244 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.10 



Halosydna brevisetosa Kinberg 



Kinberg, 1855, p. 385; Hartman, 1939, p. 34 (with synonymy). 

 Polynoe brevisetosa Johnson, 1897, pp. 167-170, pis. 7, 8. 



This is very common throughout the Dillon Beach areas; it is free 

 living under stones and in crevices, among mussels, and commensal in 

 tubes of Thelepus crispus, Platynereis agassizi, and Pista pacifica. Both 

 dark and light color phases abound. Length is about 30 to 60 mm. This 

 was the first species of polychaete described from California; Kinberg 

 collected it at Sausalito, in San Francisco Bay. 



Arctonoe vittata (Grube) 



Polynoe lordi Johnson, 1897, pp. 175-177, pis. 7, 8. 

 Hartman, 1939, p. 29 (with synonymy). 



At Tomales Point, ocean side, it is commensal with Cryptochiton 

 stelleri (Middendorff), Diadora aspera (Eschscholtz), Dermasterias 

 imbricata (Grube) ; rarely it is free living. Length is about 40 to 50 mm. 



Arctonoe fragilis (Baird) 



Polynoe fragilis Johnson, 1897, pp. 179-181, pis. 7, 8. 



At Tomales Point, ocean side, it is commensal with species of Pisaster. 

 Length is 45 to 65 mm. 



Lepidonotus caelorus Moore 



Moore, 1903, pp. 412-414, pi. 23; 1905, pp. 546-547, pi. 36. 

 Hartman, 1938, p. 108; 1939, p. 44. 



At Tomales Point, ocean side, it was taken from kelp holdfasts. 

 Length is 30 to 40 mm. 



Harmothoe imbricata (Linnaeus) 



Fauvel, 1923, p. 55, fig. 18. 



At Tomales Point and Dillon Beach, this occurs in rocky crevices and 

 under sea urchins. Eggs are carried under elytra in June. Length is 30 to 

 45 mm. 



Harmothoe lunulata (delle Chiaje) 

 Plate 20, Figs. 10-22 



Fauvel, 1923, pp. 70-73, fig. 26; Berkeley, 1941, p. 21. 

 H. lunulata var. pacifica Monro, 1928, pp. 559-560. 



Numerous collections come from Tomales Bay, especially from the 

 burrows of Leptosynapta albicans (Selenka). Total number of segments 



