1903.] NATURAL SCIENCES OF PHILADELPHIA. 429 



reach the middle of the ventral neuropodial lobe; the slender black 

 acicula are parallel, the neuropodial shghtly the longer. 



Anteriorly the parapodia become shorter and on the first and second 

 the notopodial setigerous lobe is lacking, the notopodial cirrus becomes 

 relatively shorter and the neuropodial longer than on the typical foot, 

 so that the ventral is the longer on the first and has its base constricted 

 and the cuticle in that region much thickened. Posteriorly all of the 

 lobes become even more slender and elongated, the neuropodium and 

 notopodium are even more closely appressed, the neuropodial cirrus 

 more widely removed and so much diminished in size that it scarcely 

 reaches to the base of the ventral lol^e, while the dorsal cirrus retains 

 its characteristic length. 



Setse all compound, nearly colorless and very transparent. Noto- 

 podial all alike, the stems slender and very regularly camerated, the 

 terminal socket symmetrical, blade remarkably slender, with capillary 

 tip and short fine hairs on the concave margin of the basal f ; those in 

 the dorsal part of the vertical row with much longer blades than the 

 ventral ones; similar setse occur in the dorsal and posterior part of 

 the neuropodium. In the ventral region of the neuropodium are a few 

 short-bladed compound setse ; their stems rather stouter but camerated 

 in a similar regular manner, the end more enlarged, the socket oblique, 

 the long limb of its margin receiving the septate cavity which is here 

 divided by a longitudinal partition; the blade hooked, guarded and 

 provided with, very stiff hairs directed distally. Several stouter setse 

 of this type occur in the anterior dorsal part of the neuropodium, but, 

 except for their slightly shorter blades, they differ in no noteworthy 

 manner from those just described. 



Exposed portion of maxillae brown, relatively short, broad, acute, 

 the edge with 3 teeth in the basal half separated by a wider interval 

 from a 4th double tooth near the apicalfang. Paragnathae brown, small, 

 conical, all separate, the posterior ones in each group somewhat larger; 

 group I, 5 in longitudinal series, the first minute, increasing in size 

 caudad; II, oblique elliptical areas, in 3 ranks, anterior lateral of about 

 4, very small, middle of 6 larger, posterior internal of 5 still larger; 

 III, a small longitudinally elongated group of 10-12; IV, nearly cir- 

 cular areas of 18-24; the basal circle absent. 



Head and anterior segments delicate rose-red, brightest on head and 

 gradually fading posteriorly. The specimens are immature, but differ 

 from all described species, especially in the character of the paragnathae 

 and feet. 



Two specimens, Suruga Bay, 3,707, 63-75 fms. 



