224 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



first 30 segments, the lobes proportionately longer more posteriorly, with 

 a gradual diminution of the parapodial bases. The dorsal cirri, however, 

 continue to surpass the dorsal lobes throughout (pi. 36, fig. 63). 



The paragnaths of the proboscis are disposed as follows : area I with 2 

 cones in tandem; area II with 12 to 15 well-separated cones in 2 or 3 ir- 

 regular rows, the cones slightly smaller than those of area I ; area III 

 with about 100 well-separated small, sharp-pointed cones; area IV with 

 a crescent of 20 to 30 sharp-pointed, small cones. Area V with none; area 

 VI with 4 tall pointed cones; areas VII and VIII with 2 rows of larger 

 pointed cones ventrally and about 3 rows laterally. The paragnaths of 

 these two areas exceed the others in size. Jaws are dark amber, translu- 

 cent, with about 6 obliquely truncate teeth. 



There are spinigerous setae in notopodia and neuropodia, homogomph 

 falcigerous setae (pi. 37, fig. 65) in notopodia from about the twenty- 

 eighth segment. These are unique in that the appendage is much like that 

 present in species of the genus Platynereis, the terminal end rounded, 

 with a small boss. Neuropodia are provided also with falcigerous hetero- 

 gomph setae (pi. 37, fig. 66). Anal cirri are long, slender, about as long 

 as the last 9 segments. 



Nereis pseudonereis has affinities with A^. falsa Quatrefages (see Fau- 

 vel, 1923, p. 337), in which similar notopodial falcigerous setae are pres- 

 ent. In the latter, however, the posterior parapodial lobes are not like 

 those in N. pseudonereis (pi. 37, fig. 72), and the transverse dorsal 

 striped pattern is absent. 



Holotype.— AHF no. 27. 



Distribution. — Galapagos Islands; Peru. In 3 to 15 fms. 



Nereis latescens Chamberlin 

 Plate 35, Figs. 53-56 



Nereis latescens Chamberlin, 1919, pp. 10-11. 



Collections. — 885-38, 904-38. Numerous specimens from southern 

 California. 



Length to 40 mm ; number of segments about 80. Paragnaths of the 

 maxillary ring are typically smaller than those of the oral ring. Area I 

 has 1 or 2 tiny teeth in tandem; area II has a triangular patch of 8 to 12 

 small teeth; area III has a broad band of small paragnaths that reach lat- 

 erally to area IV but are finer than those of the latter; area IV has a 

 crescent-shaped area of 3 irregular rows; area V has a single, exception- 

 ally large tooth ; area VI has 4 larger cones in a diamond arrangement ; 



