REPOET ON THE ANNELIDA. 
483 
and they show a more distinct wing at each side than in any of the previous forms, 
while the shaft has also a deeper yellowish hue by transmitted light. 
The anterior hooks (PI. XXIXa. fig. 10) diverge from any species hitherto observed 
in the shortness and marked definition of the neck. The inward curve of the posterior 
outline is very decided, marking off the distal enlargement and the shoulder of the hook 
as in the Maldanidae. Anteriorly, also, the outline presents a slight inflection above the 
shoulder. 
The posterior hooks (PI. XXIXa. fig. 11) only slightly diff er from the foregoing 
forms. In most views two large teeth occur above the great fang, but these are not 
clearly defined in others, as the duplicate series intrude themselves in the line of vision. 
It is, indeed., a doubtful point to estimate the precise number of teeth that should be 
figured in a profile view of these hooks. The outline below the great fang {i.e., from its 
base to the anterior inferior projection) also differs in this species from any of the fore- 
going. The differential characters of these organs are thus somewhat fine. 
The food in the alimentary canal consisted of a whitish mud in which a few minute 
Globigerince and other Foraminifera, many of the spiked solid circular bodies observed 
in the coral sand from Bermuda and elsewhere, a few minute Pteropods, and sponge- 
spicules occurred. 
The structure of the body-wall is typical. The proboscidian region has been 
everted, yet it is filled with muddy debris. 
Kinberg’s Terebellides paciftca,^ from the Society Islands, may be this sjDecies. 
His description, however, is devoid of the minuteness necessary for recognition. In the 
Terebellides ypsilon, Grube, from the Philippines, the teeth of the hook are more 
numerous, viz., four above the great fang. 
Family Sabellid^. 
The number of species representing the family is considerable, viz., fifteen, and of 
these the majority are new. 
Schmarda gives eight species, chiefly littoral, and he does not discriminate between 
Sabella and Dasychone. Kinberg describes seventeen, the largest number procured in 
former voyages. Grube again has only four from the cruise of the “ Gazelle,” while he 
has twelve new forms in the account of the collection made by Semper in the 
Philippines. No example occurred in his Annulata CErstediana. Ehlers mentions four 
from the “Porcupine,” one of which, the common Sabella pavonina, reached the depth of 
725 fathoms. 
The majority of the Challenger forms had been procured between tide-marks or in 
shallow water, the former series at places where opportunities for shore-collecting seem 
' Op. cit., 1866, p. 346. 
