PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 167 



these is not far from tlie minute curved tip, so that the t-ip often appears 

 as if bifid. In this character it approaches the genus Eustlxendais of 

 M'Intosh, the validity of which may be doubtful. 



Salem Ilarbor, Mass., on muddy bottoms (J. H. Emerton, 1879). 

 Described from alcoholic specimens. 



Sthenelais picta Verrill. 



In this species, the scales are partially covered with very small, round, 

 slightly prominent, obtuse verrucje, and the free margin bears a row of 

 small, simple, rather slender, taperiag or fusiform, mostly acute papillce, 

 which are of unequal lengths, and placed at irregular distances, but 

 sometimes in small clusters. The seta3 of the dorsal ramus are numer- 

 ous, long and slender, but varying in size and length, the median and 

 lower ones being much the stoutest and rather strongly serrulate. In 

 the superior group of the lower ramus are several ^ery acute setse, 

 strongly spirally spiuulate toward the end; next to these are two or 

 three, or more, slightly longer, compound sette, with slender shafts, serru- 

 late near the joint, and bearing a long, slender, terminal piece, imper- 

 fectly jointed in the middle and slightly bifid at tip ; below these are 

 numerous, stout, compound setae, mostly shorter, with stouter, smooth 

 shafts, enlarged distally, and bearing a short, thick, terminal piece, 

 which is decidedly hooked and bifid at the tip ; some of the upper ones 

 in this group have the terminal piece more than twice longer than 

 broad, but most of them have it triangular and little longer than 

 broad; the next series of setai are slender, some with smooth shafts and 

 a slender, tapering, terminal portion, composed of two or three indistinct 

 joints, and bifid at tip; others, among the most inferior setue, have a 

 slender shaft, serrulate distally, witli a simple, slender, terminal piece, 

 bifid at tip, or more properly with a slender spine-like process arising 

 near to, and nearly as long as the sharp, incurved tip, which is opjiosed 

 to it. Grows to the length of G to 8 inches or more. 



Barnstable and Provincetowu, Mass., to Virginia, in sand, at low- 

 water. 



Sigalion arenicola, sp. nov. 



An elongated, moderately stout, depressed species, narrowed and 

 tapered posteriorly, and bearing very numerous, large, thin, white, trans- 

 lucent, smooth scales, which have large pinnate processes on their pos- 

 terior edge. 



Head small, shield-shaped, widest anteriorly, with a broad, slightly 

 rounded lobe in front, and with the anterior angles rounded; ocelli small, 

 but distinct, forming a quadrangle on the top of the head, the two pairs 

 near together. A pair of minute, obtuse antennae at the front, edge; no 

 trace of a median antenna. Scales, except the smaller, rounded, anterior 

 ones, large and somewhat quadrangular, with three of the angles; 

 rounded; on the posterior border there are about eight to ten well- 

 separated, large, deeply pinnate processes, borne on simple, slender 



