KEPOKT ON THE ANNELIDA. 
371 
Station 149 b (off Eoyal Soimcl), January 17, 1874; lat. 49° 28' S., long. 70° 30' E.; 
depth, 25 fathoms; surface temperature, 40°'5 ; sea-bottom, volcanic mud. 
The skin is coated with minute grains of sand. 
The frontal bristles (PI. XXIIIa. fig. 7) have, on the whole, somewhat narrow bars, 
except at the tip, and are remarkable for the great profusion of stalked parasitic 
Infusoria which embellish them. So dense is this infusorial coating that the bristles 
form a matted mass in which Nematoids and other forms lodge. The condition of 
such bristles resembles the stem of a zoophyte clothed with Clytia johnstoni and other 
Campanularians. The bell-shaped Infusorians are in various phases, that on the 
right of the figure (with the parasitic vase on its stalk) has ruptured, and only the 
nucleus and a little granular matter remain. 
The dorsal bristles are pale, comparatively small and slender, and marked by closely 
arranged transverse striae. 
The ventral “ hooks ” are nearly straight or slightly curved dull reddish-brown 
structures,, very closely marked with transverse striae (PI. XXIIIa. fig. 8), which 
superiorly often form groups, with an interval between them. The ventral margin of 
the tip is often slightly abraded. 
The intestines of those from Betsy Cove are loaded with ooze, containing large 
circular Diatoms, numerous and varied sponge-spicules, and other structures. 
The description given by Grube in the account of the Annelids of the German 
exploring ship “ Gazelle ” seems to agree with the foregoing. In his remarks on 
the anatomy of this species Studer ^ speaks of the splitting of the circular muscular coat 
at the bristle-bundles, and this feature is well shown in the forms procured by the 
Challenger. He describes, however, the longitudinal layers as arranged in separate 
pennate processes which project inward from the circular coat. Though the dorsal and 
ventral longitudinal muscles are cut into isolated fasciculi of a flattened form by bands 
of fibres, no tendency to a pennate arrangement is noticeable. The oblique muscles are 
strong and decussate under the nerve trunks, their fibres mixing with those of the 
circular muscular coat. The structure of the body- wall is on the whole typical. Studer 
describes four pairs of genital sacs symmetrically arranged anteriorly on the ventral surface. 
Studer’s specimens came from Betsy Cove, Kerguelen, in 5 to 10 fathoms. 
Brada whiteavesii,^ n. sp. (PI. XLV. figs. 3, 4 ; PI. XXIIIa. figs. 9, 10). 
Habitat. — Dredged in Queen Charlotte Sound, in 10 fathoms. 
\ 
1 Archivf. Naturgesch., 1878, p. 113, Taf. v. figs. 1-10. 
^ Named after Mr. WMteaves, who first brought it under my notice during his dredging expeditions in the Gulf 
of St. Lawrence. 
