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 (palece). 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. I am unable to say 

 whether it terminates in a caudal appendage or not. 



The length of the exposed portion of the worm is 1 

 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.) 



