218 University of California Publications in Zoology [Vol. 13 



are some very long thread-like setae which extend beyond the apex 

 of the gill. These thread-like setae are noticeably longitudinally 

 striated, but have no lateral wing. 



Each gill is finger-shaped and much wrinkled (possibly a result of 

 preservation). They are of uniform length throughout except for 

 the last pair, which are noticeably smaller. Dorsal to the gills are 

 many small spots, apparently the openings of epidermal glands. 



Collected in the following hauls: VI-1, in the outer San Pedro 

 Harbor in 3 fathoms on gray sand ; XXXII, off Santa Catalina Island 

 in 12 to 40 fathoms on green mud and sand ; XLI-1 to 3, in San Diego 

 Bay in 2 to 3 fathoms on coarse sand and broken shells ; 252, in San 

 Diego Bay in 3 to 5 fathoms on sand and mud. The type was from 

 an unknown locality. 



Type in the Museum of the University of California; co-type in 

 the American Museum of Natural History. 



Ophelina mucronata sp. nov. 



PI. 12, figs. 37, 38 



The length of specimens of this species varies with the degree of 

 expansion. A slender one, apparently much expanded, measured 

 thirty-five millimeters in length, and barely one millimeter in width, 

 while the type was twenty-five millimeters long and two millimeters 

 wide. 



The head is almost an equilateral triangle having rounded basal 

 angles and an apex prolonged into a short sharp-pointed process. There 

 is a pair of very faintly indicated sensory spots on its dorsal surface 

 (pi. 12, fig. 37). The mouth is situated barely one-half the length of 

 the head behind its apex. The pharynx, when protruded, consists of 

 three broad foliaceous lobes. Behind the mouth the ventral surface of 

 tlie head is very much swollen. The first setigerous somite is not sharply 

 separated from the prostomium, and that portion anterior to the seta 

 tuft is broader than the rest and continuous with the swollen sides of 

 the head, so that the first setae apparently arise at the boundary be- 

 tween the swollen head and this somite. The setae of the first tuft 

 are more prominent than of the immediately following ones. 



The body consists of about thirty-four somites, though it is not 

 easy to be accurate on this point because of the difficulty in discerning 

 the somite boundaries towards the posterior end of the body. For 

 the first twelve setigerous somites the body is nearly circular in cross- 



