REPOET ON THE ANNELIDA. 
487 
lined with a delicate membrane which projects from 6 to 10 mm., is probably the last 
mentioned species (Sabella saxicava)} 
Sabella zebuensis, n. sp. (PI. LII. fig. 2 ; PI. XXIXa. figs. 20^22). 
Habitat. — Dredged at Station 209 (off Zebu, one of the Philippines), January 22, 
1875; lat. 10° 14' N., long. 123° 54' E.; depth, 95 fathoms; bottom temperature 
71°‘0, surface temperature 81°'0 ; sea-bottom, blue mud. 
A somewhat flattened species, the longer fragment measuring about 85 mm., of 
which, however, about 40 mm. belong to the branchiae. The diameter anteriorly is 
about 4 ‘5 mm. 
The body is rounded dorsally and flattened ventrally, and, with the exception of a 
minute blackish dot a little above each bristle-tuft in the posterior region, is devoid 
of pigment. Only a slightly elevated broad ridge occurs on each side of the dorso- 
cephalic groove, the collar ceasing at each side a little within the flrst bristle- 
tuft. It proceeds ventrally from the latter point as a prominent lamella, and ends 
on each side of the ventral Assure in a conspicuous lappet, thin at the extremity, 
but massive at the base. The anterior part of the dorsum presents a peculiarly 
streaked appearance, apparently from the perivisceral corpuscles shining through 
the translucent integuments, some of these bodies or aggregations of them assuming 
a stellate aspect.' Ventrally the median line [sulcus abdominalis, M. Sars) passes 
forward, in one to the posterior part of the second scute, in the other to the scute 
behind the anterior region. The flrst scute has an excavation anteriorly on each side 
of the median line. 
The branchiae are remarkably long, and amount to twenty-two or twenty -three on 
each side. They are pale in the preparation, with the exception of a deep brown 
band of considerable breadth at each side dorsally below the basal web. It forms 
thus a conspicuous mark. The pinnae are very slender, so that the branchiae are 
remarkably soft and delicate, spreading out in the spirit somewhat like moist cotton. 
Toward the tip of each radiole the pinnae diminish, flrst to short blunt papillae, and 
then to mere crenations of the inner edge. The radioles terminate in long slender filiform 
extremities. 
The two tentacles are comparatively short, and have the form of tapering 
grooved organs. 
On each side of the mouth, and just above the median ventral flaps, is a sac-like 
diverticulum, the cavity of which communicates with the mouth. It is therefore a 
labial pouch. 
1 Compare witli Ann. and Mag. Nat. Hist., ser. 4, vol. ii. pi. xx. figs. 5-8, 1868. 
