REPOUT ON THE ANNELIDA. 
461 
what broad wing beneath. The shorter series show a proportionally broader and shorter, 
but finety tapered extremity. They resemble on the whole those of Lecena, the tips, 
however, being longer, and the wings as well developed as in Laphania, though they do 
not agree with Malmgren’s figure of the shorter series in Laphania boecH. They also 
differ considerably from the terminal serrated sabre of Lanassa. The bristles throughout 
are rather translucent. 
The very minute hooks (PI. XXVIIIa. fig. 3) correspond in general outline with those 
in Lanassa, but the crown, instead of having four or five teeth, has eight or nine, so that 
it is greatly elongated, the entire upper region, ind^d, being disproportionately large, a 
feature which becomes very conspicuous when the organ is contrasted with the hook of 
Lanassa nordenshibldi. The curves below the great fang also diverge, and the anterior 
inferior projection is bent upward. 
The minute portion of sandy mud in the alimentary canal shows only a few Diatoms 
and Coccoliths. 
The greyish mud so loosely attached to the hyaline lining of the tube is only slightly 
calcareous, the greater part remaining unaffected by acid. It is chiefly composed of 
minute sand-particles, muddy granules, with a considerable number of small arenaceous 
Foraminifera, but only a very few Diatoms and sponge-spicules. 
The hooks somewhat approach those of the Lecena graffii of Langerhans ^ from 
Madeira, but differ in the presence of a secondary process between the great fang and the 
anterior inferior margin. 
Lecena abyssoruin, n. sp. (PI. XXVIIIa. figs. 8, 9). 
Llabitat . — Dredged at Station 253 (in the middle of the Pacific, 1000 miles north 
of the Sandwich Islands), July 14, 1875 ; lat. 38° 9' N., long. 156° 25' W.; depth, 
3125 fathoms ; bottom temperature 35°T, surface temperature 67°'7 ; sea-bottom, red clay. 
The specimen was attached to a nodule described by Mr. Murray.^ 
The fragments of the example, when placed in a line, measure about 26 mm., with a 
diameter of 2 mm. 
The condition of the specimen prevents more than a reference to the structure of the 
bristles and hooks. The great depth from which it was dredged is probably connected 
with its injured state. The anterior dorsal (nuchal) ridge is much more bevelled from 
behind forward than in Lanassa. 
The bristles (PI. XXVIIIa. fig. 8) have rather long straight shafts with short tips, 
which taper to a fine point. The wings are well developed, and extend almost to the 
extremity. The structure thus differs from Lanassa and approaches Lecena, being a 
^ Zeitschr. f. wiss. ZooL, Bd. xl. p. 262, Taf. xv. fig. 2lcl. 
^ See Narr. Chall. Exp., vol. i. p. 758, 1885 ; and Report on Deep-Sea Deposits, pi. ix. fig. 1. 
