488 CIRRATULUS McINTOSHI. 
FaMILy CIRRATULIDZ. 
Crrratutus McInrosut, Southern, 1914. Plate CX XX, figs. 11 and 1la—tail and bristles. 
Specific Characters.—Head a small blunt cone, sometimes constricted posteriorly, and 
in extrusion of the proboscis it projects upward and forward, or in complete extrusion 
upward. Body probably between 1 and 2 inches long, flattened anteriorly, and somewhat 
rounded posteriorly. It is tapered rather abruptly anteriorly, but posteriorly only shght 
diminution occurs, the body terminating in a pouting, button-shaped vent, produced ventrally 
into a process with a median fissure and a fillet on each side. The ventral surface is flattened, 
sometimes with a median ridge and two lateral elevations. The buccal and two achetous 
segments follow the head. Long, slender branchiz arise from the dorsal edge of fully twenty 
of the anterior feet. Anterior segments narrow, posteriorly they are broader, and the number 
may be seventy to a hundred. Foot (typical) with a dorsal and a ventral setigerous process, 
each bearing a tuft of capillary bristles, the tips being slightly flattened at the somewhat 
narrow base, and tapering to hair-like extremities, the dorsal one the longer. Well 
developed ova in July. i 
SYNONYMS. 
1911. Cirratulus norvegicus ? McIntosh. Ann. Nat. Hist., ser. 8, vol. vu, p. 171, pl. vu, figs. 12 
and 12 a. 
1914. a Macintoshi, Southern. Proc. Roy. Irish. Acad., vol. xxxi, No. 47, p. 110. 
1922. = _ McIntosh. Ann. Nat. Hist., ser. 9, vol. 1x, p. 28. 
Habitat—Dredged in Inishlyre Harbour, Killary Harbour, Bofin Harbour, and Clew 
Bay (Southern). 
Distribution.—Dredged in 30—100 fathoms off Drobak, Christiania Fjord (A. M. N.). 
The head has the form of a small, blunt cone, sometimes contracted posteriorly, and 
when the button-shaped proboscis is extruded, as in the majority, it projects upward and 
forward, or, in complete extrusion, upward. The gaping mouth has a considerable amount 
of dark pigment. 
The body is probably between 1 and 2 inches in length, flattened anteriorly, and some- 
what rounded posteriorly. ‘ It is tapered rather abruptly anteriorly, but does not appear 
to be much tapered posteriorly, only a slight diminution taking place in the preparation ; 
but such may be an incomplete specimen. It terminates posteriorly in a pouting button- 
shaped vent, which is produced ventrally into a process with a median fissure and a fillet 
on each side of it (Plate CX XX, fig. 11). The ventral surface is flattened, sometimes with 
a median ridge and two lateral elevations, though in a few neither is visible. The buccal 
and two achetous segments follow the head, and in one example each has a dorso-lateral 
frill—it may be from imperfect preservation. Hvery example presents two short lappets 
(or, 1t may be, the bases of tentacles) interposed between the converging lateral lines of the 
feet nearly opposite the first bristle-bundles. A series of long, slender branchiz project 
from the dorsal edge of more than twenty of the anterior feet, and traces appeared in some 
considerably behind these. The anterior segments are closely arranged, but posteriorly 
