Gatty Marine Laboratory, St. Andrews. 227 
terminal blade is translucent, tapers to an extremely fine 
point, and the serrations on the edge are minute. The entire 
bristle is perhaps one of the most delicate in the group. 
The ventral lamella is ovoid and bluntly rounded in front, 
more pointed posteriorly. It projects considerably beyond 
the setigerous region. 
The Eteone limicola of Verrill*, is described as having 
‘lateral appendages small on the anterior segments, becom- 
ing much more prominent farther back; anterior branchie 
very small, ovate, sessile; those farther back much longer, 
and narrow ovate”; but in the Canadian form the dorsal 
lamellee extend prominently outward and upward, even so far 
forward as the tenth foot. The eyes also appear to differ, 
none being visible in the present species. The form 
approaches Webster and Benedict’s E. cinerea t, though the 
ventral lamella in the Canadian species extends considerably 
beyond the setigerous region, whereas in the American author’s 
figure it falls short of it. 
5. On certain Hesionide from the * Porcupine’ 
Expedition of 1870. 
Tyrrhena atlantica, Roule ¢. 
Habitat. Several specimens were dredged in the ‘ Porcupine’ 
expedition of 1870 at Station 9, on the Channel Slope, 
lat. 48° 6! N., long. 9° 18’ W., in 539 fathoms, on a bottom 
of grey mud. Bottom temperature 48°-0 Fahr., surface 
temperature 64°:0. 
Head more or less quadrate, with the long diameter antero- 
posterior, and generally with a median depression and a 
somewhat cordate posterior border, so that the eyes occur on 
an elevated ridge on each side. ‘lhe anterior pair of eyes are 
wide apart, large, rounded, and with a cuticular lens in the 
centre, the darkest part of the pigment-ring, in spirit, being 
the inner and posterior border. ‘The posterior pair are 
rounded or oblique in the preparations. ‘The two pairs lie 
in the middle of the head. From the outer and inferior angle 
of the head on each side the palpi project forward and 
downward, the segment at the tip being proportionally short, 
and, in his species, Claparéde observes that it can be partly 
invaginated. ‘The organ is of considerable thickness at the 
* Invert. Vineyard Sound, &c., Rep. U.S. Comm. Fish & Fisheries, 
1873, p. 588. 
+ Annelids of Provincetown, Rep. U.S. Comm. Fish & Fisheries. 
{ “Campagne du ‘Caudan,’” Ann. de Université de Lyon, Aotit-Sept., 
1895, p, 455, pls. xxi., xxiy., xxv. figs. 9, 10, 24, 28, 29 (1896). 
