350 APPENDIX. 
Sabellaria saxicava. (Baird.) N.S. 
This worm lives in the rock. The tube in which it 
lodges is solitary, and is evidently hollowed out of the 
solid (though not a very hard) rock by itself, and 
appears to be quite round. The thoracic portion of the 
body is round, the abdominal flattened, with an im- 
pressed line running down through its whole length. 
The head is surmounted by an opercular disc, composed 
of two rows of stout dissimilar bristles (palew). The 
inner row consists of about ten stout cylindrical sharp- 
pointed bristles of a dark-horn colour, gradually in- 
creasing in size from the dorsal margin towards the 
ventral. The outer row consists of about eighteen 
bristles, not so stout, flattened, and finely denticulated 
on both sides for about half the length. The post- 
occipital segment of the body is long, of a dark colour, 
somewhat wrinkled, and marked with three or four 
fleshy tubercles on each side. The thoracic feet are 
three pairs, and are broad but short. As only one 
specimen was found, it was thought unadvisable to 
dissect the whole worm out, in consequence of which 
the extremity has not been seen. Iam unable to say 
whether it terminates in a caudal appendage or not. 
The length of the exposed portion of the worm is 14 
inch, the breadth about 2 lines; probably the part en- 
closed in the tube may be of about equal length.—Hab. 
Esquimalt Harbour, Vancouver Island. (Brit. Mus. 
Col.) 
