1909.] NATURAL SCIENCES OF PHILADELPHIA. 321 



THE POLYCHJETOUS ANNELIDS DEEDGED BY THE U. S. S. "ALBATROSS" OFF 



THE COAST OF SOUTHERN CALIFORNIA IN 1904. L SYLLIDJE, 



SPHJERODORIDJE, HESIONIDJE AND PHYLLODOCIDJE. 



BY J. PERCY MOORE. 



Until in 1904 the U. S. Bureau of Fisheries, the University of Cali- 

 fornia, and Stanford University joined forces in initiating an investi- 

 gation of the marine biology of California upon a comprehensive 

 scale, most of the faunal work done on the invertebrates of that region 

 had been limited to the littoral zone, and much of it had been of a local 

 or desultory character. 



Early in that year the Fisheries steamer "Albatross" was detailed 

 to investigate the deeper waters off the coast of the southern half of 

 the State. From March 1 to April 15 collections and physical obser- 

 vations were made at 139 dredging stations in the region south of 

 Point Conception, chiefly in the vicinity of San Diego and among the 

 ♦Santa Catalina and Santa Barbara Islands. Between May 10 and 

 June 15, 128 dredging stations were established in Monterey Bay, 

 making 267 in all. The full data relating to these stations have been 

 compiled and published as Fisheries Document No. 604, Washington, 

 1906. 



Among the material gathered is a rich but rather indifferently 

 preserved collection of Polychaeta which was submitted to the writer 

 for study, especially through the interest of Prof. Charles H. Gilbert, 

 of Stanford University. Coming from the deeper waters, this collec- 

 tion admirably supplements the shore collections from the vicinity of 

 San Diego and Monterey Bay contained in the Stanford University 

 Museum and already reported upon in these Proceedings. It had been 

 expected that the bulk of the collections would be made up of known 

 shore forms, but the large number of undescribed species encountered 

 in the families already studied has dispelled that anticipation. Types 

 of new species are to be deposited in the National Museum, and sets of 

 cotypes and duplicates, as far as possible, also in the cooperating 

 Universities and this Academy. 



SYLLID^. 



Syllis alternata Moore. 



This species is the most common syllid in the collection and occurs 

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