482 SCOLECOLEPIS LAMELLATA. 
lucent bristles with a well-marked curve at the commencement of the tip. If wings are 
present, they are very narrow. The second foot bears dorsally a small branchia curved 
inward, the dorsal lamella beg fused to it, and ending inferiorly in a truncate edge. A 
tuft of finely tapered translucent bristles spreads like a fan upward and outward. The 
upper bristles of the tuft are longer and more delicately tapered, and the wings in these 
are less distinct than in the shorter and thicker forms at the lower edge. The inferior division 
has a bluntly rounded lamella and a shorter tuft of bristles, with traces of wings. At the 
tenth foot (Plate CX X XVI, fig. 7) the branchia is larger, forming a broad, flat curved process, 
the soldered lamella of the superior lobe ending inferiorly in an edge which projects less 
than the upper margin of the ventral lamella. The dorsal tuft of bristles has the same 
structure as in the second, only they are in two rows, are longer and stronger, and the tips 
less elongated. The lamella of the mnferior division has increased im depth, and the bristles 
are proportionally longer and still stouter than the dorsal. Both tufts have a distal curve. 
Southern describes a group of three slender striated setze on the lower margin of the ventral 
bundle. 
Hooks appear in the ventral division of the fifteenth or sixteenth foot. At the twentieth 
foot the branchia retains a similar shape and is still large, with the dorsal lamella on its outer 
edge. The bristles are similar to those in front. Ventrally the lamella has much increased 
in depth and 1s separated only by a short gap from the dorsal, where its breadth is greatest, 
for 1¢ diminishes ventrally. rom its lower edge fully half its border is occupied by hooks, 
which are closely arranged inferiorly, but have more space superiorly. 
The shaft of the hook (Plate CX XXIII, fig. 19) dilates from the base upward to the 
bold forward curvature, then it slightly diminishes to the neck, from which the propor- 
tionally large main fang comes off at a little more than a right angle. A single spike (in 
lateral view) occurs on the crown. Distinct wings guard the tip of the hook, which is 
thus in reality hooded. The lamellee of the feet are most prominent in the posterior part 
of the body, and thus differ from those of N. longirostris, and the latter lives in clear sand, 
whereas NV. tridentata frequents laminarian roots (Southern). 
SCOLECOLEPIS LAMELLATA, McIntosh. Plate XCVI, figs. 8 and 8a—tenth and fiftieth feet. 
In the ‘Annals of Natural History’! a form from the “ Porcupime” Expedition of 1869 
was alluded to under the title of Scolecolepis (I.). This has now been definitely termed 
S. lamellata, McIntosh. 
Specific Characters —Head with an even transverse margin in front, a short, blunt 
tentacle at each angle, and from the centre a short, elevated region proceeds backward, 
to end in a small process, which is pomted posteriorly like an adherent tentacle. Minute 
eyes seem to be present on each side of the latter, but the condition of the specimen renders 
accurate determination uncertain. The whole region is short, and the proboscis is thrust 
out as a short cylinder with a crenate margin. Body fragmentary, flattened, slightly and 
abruptly tapered anteriorly, and with a median band ventrally. The segments are narrow 
and numerous. The first foot carries a subulate branchia and a large, lanceolate lamella 
* Ser. 8, vol 11, February, 1909; p. 176. 
