DE. BAIED ON SEVERAL GENERA OF EUNICEA. 353 



of a dark aeneous colour throughout, and iridescent. Head small, 

 with two comparatively large lobes. Labrum crenulated. Buc- 

 cal segment equal in size to the three succeeding ones. Tentacle, 

 antennae, and palpi annulated, short, not much longer than just 

 to reach beyond the margin of the head ; all of them of about 

 equal length. Body narrower at the two extremities ; anteriorly 

 it is so only for a short distance, about the first seven segments, 

 then becoming broad for a short distance, and again contracting 

 as it descends posteriorly. The first six or eight of the anterior 

 segments are wide, then they become narrow, and the breadth of 

 the body becomes greater till about the 60th segment, when 

 they again begin to increase in width, while the body itself begins 

 to decrease in breadth. This continues till they approach the 

 tail, when the thirty or forty last segments again become narrower. 

 The tail appears to be destitute of caudal cirri. The branchiae 

 are pectinate, though they do not appear to exceed five or six 

 filaments in number; they commence about the 24th segment, 

 and continue till near the lower extremity. 



Peet : — On the 24th pair the setx are of two kinds only ; they 

 are numerous and long. The simple setae are curved and flagel- 

 liform, or elongate-lanceolate. The compound setae are slender ; 

 the falciform appendage is long and slender, finely pointed, with- 

 out teeth, having exactly the appearance of a long slender bayonet. 

 There are four strong and black-coloured aciculae, blunt-pointed, 

 and a fifth not quite so strong or long as the others (? takes the 

 place of the uncinus). About the 60th foot or thereabouts there 

 appear to be only the four aciculae ; and two of these are not so 

 obtuse at the point as the others ; the setae are exactly similar 

 to those of the anterior feet. In the feet of the lower portion of 

 the middle third of the body, the simple setae are precisely the same 

 as those above : the aciculae are only two, dark and blunt-pointed ; 

 but two others accompany them, of a much lighter colour, not so 

 strong, and slightly curved at the apex. Pectinate setae appear 

 now ; they are of two kinds, one slender, with the head broad 

 and a number of very fine teeth, the other coarser, the head 

 slightly oblique, and the teeth strong and reduced to the number 

 of from four to six, resembling very much in appearance a five- 

 short-prouged silver fork. 



Sah. Brazil, Capt. John Parish, R.N. 



N.B. These are the only species of this genus the British 

 Museum at present possesses. The described species are not 

 very numerous, Quatrefages enumerating only nine. 



