2Q 8 NOTOPROCTITS. 



The seventh is citron-yellow, sparsely speckled with red. The eighth is yellowish. The 

 succeeding segments are transparent. 



The typical hook (Plate CVIII, fig. 1) is minute, with a moderately long, curved shaft, 

 a marked shoulder, proportionally large great fang which makes rather less than a right 

 angle with the neck, a gular bristle which arises after an interval from the throat and only 

 splits at the tip, and four or five teeth on the rather elevated crown. The line between 

 the base of the main fang and the origin of the gular bristle is incurved, and the neck has 

 a considerable inclination backward from the shaft, so that the outline of the hook 

 somewhat resembles that given by Arwidsson for Praxillura longissima, though the crown 

 differs from that form and agrees with Lumbriclymene minor of the same author. The 

 bristles consist of stouter winged forms with tapering tips and more slender ones with 

 hair-like tips. So far as could be seen both had smooth edges in spirit-preparations. 



The tube consisted of secretion, with grains of sand and minute fragments of shells. 



A fragment of this form was described as pertaining to a Praxillura, but a more 

 complete specimen showed that it belonged to a small Lumbriclymene, probably L. minor, 

 and in this Prof. Arwidsson, who kindly examined the specimen, agrees. 



Genus CXV. — Praxillura, Verrill, 1879. 



Cephalic region with eyes. Nuchal organ small, curved. Anterior short segments 

 somewhat numerous, with the feet in the anterior part of each. Nephridia in anterior 

 segments. The posterior end is small, with a central anus. The feet have more or less 

 developed glandular belts. The anterior segments have spines, and the number of these 

 varies, the last one or two presenting a few modified hooks. Tube free, straight. 



Praxillura C. Fragment. Plate XCIX, figs. 7 and 7 a — anterior end. 



Habitat. — Dredged at Station 16 off the coast of Portugal in 994 fathoms in the 

 'Porcupine' Expedition of 1870. 



The cephalic region is shaped somewhat like that of Nicomache, bluntly conical in 

 dorsal view, and produced and tapered ventrally in profile. The mouth is in a longitudinal 

 groove ventrally. 



The body is thread-like, probably about an inch and half in length, with shorter 

 segments anteriorly and longer toward the posterior third, but the posterior end is absent. 



The bristles have rather narrow wings and tapering tips of the usual kind. The 

 typical hook (Plate CVIII, fig. 11) has a short neck and a well-marked shoulder, a main 

 fang which leaves the neck nearly at a right angle with four distinct teeth above it, and 

 traces of a fifth and sixth. No gular bristles are present. 



The tube is friable, straight, has an inner layer of translucent secretion, and an outer 

 one of Poraminifera and fine sand. 



Genus CXVI. — Notoproctus, Arwidsson, 1906. 



The nuchal organ forms a large curve. Proboscis a somewhat large, flattened sac. 

 Anterior segments short, with the feet anteriorly. Bristled segments distinct. Body 



