EEPORT ON THE ANNELIDA. 
519 
body of the hook in a direction parallel to the dorsal line. The sinus beneath the great 
fang is somewhat larger than in the type formerly described. The posterior uncini show 
a much more elevated crown, a more distinct inflection of the dorsal line, and about eight 
teeth above the great fang. 
The food of this species consists of mud, containing numerous Diatoms, several flne 
varieties of Challengeria, small bivalves, minute ova, and other structures. 
The tubes have less of the free habit noticeable in the former type of Serpula 
narconensis, being attached to shells, sea-weeds, and sponges; several tubes, moreover, 
being frequently connected together by their sides. The trumpet-like expansion of the 
terminal portion of each tube is well developed, and the rings thus formed, by apparently 
alternate stationary intervals and periods of active growth, occur toward the anterior 
ends, but they are fewer in number than in the much larger form from Kerguelen. 
Some of the tubes are tinted of a pinkish hue, as in Serpula vermiculojris, and there is 
a greater tendency to form coils on shells and other organisms than in the previous 
type, the anterior portion of the tube projecting upward in a more or less erect condition, 
as in Serpula vermicularis. 
The body-wall of this form is slow in assuming the typical arrangement, since 
section at a corresponding point in the anterior third shows a more delicate arrangement 
of the hypoderm, the thicker ventral belt diminishing toward the middle line. The 
massive dorsal longitudinal muscles are separated by a wide median interval, and they 
pass toward the wall of the alimentary canal interiorly. The longitudinal ventral 
muscles are lateral in position, the large nerve-cord being below them. Moreover, no 
neural canal is visible. The very long ventral hiatus has from the nerve-cord inward 
the following structures, viz., a band of fibres from the inferior edge of the longitudinal 
dorsal muscle, a series of fibres connected with the sheath of the alimentary canal, and 
which pass from the median hiatus of the dorsum to form a loop over the ventral median 
line, lastly a thin plate of longitudinal fibres within the circular coat on each side of 
the central region. 
The relation of Kinberg’s Zophyrus loveni, from the same locality, to this species is 
uncertain. 
Serpula philippensis, n. sp. (PI. LIV. fig. 7; PL XXIXa. fig. 28). 
Habitat . — Trawled at Station 205 (olf the Philippine Islands), November 13, 1874; 
lat. 16° 42' N., long. 119° 22' E. ; depth, 1050 fathoms; bottom temperature 37°’0, 
surface temperature 82°’0 ; sea-bottom, blue mud. 
This small form is fragmentary, its tube being attached to what appears to be a 
piece of wood. The tube (PL LIV. fig. 7) is coiled in various ways, the smaller end 
being marked by two longitudinal furrows, while the larger anterior end exhibits these 
