56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



completely known to permit comparison. P. chilensis was later reported 

 by Grube (1876, p. 60) who reported the presence of 16 pairs of elj^tra, 

 but figured 29 pairs, hence the latter is clearly not the species described 

 above. 



Holotype. — AHF no. 7. 



Distribution. — Independencia Bay, Peru ; Gorgona Island, Colombia. 

 Intertidal to 21 fms. 



Family Sigalionidae 



The Sigalionidae are largely to be obtained only by dredging. Only 

 a single species, Sthenelais fusca Johnson, is know to exist in the inter- 

 tidal of the northeast Pacific. Many of the known species occur in 

 depths of 500 fms. or over, a few in the subintertidal. The work of the 

 Allan Hancock Pacific Expeditions was done largely in depths of 100 

 fms. or less, hence the collections are unusually rich in little known, 

 or new, species from shallower waters. Fourteen species in 5 genera 

 are represented. Of these, 1 genus {Eusigalion Augener) has not here- 

 tofore been known outside of western Africa, and 10 species or sub- 

 species are new to science (see below). 



Six genera (Leanira, Pholoe, Psammolyce, Sigalion, Sthenelais, and 

 Sthenelanella) have been previously reported. Two of these (Pholoe and 

 Sigalion) are not represented in the present collections. Pholoe, in the 

 Pacific, is known only from records for Washington, northward. Sig- 

 alion, reported only as S. pourtalesii Treadwell, is not the same as S. 

 pourtalesii Ehlers from the West Indies, but is herein referred to Eiisi- 

 galion spinosinn, new species (see page 60). 



A key to the genera of SIGALIONIDAE included in this report 

 follows : 



1. Prostomial lobe trapezoidal, widest anteriorly, its median an- 

 tenna small, inconspicuous, inserted on a short base without 

 ctenidia; neuropodial setae bifid distally . . EUSIGALION 



1. Prostomial lobe subglobular, the anterior median area concealed 

 by the base of a conspicuous median ceratophore, with a pair of 

 lateral ctenidia 2 



2. Third setigerous segment with a dorsal cirrus; elytra with lobu- 

 lar, papillated processes, and encrusted with sand particles . . 

 PSAMMOLYCE 



2. Third segment without dorsal cirrus ; elytra without marginal 

 lobes though often with marginal fringe 3 



