480 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Terebellides, M. Bars. 
Terehellides stroemi, M. Bars, var. (PL XXIXa. figs. 3—6). 
Terebellides stroemi, Sars, Beskrivelser og Jagttagelser, <kc., p. 48, Tab. xiii. fig. 31, 1835. 
Habitat. — Dredged at Btatioii 47 (off the American coast, near New York), May 7, 
1873; lat. 41° 14' N., long. 65° 45' W.; depth, 1340 fathoms; surface temperature, 
42°'0 ; sea-bottom, blue mud. 
An elongated example, measuriug about 70 mm., and scarcely reaching 3 mm. in 
diameter in front at its widest part. 
It agrees with the ordinary Terebellides stroemi, M. Bars, in general ap23earance, the 
only difference being the great length of the posterior region (behind the bristles), no 
less than fifty-two uncinigerous processes occurring on each side. The bristles are 
perhaps a little shorter and less attenuate than in a typical Terebellides stroemi from 
Norway. The anterior hooks (PI. XXIXa. fig. 3) present a more distinct enlargement 
of the head, and a more decided constriction of the neck, features at once apparent on 
contrasting the former figure with the drawing of a hook from a large Norwegian example 
(PL XXIXa. fig. 5). The posterior hooks, again (PL XXIXa. fig. 4), differ in having 
the posterior curve less convex, and the anterior inferior angle less produced than in the 
Norwegian type (PL XXIXa. fig. 6). It is of course doubtful whether these slight 
differences indicate more than mere variation, but they are worthy of careful attention. 
The greyish sand in the alimentary canal presents only a few sponge-sj^icules, one 
or two Diatoms, and Coccoliths. 
The structure of the l)ody-wall agrees with that in the British form. It differs from 
the type of the previous genera in having the nerve-cords within the circular coat. 
The number of segments is an uncertain feature, though the proportion of the 
bristled to the others is of course more reliable. This species ranges from the European 
to the American shores. 
Terebellides stroemi, M. Bars, var. Kerimelensis (PL XXIXa. fiars. 7, 8 ; PL 
XXXVIIIa. fig. 4). 
Habitat. — Dredged at Btation 149g (off London River, Kerguelen), January 29, 
1874 ; lat. 48° 50' B., long. 69° 18' E.; depth, 110 fathoms ; surface temperature, 40°‘2 ; 
sea-bottom, volcanic mud. 
The specimens are less than the preceding, the longest measuring 38 mm., with an 
anterior diameter of 3 mm. 
There is little external difference between these and Norwegian forms, except. 
