THE COAST OF CALIFORNIA. 133 



tacles, four on each side. In one or two instances there 

 are more than four of these structures. Each tentacle when 

 retracted is dark colored on the distal end and more trans- 

 parent at its origin from the head. The first cephalic seg- 

 ment is prolonged into a rounded, more or less triangular 

 flap. The tentacles are inserted one behind the other, and 

 are penetrated by blood vessels in which a red fluid can 

 be readily distinguished through the body walls. 



The body tapers uniformly from anterior to posterior 

 extremity, the terminal segments of the tail being much 

 reduced in size. The anterior segments are brownish, 

 transparent ; the terminal segments are almost opaque. 

 The blood vessels with highly colored red fluid are con- 

 spicuous through the body walls. 



The spines are small and inconspicuous. They resem- 

 ble those of S. alveolata, to which species /S. Oalifornica 

 and /S. Pacifica are closely allied. 



SPIO CALIFORNICA sp. nov. 



A Spio which is different from any described species oc- 

 curs under the cliffs of Punta del Castillo at Santa Barbara. 



The tubes of this worm resemble those of Sabellaria but 

 differ from them in color, size and form of the openings. 

 The edges of the orifices are sharper and the tubes them- 

 selves are more compact. 



Head with two long tentacles. Each tentacle has on its 

 anterior border a double ridge of pigment bodies which en- 

 close a ciliated groove. These pigment bodies are mounted 

 on papillae and resemble rudimentary eye-spots. 



The tentacle is folded or annulated, almost jointed, and 

 transparent. The tentacles are inserted on the dorsal ceph- 

 alic region and through them there runs a yellow colored 

 vessel through which circulates a red blood or a similar fluid. 



The dorsal medium cephalic region is prolonged forward 



