REPORT ON THE ANNELIDA. 
165 
muscular mass is much less than usual. The ventral longitudinal muscles are also thick, 
being almost ovoid in section. The space between their inner borders is occupied by 
the large oblique and vertical muscles, which meet in the middle line, over the nerve- 
area. The latter is somewhat elliptical, wide in the centre, and pointed at each end. 
Two small neural canals exist on each side of the middle line. The hypoderm forms a 
distinct layer externally, but the cuticle is thin. 
This species approaches the Nephthys modesta of Grube from Kerguelen.^ It appears 
to differ from the latter in the form of the head, but as Grube gives no minute account 
of the bristles some degree of doubt remains. They are evidently very closely allied. 
A large Canadian form, dredged by Mr. Whiteaves in the Gulf of St. Lawrence, presents 
in a less degree the foliaceous condition of the branchiae. 
Nephthys malmgreni, Theel C?) (PL XXVII. fig. 2). 
Nephthys malmgreni, Theel, K. Svensk. Yetensk. Akad. Hand!., Bd. xvi.. No. 3, p. 26 (Sep. 
Abd.), fig. 17, pis. i. and ii., 1879. 
Habitat . — Dredged off Setubal, on the coast of Portugal, at Station II., January 13, 
1873 ; lat. 38° lO' N., long. 9° 14' W.; depth, 470 fathoms; surface temperature, 57°'0 ; 
sea-bottom, green mud. 
A form closely approaching this species was also dredged in the “ Knight Errant ” 
at Station 8, August 17, 1880 ; lat. 60° 3' X., long. 5° 51' W., in 540 fathoms. 
A fragment of the body of a small Nephthys which was formerly procured in the 
“ Porcupine ” Expedition. All tliat need be said of it here is that the foot (PI. XXVII. 
fig. 2) consists of two somewhat pointed lobes. The upper bears dorsally an ovoid 
lamella, and the branchial process, which is large, curves outward in this example, 
and has a considerable cirrus at its base. The long bristles have the usual curvature 
and serrations. The annulated or ribbed bristles are distinguished by their great 
length and the comparatively wide bars. No bristles are present in any of the inferior 
lobes, which are bluntly pointed. The ventral cirrus is somewhat lanceolate. 
Family Phyllodocida:. 
The representatives of this family are few, but of the four, three are new to science, 
and one is remarkable in the group, in possessing the eyes largely developed, as in the 
neighbouring members of the Alciopidse, the size of these organs far surpassing anything 
hitherto known in the Phyllodocidse. Ehlers indeed characterises the family as having- 
eyes which are mere pigment-specks without lenses,^ and De Quatrefages agrees with 
1 Monatsber. cl. h. preuss. Akad. d. Wiss. Berlin, vom Aug. 1877, p. 535. ^ Die Borstenwiirmer, Bel. i. p. 138. 
