NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 69 



The unique character of the neuropodial setae and the spiny elytra 

 distinguish this species from others of the genus Sthenelais. It is desig- 

 nated S. neoleanirae because its composite neuropodial setae taper 

 rapidly to a slender tip, which is, however, bifid. 



Holotype.— AHF no. 12. 



Distribution. — Escondido Bay, Carmen Island, Gulf of California, 

 Mexico. In 60 fms. 



Genus STHENELANELLA Moore 



Prostomium subglobular, resembling that in Sthenelais Kinberg, 

 with a stout median antenna at the base of which are flaring ctenidia; 

 eyes 4, black, disposed at the anterior face of the prostomium, and near 

 the dorsal bases of the median ceratophore. Paired prostomial antennae 

 inserted on the peristomial segment, as in Sthenelais. Elytra inserted as 

 in Sthenelais. Notopodial setae numerous, long, slender, hair-like, with 

 fine transverse serrations. Neuropodial setae of one kind, composite, 

 with a smooth, or only slightly spinose, shaft and a smooth, slightly 

 falcate appendage; the dorsalmost neuropodial setae have a propor- 

 tionately longer, slenderer appendage than those more ventral. Only a 

 single species, S. uniformis Moore (1910, p. 391), is known. 



Sthenelanella uniformis Moore 



Plate 18, Figs. 226-231 



Sthenelanella uniformis Moore, 1910, pp. 391-395, pi. 33, figs. 105-112; 

 Treadwell, 1914, p. 184. 



Collections.— 213-34, 259-34, 876-38, 878-38, 895-38, 900-38. About 

 12 specimens. 



The first elytra are orbicular, with a short, close marginal fringe 

 along the anterior edge (pi. 18, figs. 226, 227). More posterior elytra 

 are subrectangular to rhomboidal (pi. 18, fig. 228) with entire margin. 

 The first 8 to 10 pairs have irregular patches of rust-colored pigment, 

 most conspicuous on their proximal halves (pi. 18, fig. 228). Parapodia 

 are short, blunt, the neuropodial setae in trim, perpendicular fascicles, 

 all of them resembling one another (pi. 18, figs. 229 to 231) except in 

 a few of the anteriormost parapodia, but differing slightly in propor- 

 tions; the appendages of the superiormost are longest (pi. 18, fig. 231). 



From the sixteenth segment, a long trailing fibrillar strand emerges 



