flEPOET ON THE ANNELIDA. 
345 
The body- wall of this example shows decided differences from the typical Glycera 
capitata, and indeed it is evidently a distinct species. Thus the nerve-area (PI. XXXVa. 
fig. 3), instead of reaching the inner border of the ventral longitudinal muscle, has a 
thick layer of fibres on its upper (inner) border. Moreover, in the latter the cords 
are more distinct. No neural canal is visible. The proboscis is typical in structure, 
but the papillae (PI. XXXVa. fig. 4) are considerably longer and more slender than in 
Glycera capitata. 
Glycera amboinensis, n. sp. (PI. XLII. figs. 6, 7). 
Habitat — Dredged in 15 fathoms, near Amboina. 
A small specimen, about 33 mm. long and 3 mm. in breadth. It much resembles 
the common British form, which is closely allied to Grube’s Glycera tesselata. 
The general aspect and the snout very much resemble the latter, and the same may 
be said of the extruded proboscis, though the conical papillae are larger than in the 
British species, and the bases of the teeth diverge. 
The structure of the feet anteriorly is also similar, and the dorsal cirrus has nearly 
the same position. The feet, however, are imperfectly preserved, so that deductions on 
this head must be correspondingly guarded. At the tenth foot there are two elongate 
and somewhat lanceolate upper lobes, the superior having a dorsal curvature towards 
the tip. Both are acutely pointed, as is also the shorter ventral lobe. The bristles 
are decidedly longer than in the British form, and the tips of the inferior series more 
slender and arcuate. Moreover, in the British species the posterior feet differ consider- 
ably and possess branchise, whereas in this they apjDear to be very similar to the 
anterior. . In both the serratures on the edge of the dorsal and the terminal piece of 
the ventral bristles are more distinct in the posterior feet. The comparative length 
of the bristles remains the same, that is, they are much longer in the present 
species. 
In transverse section the body-wall is so attenuated by distension of the pervisceral 
cavity tiiat the muscular layers are imperfectly exhibited. The nerve-area is wide 
and bilobed, and the disposition of the external circular coat diverges from that in 
Glycera capitata. It seems to be less developed. 
The Glycera decip)iens of Marenzeller from Southern Japan has a foot similar to the 
foregoing, but it bears a large branchial process, and is, on the wdiole, somewhat shorter 
and deeper, and the ventral cirrus differs in outline, so that even in a form devoid 
of Ijranchise (an occasional occurrence) the distinction would be’ evident. It also 
approaches Glycera tesselata, Grube. The latter author’s Glycera rutilans, from Ceylon, 
seems to be an allied form, but the condition of the specimen in the British Museum 
(ZOOL. CHALL. EXP. — PART XXXIV. 1885.) LI 44 
