REPORT ON THE ANNELIDA. 
881 
ment tissue to which the oblique muscles are attached to the surface. The linear fibrillae 
of the longitudinal muscles in transverse section constitute a prominent feature. 
This species was dredged by Prof. Verrill ^ in 29 fathoms, off Block Island, and in 
Vineyard Sound, as well as off St. George’s Bank, in 150 fathoms. The range is thus 
very considerable. 
Scolecolepis cirrata, Sars, var. 2 (PI. XLV. figs. 5, 6 ; PI. XXIVa. fig. 6). 
Habitat. — Dredged off Sombrero and St. Thomas, West Indies, in 470 and 390 fathoms. 
The fragment, unfortunately, is not in good condition, so that the description is 
imperfect. The specimen seems to be about the average size of the European Scoleco- 
lepis cirrata. The diameter anteriorly is about 2 mm. 
The head somewhat resembles that of the form just mentioned, but the median ridge 
shows no tentacles, and there is no trace of eyes. The anterior feet perhaps have more 
ample foliaceous appendages and smaller branchiae. The state of the body posteriorly is 
such that accuracy in description is impossible. However, it is evident that instead of 
the row of hooks observed near the fiftieth foot in Scolecolepis cirrata, there are only 
about two (PL XXIVa. fig. 6) in this form. The main fang of the hook is shorter than 
in the ordinary European examples of Scolecolepis cirrata. 
In minute structure the body-wall of this specimen, though presenting certain 
variations, does not materially differ from that of Scolecolepis cirrata. The nerve-cords 
are unusually distinct and large, and there is considerable thickening of the cuticle in 
the median ventral area. 
Pi'ionospio, Malmgren. 
Prionospio capensis, n. sp. (PI. XLV. fig. 7 ; PI. XXIVa. figs. 7, 8). 
Habitat . — Dredged at Station 141 (off the Cape of Good Hope), December 17, 1873; 
lat. 34° 41' S., long. 18° 36' E.; depth, 98 fathoms; bottom temperature 49°'5, 
surface temperature 66°'5 ; sea-bottom, green sand. 
A fragment of the anterior region, measuring about 10 mm. in length, and with a 
total breadth, at its widest part in front, of 1'5 mm. 
The specimen is injured. The snout is proportionally larger than in Prionospio 
stecTistrupi, but the somewhat button-shaped appearance ventrally may be due to 
softening. The branchiae of the first foot are considerably larger than those of the fourth, 
and furnished at the tip with two processes (PI. XLV. fig. 7), a smooth filiform 
^ Eeport of U.S. Commissioners of Fish and Fisheries, 1873. 
