60 ALLAN HAXCOCK PACIFIC EXPEDITIONS VOL. 7 



Surface is smooth save for a few cirriform papillae along the outer, 

 lateral portion near the marginal fringe (pi. 12, fig. 142). 



The parapodial structures are not much different from those in E. 

 spinosum (see above), except that the setae vary in details. The noto- 

 podial setae are delicately serrated ; a few of the inferiormost are much 

 smaller and quite smooth (pi. 12, fig. 148). The neuropodial setae in- 

 clude a few dorsal, simple, spinose setae (pi. 12, fig. 149) and numerous 

 composite setae. These have a smooth (pi. 12, fig. 150) or spinose shaft 

 (pi. 12, figs. 151, 152) and slender, bifurcated appendages, with or 

 without articulations. The secondary tooth is, in most instances, long 

 but does not project beyond the main fang (pi. 12, fig. 150). 



Eusigalion hancocki differs from E. spinosum (page 60) in its pro- 

 stomial proportions and in its setae, as described above. 



Holotype. — AHF no. 9. 



Distribution. — Off San Jose Light, Guatemala (Holotype) ; Gulf 

 of California, Mexico; Isabel Island, Mexico; La Libertad, Ecuador; 

 Albemarle Island, Galapagos. Sublittoral to 32 fms. Two specimens 

 (74-33) from Albemarle Island were caught with the use of an electric 

 light, at night. 



Genus STHENELAIS Kinberg 



Body elongate, tapering, consisting of numerous segments ; elytra 

 more or less completely covering the dorsum. Prostomium anteriorly 

 rounded, usually with 4 eyes disposed in a rectangle, the anterior pair 

 at the anterior margin of the prostomium, more or less concealed from 

 the dorsum by the median ceratophore, the posterior pair usually on the 

 dorsal side of the prostomium. Median antenna stout, its ceratophore 

 with a pair of lateral, flaring ctenidia. Paired lateral antennae inserted 

 on the first setigerous segment. Palpi long, often exceeding in length 

 the first 10 or more segments. First segment elongate, directed anteri- 

 orly, provided with setal fascicles. Parapodia biramous, the notopodium 

 with simple, pointed setae, transversely serrated along one or both edges, 

 or almost smooth; neuropodium with only composite setae, or also with 

 simple, spinose superior setae (pi. 13, fig. 153). A ciliated tentacular 

 cirrus (=branchia) on all or most parapodial appendages, posterior to 

 the first few segments. Area between the tentacular cirrus and the 

 notopodium with a series of ciliated ctenidia. 



