NO. 3 HARTMAN : POLYCHAETOUS ANNELIDS 227 



small cones, including an irregular row of larger cones on the maxillary 

 side and about 3 or 4 rows of smaller cones on the oral side. 



Distribution. — Mediterranean ; San Esteban Island, Gulf of Califor- 

 nia. Shore. 



Nereis mediator Chamberlin 

 Plate 35, Fig. 57 

 Nereis mediator Chamberlin, 1918, p. 174; 1919, p. 11. 



Collections.— 902-3^, 904-38, 906-38, 913-39. 6 individuals. 



Length to 60 mm ; number of segments about 80. Prostomium slight- 

 ly longer than wide, its antennae not reaching distally as far as the palpi. 

 Peristomium about twice as long as the second segment, smooth dorsally 

 and ventrally, usually forming a tumid lower lip, which, when the pro- 

 boscis is retracted, is often produced forward beneath the palpi. 



Paragnaths are pale to dark brown. Area I has 2 or 3 teeth in tandem ; 

 area II has about 16 small cones in a crescent; area III has 3 or 4 trans- 

 verse rows of tiny paragnaths forming an oval patch ; area IV has a 

 curved patch of paragnaths larger than those of area III ; area V has 3 or 

 4 tiny cones or sometimes none ; area VI has 4 large, tall cones disposed in 

 a diamond arrangement; area VII has a few small cones in a patch on the 

 maxillary side and several rows of mostly larger paragnaths; area VIII 

 has larger paragnaths, in a broad band, continuous with those of area VII. 



Posterior parapodia have elongate, rectangular lobes, the dorsal and 

 ventral sides approximately parallel (pi. 35, fig. 57). Homogomph fal- 

 cigerous setae are present in fascicles of 1 to 3 in posterior parapodia, usu- 

 ally unaccompanied by other setae. 



Distribution. — Northeast Pacific, south to southern California. In- 

 tertidal. 



Nereis callaona (Grube) 

 Nereilepas callaona Grube, 1856, pp. 165-166. 



Nereis callaona Ehlers, 1901, pp. 108-109, pi. 13, figs. 13-20 (synony- 

 my). 

 Nereis heterocirrata Treadwell, 1931, pp. 1-2, fig. 1; Hartman, 1938, 



p. 14. 

 Nereis eucapitis Hartman, 1936, pp. 468-469, fig. 46. 



Collection. — 127-33. 5 specimens. 



Fauvel (in litt.) has suggested the synonymy given above. I have been 

 able to compare descriptions and collections only from southern Califor- 

 nia and the Gulf of California. Grube's original specimens came from 

 Peru. A comparison with South American collections would be desirable. 



Distribution. — Eastern and western Pacific. Littoral. 



