150 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



replaced by limbate setae.) The postsetal lobe is longer than the presetal 

 one throughout, but the former is never auricular as in L. tctraura 

 (above). From about the middle region of the body the postsetal lobe 

 elongates, is at first directed laterally and obliquely upvi^ard, but farther 

 back is more or less erect. Most of the median and posterior segments 

 are provided with only simple, hooded hooks ; occasionally a fine, limbate 

 seta is present in the superior part of the fascicle, but these are nowhere 

 conspicuous. Acicula and setae are yellow. 



The maxillary formula is much like that for L. zonata (above). The 

 forceps (maxilla I) are simply falcate; maxilla II may have 5 teeth 

 right and 4 left, or 4 teeth on either side (a specimen in the author's col- 

 lection, from Mission Bay, has 6 teeth right and 5 left) ; maxilla III has 

 2 teeth on either side, and maxilla IV has a single tooth on each side. 



In the original description (Moore, 1904, p. 491) the outline of the 

 prostomium was described as sugar-loaf shaped. Among the specimens 

 examined, some variation is noted in this respect. In some the prostomium 

 is shorter than broad, blunt in front ; in others it is more or less blunt, de- 

 pressed conical. This appears to fall within the range of variation for 

 species of this genus. 



L. heteropoda Monro (1933, p. 259) from Dry Tortugas, Florida, 

 bears many resemblances to L. erecta Moore ; in it the first 45 parapodia 

 lack hooded hooks, acicula are yellow, and the postsetal lobe comes to 

 elongate in the same way. I believe it to be different from L. heteropoda 

 Marenzeller (1879) from Japan, and consider L. erecta Moore distinct 

 from the Japanese species. Crossland (1924, p. 4) referred L. erecta to 

 L. heteropoda for reasons which are disputable. This has been discussed 

 elsewhere (Hartman, 1942, pp. 121-123). L. erecta is herein retained 

 for a common intertidal species, inhabiting the warmer waters of the 

 northeast Pacific. 



Distribution. — Southern California, south to western Mexico; shore 

 to 24 fms ; usually intertidal. 



Lumbrineris bassi, new species 

 Plate 10, Figs. 217-223 



Collection. — Lemon Bay, Englewood, Florida, shore. 



This is a long, very slender species, resembles a drilonereid ; it meas- 

 ures to 50 mm long and is less than 2 mm wide; it is nearly uniformly 

 thick throughout, and consists of 110 to 130 segments. The prostomium 

 is short, bluntly rounded in front, about as wide as long, slightly de- 

 pressed, lacks eyespots or other pigmentation. The first and second rings 



