1923] NATURAL SCIENCES OF PHILADELPHIA 255 



Eupomatus gracilus Bush. 



The funtioual operculum on the left side is funnelform marked 

 with thirty-four ribs each terminating in a small free marginal 

 tooth. From the interior of the funnel rises a brown, horny, 

 inverted cone, bearing at the upper margin a circle of ten stout 

 tapering spines abruptly l)ent at the ends at right angles inwards 

 into as many sharp claws which meet at a center. This and other 

 characters agree with Miss Bush's description but the terminal 

 hooks on the opercular spines are not mentioned, though she states 

 that the spines resemble those of E. uncinatus which are hooked. 

 On the right side is a rudimentary bulbous operculum. 



Station 4496, off Santa Cruz Lighthouse, 10 fathoms, fine gray 

 sand and rocks. . J" A ■ • .- 9 



Serpula columbiana Johnson. 



This species is well represented by tubes and worms. Usually 

 the funtional operculum is the left, with a rudimentary one on the 

 right side, but one specimen has this arrangement reversed and 

 another has two equally developed opercula. The number of 

 opercular ribs and teeth varies from 112 on a specimen 47 mm. 

 long to 158 on one 67 mm. long. Setigerous thoracic segmejits 

 are constantly seven and abdominal segments vary from 180 to 

 262. Pairs of branchial radioles are 28 to 52. Tubes are single or 

 more often in clusters, more or less tortuously encrusting stones, 

 from which the ends rise erect and free. This erect portion is 

 terete, white, stony, and either opake or porcellaneous; the attached 

 basal part is somewhat depressed with an internal longitudinal 

 flange. 



Stations 4417, off Santa Barbara Island, 29 fathoms, fine yellow 

 sand and coralline rock; 4431, off Santa Rosa Island, 38-45 fathoms, 

 mud and coarse gray sand; 4496, off Santa Cruz Lighthouse, 10 

 fathoms, fine gray sand and rocks. 



SABELLARIIDAE 

 Sabellaria cementarium Moore. 



Stations 4531, off Point Pinos Lighthouse, 26-28 fathoms, fine 

 gray sand; 4558, same locality, 28-40 fathoms, rocks. 



