POLYCHAETOUS ANNELIDS FROM CALIFORNIA 



Including the Description of Two New Genera and 



Nine New Species 

 (Plates 19-26) 



By Olga Hartman 



The marine chaetopods of the Dillon Beach areas, in Marin and 

 Sonoma counties, are much like those from other parts of northern and 

 southern California. The 101 species, reported below, were collected 

 during the summers of 1935 and 1941. Seven species and one subspecies 

 are believed new to science, and some others are first records either from 

 California or from the areas indicated. The collections are deposited in 

 the Allan Hancock Foundation of The University of Southern Cali- 

 fornia ; a duplicate set is at the University of California. 



The areas investigated include, in Marin County, the muddy sand 

 flats of the upper end of Tomales Bay, the rocky shore of Tomales Point, 

 which is the outer end of the peninsula forming the western shore of 

 Tomales Bay, a long, sandy shore at Dillon Beach on the southern end 

 of Bodega Bay, and a brackish tidal stream called Stempell Creek, empty- 

 ing into Bodega Bay to the east and north ; and, finally, Bodega Lagoon in 

 Sonoma County. The extensive beds of broad-leaved eel grass (Zostera), 

 very abundant in Tomales Bay in the summer of 1935, are now practically 

 gone. The general aspect of the bay is thus notably altered at low water, 

 and the fauna there is, no doubt, significantly different. 



Special thanks are due Professor S. F. Light, of the University of 

 California, Director of the Summer Laboratory of Marine Zoology; 

 also, to students of Professor Light, who have aided in getting together 

 these materials, especially Dr. Frank A. Pitelka, who made numerous 

 collections in Tomales Bay, and Mr. Thomas L. Rodgers, who surveyed 

 the sandy beaches, also Miss Marian Pettibone for special efforts in 

 collection and preservation. I am deeply obliged to the Allan Hancock 

 Foundation for granting leave and for the use of equipment and facilities. 



The following species, by families, were collected. 



Family Polynoidae 



1. Arctonoe fragilis (Baird) 



2. Arctonoe vittata (Gruhe) 



3. Halosydna brevisetosa Kinberg 



4. Harmotho'e imbricata (Linnaeus) 



5. Harmotho'e lunulata (delle Chiaje) 



6. Lepidonotus caelorus Moore 



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