NO. 3 HARTMAN: POLYCHAETOUS ANNELIDS 337 



Pallasia sexungula Ehlers, 1897, pp. 125-129, pi. 8, figs. 194-202. 

 Johansson, 1927, pp. 90-91 (synonymy) ; Monro, 1933, p. 1066, fig. 14. 



Materials examined. — At the U.S. National Museum ; Port William, 

 Port Stanley, Falkland Islands, in 8-10 fms, and south of municipal 

 jetty on shore, coll. by W. L. Schmitt (2) ; Strait of Magellan, in 61 

 fms, coll. by steamer Albatross, station 2778, Jan. 3, 1888 (2). 



The operculum has about 1 1 pairs of paleae in the inner row and 

 about 16 to 18 pairs in the outer one. Those of the former have a shaft 

 that is nearly straight and the lateral teeth are directed outward (pi. 31, 

 fig. 36) ; they are not at all plumelike, as in /. pennatus (above). 



Distribution. — Originally described from Valparaiso, Chile, /. armatus 

 has since been recorded from other parts of western and southern South 

 America, and from Gorgona Island, Panama (Monro, 1933, p. 1066). 

 On the whole, its range appears to extend southward from that of I. 

 pennatus. Its bathj^metric range is intertidal to 20 fms. 



Idanthyrsus ornamentatus Chamberlin 

 Plate 31, Fig. 34 



Chamberlin, 1919, pp. 262-263, pi. 3, figs. 2-5. 

 ?Sabellaria saxicava Baird, 1863, p. 109. 



material examined. — Between Sitka and the Columbia River, in 66 

 fms, coll. by the steamer Albatross, station 2878, Sept. 25, 1888 (1); 

 near Canoe Bay, Alaska, coll. by W. L. Schmitt, Sept. 1940 (several). 



The outer opercular paleae (pi. 31, fig. 34) distinguish this from the 

 2 species mentioned above. The inner row of paleae includes about 8 

 pairs; the outer row consists of about 34 pairs. 



Earlier (1938, p. 16) I accepted Berkeley's (1930, p. 74) conclusion 

 in referring this to /. johnstoni (Mcintosh) from the Cape Verde 

 Islands. However, there are differences in the outer opercular paleae, 

 which may warrant the retention of Chamberlin's name. Sabellaria saxi- 

 cava Baird (1863, p. 109) from Vancouver may belong here, since its 

 range approaches that of /. ornamentatus, but it remains too incompletely 

 known to assign to any species. 



Distribution. — First described from Mendocino, California, it is be- 

 lieved to range north to Alaska, in depths to 66 fms. 



Genus SABELLARIA Lamarck 

 Type S. alveolata (Savigny) 



The operculum is provided with 3 apparent rows of paleae in which 

 all are visible externally. (Actually the middle and inner rows probably 

 represent a single series in which the middle paleae are directed outward 



