422 PROCEEDINGS OF THE ACADEMY OF [Juiie, 



tentacle. The first few neiiropodia are shorter and stouter than the 

 others, and the ventral cirri relatively longer; the last 3 parapodia are 

 much reduced in size. 



The elytra are fully exposed and, except the last pair, large, nearly 

 elliptical, but with a slight emargination at the point of attachment 

 on the lateral margin, from which point they extend inward and meet 

 in the middle line but do not overlap in full-grown specimens; they 

 are perfectly smooth, gelatinoid, pellucid and exhibit internally a 

 peculiar fibrous structure closely simulating the appearance of the 

 lacunae and canahculse of bone tissue. Fifteen pairs occur on II, IV, 

 V and succeeding alternate somites. 



Dorsal felt fibers are entirely absent, and the spines are so few and 

 small as to give to the species a characteristic unprotected aspect. 

 The follow^ing is the arrangement of the setae on a typical elytrophorous 

 somite of the middle body region. The notopodial aciculum projects 

 obliquely caudad and laterad, forming a pointed prominence, just 

 within which a tuft of light golden spines spreads through the emai-gina- 

 tion of and over the dorsum of the elytron. These spines are few in 

 number, and remarkably small and slender, both of which conditions 

 may be due to the loss of the longer spines. They have the usual 

 tapering, hollow stems, with the protuberances few in number and of 

 unusually large size, the spear-head flattened, long and acute, with 2 or 3 

 additional barbs on one side and 3 or 4 on the other. On the ventro- 

 posterior part of the notopodium is a tuft of delicate, flexible, finely 

 striated, hair-hke setae which spread chiefly downward and outward 

 over the anterior face of the succeeding parapodium. Neuropodium 

 supported by a stout central aciculum about which are grouped 6 or S 

 rather stout, rich brown setae, with long hollow shafts striated both 

 longitudinally and circularly, the outer } or -J bent, with a prominent 

 spur at the convexity, beyond that tapering and provided with a single 

 close row of very long hairs, the terminal ones of which envelop the 

 slightly curved point. Cirriferous parapodia differ chiefly in the 

 absence of dorsal spines and in having the capillary setae coarser, 

 stiffer, more numerous and spreading in a horizontal plain from a short 

 line on the dorsal surface anterior to the dorsal cirrus. A tuft of such 

 setae occurs on the peristomial parapodia; on II the neuropodials are 

 slender, and doubly fringed, and similar ones occur on III; those of 

 IV, however, are typical. 



Color pinkish. 



Bering Sea, 3,784, 85 fms. 



