302 JASMINEIRA ELEGANS. 
which has an acute tip with a conical papilla above the anus. Anterior region of nine 
segments, the posterior of twenty-five to thirty-one. The ventral groove cuts through 
the right edge of the eighth ventral scute (glandular area) in its progress to the dorsum. 
Two small scutes begin the series on the second bristled segment, and the next seven 
rather increase in size from before backward. The scutes of the posterior region are in pairs, 
separated by the broad ventral groove. Colour pale yellow or pale brownish throughout, 
the branchie being slightly deeper in tint when contracted. Two large dark patches like 
eyes occur on each side beneath the collar. Dorsally the alimentary canal appears as 
a moniliform pale orange band with dark masses at the sides. It is pale posteriorly. At the 
margin of the third and fourth segments the body is encircled by a fine greyish refringent 
line. , 
Anterior region with nine bristle-tufts, the first near the posterior border of the fused 
buccal and first segments. It consists of capillary bristles with curved and winged tips. The 
other tufts of the region have in addition bristles with a spatulate tip and a central process. 
Bristles of the posterior region of one kind, viz., capillary with tapering, winged tips, which, 
however, have a tendency to increase in length even at the anterior part of the region, but 
toward the tail have remarkably long, hair-like tips. Anteriorly the bristles are dorsal, 
posteriorly ventral to the hooks. Anterior long crotchets are in a single row, each curved 
like a bow, the striated shaft dilating gradually upward from the slender base to the 
shoulder; then follows a somewhat narrower smooth neck, from which the main fang comes 
off nearly at a right angle, the crown above having numerous small teeth. The hooks in 
each row number from nine to twenty. Posterior hooks §-shaped, the base smoothly 
curved anteriorly, convex inferiorly and turned upward posteriorly. Neck slightly con- 
stricted, the main fang, which is long and sharp, coming off at less than a right angle 
and having numerous small teeth on the crown above. Probably tubicolar amongst oysters. 
SYNONYMS. 
1894, Jasmineira elegans, De St. Joseph. Ann. Se. nat., 7° sév., t. xvii, p. 316, pl. xii, figs. 337—346. 
1900. 5 - Newbigin. Communic. Millport Stat., i, p. 1. 
1902. i ey Fauvel. Comp. Rend. Acad. Sc. Paris, December 29th, 1902. 
1909. “ - idem. Ann. Se. nat., 9° sér., t. x, p. 210. 
1910. i 5 Southern. Proc. Roy. Irish Acad., vol. xxviii, p. 242. 
% 55 F Elwes. Journ. M. B. A., vol. ix, p. 65. 
1914. 7 os Southern. Proc. Roy. Irish Acad., vol. xxxi, No. 47, p. 140. 
1915. 53 . Allen. Journ. M. B. A., vol. x, p. 643. 
pe ys i Southern. Irish Se. Invest., No. 3, p. 49. 
1916. " Pe McIntosh. Ann. Nat. Hist., ser. 8, vol. xvu, p. 45. 
1917. 3 f Rioja. Anél. Poliq. Cantab., p. 71. 
Habitat—Clew Bay, two miles east of Bailey Light, Dublin Bay, and West coast of 
Ireland, 13—164 fathoms (Southern); Millport, Cumbrae (Newbigin); Torquay (Elwes); Asia 
Shore, Plymouth (Allen). Elsewhere it is found off Norway; dredged amongst oyster-shells 
and probably tubicolar at Dinard, France (De St. Joseph); shores of Cantabria (Rioja) ; 
St. Vaast-la-Hougue (Fauvel). 
The cephalic lobe, when the branchie are removed, projects as a mushroom-shaped 
basal region—that 1s, it is constricted proximally and dilated distally, with a median cleft, 
