322 PROCEEDINGS OP THE ACADEMY OF [Juiie, 



at depths of from 33 fathoms to 1,400 fathoms and chiefly among the 

 Santa CataUna and Santa Barbara Islands. The largest and best 

 preserved specimens are 40-44 mm. long and have 125 to 137 segments, 

 but some are only 12-20 mm. long. In some the eyes^ and particu- 

 larly the posterior pair, are enlarged until those on each side nearly 

 meet. There are indications that this condition may be correlated 

 with bathymetrical distribution, the approximation being most marked 

 in the examples from the greatest depth and least in those from more 

 shallow waters. 



When contracted the notocirri exhibit a distinct thickening above 

 the base, when extended they taper nearly uniformly from the 

 base, but in all cases the alternation in length is obvious. Some ex- 

 amples have the anterior twenty or so segments each marked by a 

 dusky band, not narrow and sharpl}^ defined as in S. armillaris, but 

 broad and ill defined. The accessory tooth of the seta appendages is 

 frequently much worn or nearly obsolete, causing the tips to appear 

 simple. In no case do the appendages exhibit any tendency to unite 

 with the stems, as in Pionosyllis elongata Johnson and other species of 

 the Synsyllis group. 



The chitinous lining of the pharynx terminates in a thickened, some- 

 what crenulated border, behind which is a circle of soft papilla? and 

 dorsally a large, blunt, conical tooth. In the retracted state the tooth 

 lies in somite III, the gizzard in XI-XXVII, the oesophageal loop in 

 XVIII and the caca in XVII and XVIII. 



S. californica Kinberg may be this species, but no certainty can be 

 reached from the brief diagnosis. The Eusyllis tubifex Gosse reported 

 by Treadwell from near Monterey Bay is very probably this species. 

 S. violaceo-flava Grube is another related species from the Philippines. 



Stations 4,326, off Point La Jolla, near San Diego, March 8, 280 

 fathoms, green mud; 4,400, between San Diego and San Clemente 

 Island, April 8, 500 fathoms, green mud; 4,420, off San Nicolas Island, 

 April 12, 33 fathoms, fine gray sand; 4,427, off Santa Cruz Island, 

 April 14, 447 fathoms, black mud and stones; 4,430, off Santa Cruz 

 Island, April 14, 197 fathoms, black sand and pebbles; 4,574, off Cape 

 Colnett, Lower California, October 8, 1,400 fathoms. 



Syllis (Ehlersia) heteroohaeta sp. nov. PI. XV, flgs. 1-4. 



Described from the type only, a small complete specimen 9 mm. long, 

 with a width, in the region of the gizzard, of body of .4 mm. and 

 between tips of parapodia of .7 mm. Segments 80. 



Prostomium (PI. XV, fig. 1) pentagonal, with very unequal sides, 

 the posterior longest and nearly straight, the lateral shortest and 



