298 CHONE FILICAUDATA. 
but this has not been seen in the preparations. The posterior hooks somewhat resemble 
those of Chone Dunert, but have the five or six teeth above the main fang’ more 
distinct. 
SYNONYMS. 
1910. Chone infundibuliformis, Southern. Proc. Roy. Irish Acad., xxvii, p. 215. 
1914. ,, jilicaudata, idem. Ibid., vol. xxxi, No. 47, p. 141, pls. xiv and xv, figs. 32 a—1. 
OIG, ie McIntosh. Ann. Nat. Hist., ser. 8, vol. xvi, p. 45. 
Habitat.—Inishlyre Harbour, Ballynakill Harbour, Dingle Bay and Dublin Bay 
(Southern). 
The cephale collar is somewhat narrower and less prominent than in C. Fawveli, is 
infolded dorsally, entire on the ventral aspect, and does not slope obliquely as in C. Dunerv. 
The lip-membrane terminates on the ventral side in a bifid process. 
The branchiz are eight or nine pairs, besides one ventral filament devoid of pinne 
attached to the branchial membrane, and an inner ring of similar filaments of varying 
number and length. The ordinary filaments are connected nearly to the tip by a 
membrane, and the terminal naked processes are subulate. The branchie are fully half — 
the total length of the animal. 
The body is short, stout, 11 mm. long, of about twenty-eight setigerous biannulate seg- 
ments, eight being anterior and twenty posterior. It tapers a little toward the tail, which 
ends in an anus ventrally, with a filiform cirrus dorsally. The anterior region is marked 
by a dorsal groove, which passes at the end of the region to the mid-ventral surface to be 
continued to the tail. Numerous glands occur on the ventral surface. The body is whitish 
in preservation. 
The first setigerous segment is narrow and bears long winged bristles in a row with others 
in which the wings are very narrow. The typical anterior bristles (Plate CX XXI, figs. 1 and 
1’) have long slender shafts with narrow striated wings; beneath are slightly spatulate 
forms, which taper gradually to a point, and thus differ from those of C. Dunert and C. Fauvelt. 
Slender wingless forms occur at the base of the latter. The posterior bristles differ chiefly 
in the great elongation of the finely tapered tips, which have a characteristic bend at the 
origin of the wing. 
The anterior hooks (Plate CX XXI, fig. 1a) have long shghtly curved shafts which dilate 
upward till near the shoulder. The main fang comes off at more than a right angle to the 
neck, and three or four teeth occur above it; whilst Mr. Southern observed a delicate wing 
at the back of the crown, as in the Spionids. 
The posterior hooks (Plate CXXXI, fig. 16) are avicular, the posterior outline having 
a slight incurvation, the basal margin sloping downward and forward, and then upward to 
the prow. The main fang has a small gulf beneath it, and there are six or seven distinct 
teeth above it, so that the crown is high. These hooks toward the tip of the tail show a 
diminishing series in each row. 
This form differs from Chone Duneri, Malmgren, which it approaches in the presence of a 
bifid process of the lip-membrane, in the form of the posterior hooks, which have a higher 
crown and more numerous teeth above the great fang in lateral view. It also has a conical 
