216 
THE VOYAGE OF H.M.S. CHALLENGER. 
ruhida, from the Philippines/ is likewise an allied species, from which it is distinguished 
by the absence of j)aragnathi III. and other points. 
Nereis [Lycoris V) jielagica, Linnseus. 
Habitat . — Dredged at Station 49 (south of Halifax, Nova Scotia), May 20, 1873 ; 
lat. 43° 3' N., long. 63° 39' W. ; depth, 85 fathoms ; bottom temperature 35°‘0, surface 
temperature 40°‘5 ; sea-bottom, gravel and stones. The specimens procured at this 
Station resembled those from the Gulf of St. Lawrence, Canada. 
A single example of average size, measuring (without the absent tail) about 85 mm. 
An albino-patch occurs between and behind the eyes. The chief difference between 
this and a form of the same size from St. Andrews is the decided diminution of the 
superior lobe in the specimen from the Challenger, a feature in which the latter agrees 
with the Canadian examples. Considerable latitude ajjjDarently recpires to be given to 
this species. Thus in the Canadian and other varieties the pit for the dorsal cirrus is 
rendered deeper by the increase in the shoulder behind it. Some of these varieties are 
probably sexual. 
The intestine of the specimen is loaded with muddy sand, mixed with organic debris 
and sponge-spicules. 
This species possesses a very wide geographical range, not only frequenting the 
northern shores of Europe and America, but passing considerably southward to the 
Canaries and West Indies. It also extends eastward to Japan. 
Nereis (Perinereis) melanocephala, n. sp. (PI. XXXIV. figs. 14, 15, 16, 17 ; PL XVIa, 
figs. 8, 9). 
Habitat. — A single example found between tide-marks at Bermuda, June 1873. 
The body somewhat resembles a very dark Nereis marionii. Head longer than broad ; 
tentacles little more than half the length of the head ; eyes of moderate size, each with 
a small lens. Palpi large and dark, tips pale. Tentacular cirri short, the longest just 
reaching the fourth segment. Paragnathi — I. form a triangular area of somewhat large 
flattened teeth ; II. rhomboidal patches of teeth of the same size ; HI. larger area than 
I. ; IV. similar to II. ; V. a single large black tooth ; VI. continuous broad horny 
bands ; VII. and VIII. broad belt of large isolated teeth. Maxillae blackish-brown, 
with six or seven teeth below the fang. First body-segment twice the breadth of the 
succeeding. Lobes of the feet, blunt in front, but posteriorly the dorsal is greatly enlarged 
1 Annelidenfauna d. Philippinen, p. 70. 
