PAIWA ABYSSI. 459 



so that the ends project freely ; the lobe projects directly caudad from the elevated 

 region of the somite. 



The notopodial setae are numerous, long, finely pointed, and with the tips 

 often curved; distally each is bilimbate; the shaft is densely fibrillate. The 

 uncini are small and short; on the convex side, or base, there is a low, obtuse, 

 angular projection which may show a narrow tubercle or point. On the opposite 

 side there is a smooth, narrowly rounded lobe at one end, the rest of the edge 

 being occupied by four or five series of teeth. The teeth decrease in size from 

 the inferior process, three at the apex, when detectable, being minute. The for- 

 mula is often 3+2+2+3+2 (1). 



Locality. Toward the Marquesas: Sta. 3684 (lat. 50° S., long. 137° 54' 

 W.). Depth 2,463 fms. Bottom of greyish yellow Globigerina ooze. 10 Sep- 

 tember, 1899. One specimen. 



Paiwa, gen. nov.^ 



Total number of somites about forty, of which eighteen bear capillary setae, 

 these beginning with the second somite. Uncini beginning on the sixth somite. 



Tentacles numerous, slender, cylindrical. 



No paleae present. 



Four pairs of subulate branchiae. 



Parapodia of abdominal region each presenting a ventral uncinigerous torus, 

 a short notopodium, and a long cirrus. 



Notopodial setae capillary, slenderly pointed, narrowly bilimbate. Uncini 

 with base long; pectinate along free edge as in related genera. 



Genotype. — Paiwa abyssi, sp. nov. 



Differing from Samytha Malmgren and allied genera which lack paleae 

 in having eighteen setigerous somites and four pairs of branchiae. 



Paiwa abyssi, sp. nov.^ 



Plate 76, fig. 7-9; Plate 77, fig. 9, 10. 



Thorax of nearly uniform width except at caudal end, where it narrows to 

 the width of the slender abdomen or, in some, more gradually narrowing from 

 the anterior' end. The abdomen narrows continuously from the anterior end 



' Gosiute^paiwa, a mythical aquatic creature. 

 * abyssus, depth. 



