observed, and is interesting as bringing 
the ventral pair nearer the ventral eyes. Between the great dorsal eyes a small papilla 
lies in the central streak. This is probably a rudimentary tentacle. The proboscis has 
the usual pair of filiform processes, and no hard parts occur in its interior. 
The condition of the feet precludes further remark than that the setigerous region 
seems to be pointed. No bristles are present. 
As indicated, the body is very soft, but in the section a somewhat thick cuticle occurs 
externally in the ventral median line, followed by a thin layer of hypoderm, which 
increases in thickness at the nerve-area. The circular muscular coat is indistinct, the 
only fibres observed being those crossing the nerve-area. The oblique muscles pass 
downward over the inner surface of the ventral longitudinal series, and appear to become 
connate below the nerve-cords, some fibres, however, apjDarently passing above the latter, 
and thus surrounding them. The size of the nerve- cords is moderate, and their shape 
ovoid. 
Alciopa (1) (PL XXXII. fig. 13). 
Habitat . — Two fragments, without heads, were procured on the surface of the sea, off 
Honolulu, Sandwich Islands, July 1875 ; surface temperature about 76°'0. 
The colour of both is pale or slightly brownish at some points, and with a dark brown 
“ segmental” gland behind each foot. The latter (PI. XXXII. fig. 13) has a somewhat 
(ZOOL. CHALL. EXP. — PART XXXIV. — 1885.) LI 23 
