186 PROCLEA G-EAFFI.
considerable distance behind these. . Sixteen setigerons processes with bristles. Second,
third and fourth segments have side-lobes, the second and third best developed.
First bristle-tuft is on the fourth segment. The anterior bristles in two series, the
longer with straight shafts, which at. the commencement of the wings have a slight
curvature. The shorter series show translucent, flattened tips, not differentiated into
wings. The succeeding bristles have only the flattened, translucent tapering tip—sometimes
with a longitudinal streak. In the last eight the shorter tufts show pectinate
tips. The outline of the hook approaches that of Lesena, the crown being large, with
about seven distinct teeth above the main fang. The prow is minute and conical, and
a similar small conical process exists posteriorly with a deep notch above it. The
posterior border is convex. All the rows of hooks behind the bristles are single.
Nephridia in the third, sixth, seventh and eighth segments.
Synonyms.
1884. Lexnn Grafiii, Langerhans. Zeitschr. f. w. Zool., Bd. xl, p. 262, Taf. xv, fig. 21.
1894. Proclea „ . De St. Joseph. Ann. Sc. nat., 7e ser., t.'xvii, p. 180.
1899. Solowetia Malmgreni, Ssolowiew. Ann. Mus. Acad. Imp. St. Petersburg, t> iv, p. 195.
1912. „ „ Wollebaek. Skrift. Selsk. Krisfc., Bd, ii, p. 74.
1914. Proclea Graffi, Southern. Proc. Roy. Irish. Acad., vol. xxxi, No. 47, p. 120.
1917. ,, >> Hessle. Zool. Bidr. Uppsala, Bd. v, p. 199, Text-fig. 53.
HitMto^-Dredged in Clew Bay m |||||f |; fathoms on a sandy bottom (Southern).
Abroad it has been met with in the White Sea and Franz Joseph Land (Ssolowiew) ;
shores of France (De St. Joseph); Norway (WollebaskfrSwedish West Coast (Malm);
Finmark (Hessle).
The cephalic region presents ventrally two frilled lamellas—one on each side of the
mouth instead of the usual continuous lamella, though a rupture of the base may have
taken place. Above this is the flattened surface from which the grooved tentacles arise.
The buccal segment has behind the mouth a small semicircular lamella split in the
middle.
The body is about an inch in length, enlarged anteriorly and tapering to the posterior
end, which is imperfect, and has a characteristic Terebellid aspect. It is rounded dorsally,
slightly flattened ventrally, on which surface is a median groove. Anteriorly the ventral
surface has about ten scutes, the first four being, however, very narrow, almost
linear. To the exterior of these are the rows of hooks, which are of considerable
breadth, and at the dorsal edge are the sixteen setigerous processes with the bristles.
Smaller scutes occur in the median groove a considerable distance backward. Behind
the anterior region the uncinigerous lamellas and the setigerous processes are separated
by considerable intervals, the former continuing as prominent papillae to the posterior
end (fragmentary).
The first bristle-tuft commences on the fourth segment (Southern). The pale golden
anterior bristles (first eight) consist of a longer series with nearly cylindrical straight
shafts, which at the commencement of the wings have a slight curvature and taper to a
fine, hair-like tip (Plate CXXVI, figs. 10 and 10'). . A shorter series projecting little
beyond the surface shows translucent, flattened and slightly curved tips, which are not
differentiated into wings, but taper to a delicate tip. The setigerous processes bearing
them are, in those best developed, lamellar, so that they form a broad brush.
The succeeding bristles are in smaller pairs, and consist of a series having long
straight shafts which dilate into a flattened translucent blade, slightly convex dorsally
and tapered to a delicate tip (Plate CXXVI, fig. 10 a). The translucent blade has fine
striae and serrations. The tips of shorter forms project from the surface. The flattened
tips of the posterior series appear to be modifications of the shorter series in front, the
shaft ceasing at their bases, and only a longitudinal streak occupying the centre of the
blade. -
The anterior hooks approach those of Lesena, the crowns being large and the bases
small. Each (Plate CXXVI, fig. 10 b) shows an acute main fang of moderate size, above
which the high crown rises, its anterior edge having about seven distinct teeth. Below
the main fang is a small smooth gulf, with a minute conical prow below, the inferior
border being convex and rising to a similar small conical process posteriorly, above which
is a deep notch, and then the convex posterior border goes to the crown. The posterior
hooks do not differ in structure, though less in size, and therein they diverge from many
ordinary Terebellids.
Reproduction.—A mature female occurred in August (Southern).
Sub-Family II.—Polycieludba.
The second sub-family of Malmgren’s Terebellidæ is the Polycirridea, which he
characterises as having an entire and large cephalic lobe, rarely tripartite, the grooved
tentacles arising from its upper surface. The bristles are not winged, and, as a rule,
occur only anteriorly. Hooks elongate, sublinear or absent. No branchiae or eyes. No
visible blood-vessels. The genera are thus characterised by Malmgren :
No hooks. Bristles in six segments ... . . . • • • Lysilla, Mgrn.
f in thirteen segments . . Ereutho, Mgrn.
Avicular hooks. Fascicles of capillary | in nineteen to twenty-two
bristles..............................................1 segments . . . . Leucariste, Mgrn.
I in forty or more segments . Poly cirrus, Grube.
Acicular elongate hooks. Fascicles of bristles in ten segments . . Amæa, Mgrn.
Formerly the group was included under the Aphlebina, De Quatrefages, Grube,
-Claparède; Polycirrus, Grube, Schmarda; Apney/mea and Térébellides abrauches, De
Quatrefages ; Ereutho, Malmgren ; ‘ Leucariste, Malmgren ; Gyaxares, Kinberg, and
Dejoces, Kinberg.
• Genus CLVI^-Polycikrus, Grube, 1851.
Cephalic lobe with a slight dorsal collar, which in extension forms a frilled margin
to the funnel-shaped oral region; when folded ventrally it has two lateral flaps with
a median furrow. From the surface of this cephalic plate a dense series of grooved and
often clavate tentacles springs. Body of the typical Terebellid outline, often coiled in