252 bullktin: museum of comparative zoology. 



2. EURYTHOE COMPLANATA (Pallas). 



Aphrodita complanata Pallas, Misc. zool., 1766, p. 109, pi. 8, fig. 1926. 



Numerous specimens of this widespread form from Panama (C. F. 

 Davis, received M. C. Z. in 1862), and Mazattan, Mexico (H. Ed- 

 wards, received M. C. Z. in 1873). 



POLYNOIDAE. 



3. Halosydna insignis (Baird). 



LepidonotiirS insignis Baird, Proc. Zool. soc. London, 1863, p. 106. 



Many deep-colored specimens collected by Mr. Agassiz at Crescent 

 City, in May, 1859. Numerous specimens labeled simply "Cali- 

 fornia, A. Agassiz." A specimen from Sacramento Bay, Calif., was 

 collected by Capt. H. Davis in April, 1859. 



4. Lepidonotus caeloris Moore. 



Proc. Acad. nat. sci. Philad,, 1903, p. 412, pi. 23, f. 12. 



Polynoe squamatus Johnson (non Linne), Proc. Calif, acad. sci. Zool., 1897, 

 ser. 3, 1, p. 166, pi. 7, f. 30; Treadwell, Univ. Calif, publ. Zool., 13, 

 p. 181. 



Two specimens San Francisco, Calif. (T. G. Cary) and one Gulf of 

 Georgia, Wash. (A. Agassiz). 



Hesperonoe, gen. nov. 



Differing from Antinoe in having notopodial setae of two very different 

 forms, the more numerous ones much stouter than the neurbpodials and a 

 fine, slender, capillary form. Neuropodials also of two forms, the more 

 slender supraaciculars of the Antinoe type with the long, fine, smooth tips, 

 and the subaciculars mostly stouter and with tips more approaching the 

 £unoe type. Otherwise agreeing with Antinoe. 



Genotype. — //. senilis, sp. nov. 



