REPOET ON THE ANNELIDA. 
515 
slender, with much elongated tapering tips bordered by a somewhat narrow wing. The 
shorter series in each is composed of proportionally stouter bristles with a slightly broader 
wing. Towards the posterior end each segment possesses about three very long, slender 
bristles, with slightly curved, simple, tapering tips. 
The anterior hooks (PI. XXXIa. fig. 22) much resemble those of Protula. The small 
teeth above the great fang are, however, less numerous, apparently being proportionally 
larger. The dorsal curve, moreover, is not evenly outlined. The sinus below the great 
fang is somew’hat wide. The posterior hooks do not materially differ. 
In the digestive canal was a little greyish mud showing Diatoms, Coccoliths and Cocco- 
spheres, minute Glohigerince and other Foraminifera, with a few Eadiolarians. 
The specimen occurred in a smooth white tube, not unlike that of Hydroides, on 
Pomatocerus strigiceps. 
The Apomatus glohifer, Theel,^ from Nova Zembla, differs in the absence of the 
lateral expansions on the radioles, and in the smoothness of the tube. The hooks in the 
northern form are more finely toothed. Langerhans ^ states that this form is identical 
with Marion and Bobretzky’s Apomatus ampidliferus. Marenzeller’s Japanese Apomatus 
enosimce is peculiar in having the minute teeth prolonged on the base of the great fang. 
This is exceptional, and may be due to the engraver. The teeth in the typical Apomatus 
ampulliferus of Philippi, as figured by Marion and Bobretzky,^ and that of their own 
new species {Apomatus similis), nearly correspond with those of the Challenger form. 
Serpula, Linnaeus. 
Serpida somhreriana, n. sp. (PI. XXXIa. figs. 14, 15). 
Habitat. — Dredged off Sombrero and St. Thomas, in 470 and 390 fathoms. 
A small specimen, measuring about 12 mm. in length and 1 mm. in diameter 
immediately behind the thoracic region. It had ajaparently been dried, and can only be 
imperfectly described. 
A bare filament seems to be present at the tip of the radioles of the branchiae, which 
present the ordinary characters. 
A very interesting feature is the peculiar arrangement of the cephalic collar, which 
forms three conspicuous lobes. Two of these are dorsal, forming on each side of the 
middle line a large triangular lamella, which reaches about as far backward as the 
penultimate bristle-tuft of the thorax. A deep fissure on each side separates the fore- 
going region from the great triangular ventral flap, the apex of which extends to a 
^ K. Svensk. Vetensk. Akad. HandL, Bel. xvi., No. 3, p. 66, pi. iv. figs. 63-65, 1879. 
Zeitschr. f. wiss. Zool., Bd. xl. p. 277, 1884. 
3 Ann. d. Sci. Nat., ser. 6, t. ii. pi. xii. fig. 24e, 1875. 
