6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL.98 



excavate at its anterior margin, heavily and closely fringed at its post- 

 lateral margins (fig. i, b), and has many tall, slender tubercles, par- 

 ticularly crowded on its posterior two-thirds. These tubercles are 

 either simple, spinelike, or have their distal ends terminating in 2 or 



3 sharp cusps (fig. 1, c). Each spine arises from an elytral aero- 

 lation which is difficult to make out unless the elytrum is cleared, be- 

 cause of the abundance of the surface structures. 



Notopodial and neuropodial setae are disposed in stout, full, spread- 

 ing fascicles. The notopodial setae (fig. 1, d) are somewhat thicker 

 than the neuropodial setae (fig. 1, c), and extend nearly as far 

 laterally. 



This specimen departs somewhat from the original description in 

 the following: (1) The prostomium is broader than long, and has 



4 black eyes (fig. 1, a) ; (2) the aerolation of the elytra is much less 

 conspicuous, though obviously present; (3) the elytral fringe is 

 heavier and longer, and (4) the elytral tubercles are simple, bifid, or 

 trifid, though the bifid tubercles predominate. These differences are 

 perhaps not sufficiently great to indicate specific variation. 



Distribution. — Caribbean Sea (Treadwell) ; Old Providence Island, 

 Caribbean Sea. 



SCALISETOSUS, sp. 



Figs, i, f-k 



Collection. — Station No. 15-38; 1 specimen. 



Length 15 mm., number of segments 40, the last 2 small. Color of 

 dorsal and ventral sides, as also elytra, is diffused purple, but the 

 dorsum of each segment has 2 narrow, transverse, beadlike rows of 

 pale spots and a pale segmental groove. There are 14 (or possibly 15) 

 pairs of elytrophores, the last pair tiny. 



The prostomium is paler, but purplish, like the rest of the body. 

 It is nearly twice as broad as long, its lobes bulging and terminating 

 distally in minute peaks. There is a distinct median sulcus. The 4 

 eyes are disposed at the sides, posterior to the widest part of the 

 prostomium. The median ceratophore is inserted near the anterior 

 end, its style lost (fig. I, /). Paired prostomial antennae are long, 

 tapering, but greatly exceeded in length by the palpi. The latter are 

 somewhat annulated in their basal halves. The distal half tapers 

 gradually and ends in a blunt tip. The palpi are over twice as long 

 as the paired prostomial antennae. 



Parapodia are elongate, the acicular lobes drawn out in a tip, from 

 which the pale acicula project. The notosetal fascicles are less than 



