218 allan hancock pacific expeditions vol. 7 



Key to Species 



Notopodia with falcigerous setae (pi. 36, fig. 56) ; palpi greatly 

 elongate, cylindrical, the two widely separated at the base; 

 dorsal cirri attenuate, extending far beyond the tips of the 

 setae C. tentaculata, p. 218 



Notopodia without falcigerous setae ; palpi not elongate ; dorsal cirri 

 only moderately long (pi. 36, fig. 57) . . C. costae, p. 218 



Geratonereis tentaculata Kinberg 

 Plate 35, Fig. 47 



Ceratonereis tentaculata Kinberg, 1866, p. 170; Augener, 1913, pp. 168- 



170 (synonymy) ; Monro, 1933, p. 45. 

 Ceratonereis singularis Treadwell, 1929, pp. 1-3, figs. 1-8. 

 ff Nereis tentaculata Treadwell, 1914, p. 190. 



Collections.— \2-33, 114-33, 197-34, 210-34, 277-34, 498-36, 525- 

 36, 549-36, 607-37, 633-37, 634-37, 638-37, 639-37, 662-37, 683-37, 

 688-37, D-104. Numerous specimens. 



Falcigerous setae (pi. 35, fig. 47) are present, a few in a fascicle, 

 from about the twentieth parapodium. The articulation is slightly heter- 

 ogomph. Neuropodial falcigerous setae have a similar appendage, but the 

 articulation is clearly heterogomph. 



The description of Ceratonereis singularis Treadwell (1929, p. 1) 

 from Carmen and San Jose islands. Lower California, agrees well with 

 that for C. tentaculata Kinberg. Nereis tentaculata Kinberg was reported 

 from Pacific Grove, California (Treadwell, 1914, p. 190). It may be 

 questioned, however, whether the range of the tropical C. tentaculata ac- 

 tually extends so far north in the Pacific. 



Distribution. — Tropical and subtropical eastern and western Pacific; 

 Australia ; West Indies. Shore, to 40 fms. 



Geratonereis costae (Grube) 

 Plate 35, Fig. 48 



Nereis costae Grube, 1840, pp. 74-75. 



Nereis (Ceratonereis) costae Fauvel, 1923, pp. 349-350, fig. 136 (synon- 

 ymy). 



Collections.— \3-Z?>, 209-34, 702-37. 4 specimens. 



Two small epitokous individuals from La Libertad (13-33). A fe- 

 male has 17 anterior parapodial segments, the first 5 with modified dorsal 

 cirri ; there are 46 epitokal segments ; total length is 14 mm. A male, with 



