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broadly rounded, the median part of the posterior margin has a broad and very deep incision; 
the median part of the plate, outside and especially in front of the genital apertures, consists 
of soft membrane. The genital apertures are rather large, strongly curved and situated 
pretty close together. The caudal stylets are very small and situated near each other on 
the soft membranous part on a line with the posterior margin of the chitinous plate. On 
each side of this plate, at a considerable distance from the margin, runs a very long, curved 
line of very long, outward turning hairs, and from the part between the genital apertures 
towards the caudal stylets run four stripes, anteriorly very narrow, posteriorly broader, 
of extremely short, fine hairs. 
MALE. The best preserved specimen has become crooked through pressure (fig. 2f); 
it is ‘21mm. in length, consequently of small size compared with the female (fig. 2b: fig. 2a) 
and has a broad shape similar to that of the male of S. Argisse (represented in pl. LV, 
fig. 3¢—3h), whereas in hair-covering and in the structure of the trunk-legs etc. it bears 
great resemblance to 8. Metope (pl. V, fig. 1f—1g). The head seems to be somewhat larger 
than the trunk. The front is somewhat produced as in S. Argisse, but the margin scarcely 
concave in front of the antennule. Antennule, antenne, mouth, maxillule and mavxille 
essentially as in S. Metope. The basal joint of the maxillipeds has a short, broad, conical 
process on its inner surface, besides several groups or stripes of moderately long hairs; the 
last joint is digitated, at the apex ending in about four points. The three pairs of pro- 
cesses of the sub-median skeleton are somewhat like those of S. Metope, but the first pair 
are longer and more pointed, the second pair a little shorter and more or less diverging. 
The lateral margin of the head is fringed with somewhat longer hairs than in S. Metope, 
and from its posterior angle a somewhat broader stripe of longer, and dorsally very long 
hairs runs almost vertically upward across the side and the back; behind this stripe is a 
moderately long, naked, dorsal transverse area, whereas the remainder of the trunk is covered 
with hairs as in S. Metope, however, the hairs are proportionally longer and coarser. The 
dorsal and lateral parts of the head have hollow spaces beneath the skin. The first pair of 
trunk-legs nearly as in S. Metope@; the most important difference is that the terminal 
seta of the inner branch is considerably shorter, and shorter than the distance between 
the base of the leg and the end of the outer branch. The second pair of legs are some- 
what larger than in S. Mefope, but the shape and sete are much the same as in this 
species. The caudal stylets end in a single seta which is scarcely as long as in the pre- 
ceding species. 
OVISACS. They are comparatively rather small (fig. 2¢), sub-globular or oval, 
differmg rather slightly in size; one of the largest which is ‘63 mm. in length and 52 mm. 
in breadth, is represented. The eggs are proportionally rather small and pretty numerous. 
LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. The marsupium of Paramphithoé Boeckii H. J. H. trom West-Green- 
land, off Godthaab, »deep water« {probably 40—60 fathoms], on Sertularia, C. Holboll. In 
