278 
THE VOYAGE OE H.M.S. CHALLENGER. 
In transverse section a prominent feature is the very large size of the dorsal longi- 
tudinal muscles in comparison with the ventral. The greater part of the area in the 
preparation of the body is occupied by the four muscular bands. The dorsal masses form 
almost a half moon, while the ventral are ovoid. A considerable incurvation exists 
on the ventral surface at the nerve-area, which is of moderate depth, and has the 
neural canal inferiorly. Superiorly the area is bouuded by the oblique muscles which 
meet in the middle line. Next is the brownish opaque granular area, between which and 
the neural canal is a considerable space. The alimentary canal presents a distinct 
longitudinal layer outside the circular muscular coat on which the glandular lining rests. 
Two muscular bands from the outer wall of the canal cross inferiorly, and form an arch 
for the median blood-vessel. 
In regard to the simple condition of the branchial processes this form approaches 
Marphysa, but the presence of the tentacular cirri and bristles is sufficiently 
diagnostic. 
Eunice kobiensis, n. sp. (PI. XXXVIII. figs. 12, 13 ; and PL XXa. figs. 1, 3). 
Habitat. — Dredged off Kobe, Japan, in 8 to 50 fathoms. 
The length of the example, which is incomplete posteriorly, is about 58 mm., and its 
greatest diameter about 3 '5 mm. 
The head (PI. XXXVIII. fig. 12) of this form is distinguished from that of Eunice 
norvegica by the much more deeply cleft palpi or anterior lobes. The segmentation of 
the tentacular processes is also more distinct. The tentacle reaches to the tenth or 
eleventh segment, and its constrictions are at wide intervals, especially toward the tip. 
The next pair (which are considerably shorter) have narrower segments, a feature 
still more evident in the outer short pair. The buccal segment is comparatively narrow, 
and the tips of the tentacular cirri reach considerably beyond its anterior margin. 
The dental apparatus (Figs. 37 and 38) is pale brownish, with various darker and 
lighter bands. The maxillse are moderately arched. The left great dental plate shows 
seven teeth, the right eight. The left lateral paired plate has ten teeth, the left unpaired 
eight, both sets being comparatively small. The right lateral plate has about twelve 
small teeth. There is only a single accessory plate at the end of each paired plate. 
The branchiae are represented by a minute process on the third foot, and at the tenth 
present six firm branches of moderate length, but it is a noteworthy feature that neither 
in these nor in the succeeding branchiae are the blood-vessels visible. The entire process 
is filled with coarse granular matter like the dorsal cirrus. In the twentieth foot 
(PI. XXXVIII. fig. 13) the branchiae have eight divisions, each coming off somewhat 
stiffly from the main stem, and at nearly equal distances. At the thirtieth foot there 
