1910.] NATURAL SCIENCES OF PHILADELPHIA. 331 



examination of specimens from the Calif ornian coast sent to him by 

 Dr. Johnson. Considered in this wide sense the species ranges along 

 the entire Pacific coast of America from the Straits of Magellan to 

 Stephens Passage, Alaska. 



Stations 4,421, southeast of San Nicolas Island, 291-298 fathoms, 

 gray mud and rocks (elongated form); 4,453, off Point Pinos Light, 

 Monterey Bay, 49 fathoms, dark green mud (short form); 4,457, same 

 locality, 40-46 fathoms, dark green mud (short form); 4,464, same 

 locality. 36-51 fathoms, soft dark gray mud (short form); 4,496, off 

 Santa Cruz Light, Monterey Bay, 10 fathoms, fine gray sand and rocks 

 (20 specimens of the elongated form). 



Halosydna californica (Johnson). 



Polynoe californica Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), 

 p. 387. 



Specimens of this handsome species from 12-30 mm. long occur in 

 the collection. The elytra present considerable color variation: 

 Some are pale brown with the characteristic reticular pattern ; others 

 have them of a nearly uniform reddish brown, with a white spot, 

 accentuated by a small deep brown spot, over the point of attachment ; 

 on one of the latter the first three pairs are translucent mottled grayish. 

 Two of the smallest and the largest one have the elytra pale uniform 

 gray with colorless lateral margins and no mottling and the white 

 attachment spots on those of the last two pairs only. The two stations 

 at which examples were taken yielded H. insignis also. No notes on 

 commensalism are furnished but the specimens from Station 4,421 

 were entangled with terrebelid tentacular filaments. 



Stations 4,421, southeast of San Nicolas Island, 291-298 fathoms, 

 gray mud and rocks; 4,496, off Santa Cruz Light, Monterey Bay, 

 10 fathoms, fine gray sand and rocks. 

 Halosydna interrupta v. Marenzeller. 



Halosydna interrupta v. Marenzeller, Denksch. d. kais. Akad. d. Wissensch. 



Wien, Math.-Nat. CI., LXXII (1902), p. 570, Taf. I, fig. 2. 

 Polynoe semierma Moore, Proc. Acad. Nat. Sci. Phila. (1903), pp. 402, 403, 



PI. XXIII, figs. 2 and 3. 



The occurrence of a well-preserved and apparently complete example 

 (though in three pieces) of this species in the collection permits of the 

 determination of the above synonymy and the correction of both 

 original descriptions, which were based upon incomplete and poorly 

 preserved specimens. The prostomium of the type of P. semierma is 

 badly macerated and the description based upon it quite incorrect 

 and misleading. The following description of the present example 

 is therefore supplied. 



