EEPORT ON THE ANNELIDA. 
207 
The head (PL XXIX. fig. 5) is smoothly rounded, but with a slight indentation in 
the middle line anteriorly. Two somewhat ovoid eyes occur, immediately in front of 
the first bristle -bearing segment, and behind the first (or buccal) lateral cirri. Such 
specks may represent the conjoined eyes of each side. In front of each eye (indeed 
separated by a considerable interval) is a short process, probably the homologue of the 
antenna. It hardly projects beyond the margin of 'the head. The pharyngeal and pro- 
ventricular regions of the alimentary canal are well developed. 
Each foot (PI. XXXIII. fig. 10) carries superiorly a dorsal cirrus, the lower division 
of which forms an ovoid swelling, while the distal part is somewhat filiform. The whole 
process is very short, and its surface is sparsely covered with wart-like papillae. The 
setigerous region has about five minute and somewhat slender bristles (PL XV a. fig. 22) 
which emerge beneath the two spines (at the tij) of the foot superiorly). The terminal 
appendage has a simple hook. The ventral cirrus is a short, slightly tapered process, 
which is considerably shorter than the setigerous region. Its surface likewise has a few 
warty papiUse. 
Posteriorly the tail has two short cmd on each side of the anus. 
The genus Sphcerosyllis was established by Claparede ^ in 1863 for two forms which 
he procured on the coast of Normandy, and the characters were amended in 1868.^ The 
Syllidians included in the genus are characterised by two large coalesced palpi, separated 
by a median sulcus. Pharynx straight and with a single tooth. Proventriculus follicu- 
lar, and the stomach short. Three antennae ; one pair of cirri on the buccal segment ; 
other segments with dorsal and ventral cirri. Antennae and cirri with tumid bases but 
not moniliform. No alternation of generations. 
The present example shows certain differences from the foregoing generic description, 
but it does not seem to approach any other form more closely. It appears to be a young 
specimen. 
Autolytus, Grube. 
Autolytus maclearanus, n. sp. (PL XXIX. fig. 6 ; PL XXXIII. fig. 5 ; PL XYa. 
fig. 15). 
Habitat . — Dredged at Station 149e (off Greenland Harbour, Kerguelen), January 21, 
1874; lat. 49° 37' S., long. 70° 16' E. ; depth, 30 fathoms; sea-bottom, volcanic mud. 
A small form, about 13 mm. in length and 1’5 mm. in diameter. 
The dorsum is slightly rounded, the ventral surface grooved in the middle, and 
marked laterally with the prominent cushions opposite each foot. The body tapers 
a little towards the tail. 
* Beobachtungen iiber Anat. n. Entwickelung., &c., p. 45. 
* Ami el. Cbetop., p. 204. 
