376 Dr. T. Scott on some 



of the ceplialo trior ax ; the abdomen is composed of three 

 segments, the first being the largest. The antennules are 

 very short, moderately stout, and composed of four joints, 

 and are provided with tolerably long branching setae. The 

 natatory legs are similar to those in M. conjunctiva. The 

 fourth pair (tig. 10), which have both rami three-jointed, are 

 provided with densely plumose setae ; the outer ramus is 

 somewhat longer than the inner and has a short seta on the 

 inner margin and a short spine on the outer distal angle ; 

 there is also a short spine on the outer distal angle of the 

 end joint ; the marginal seta on the second joint and those 

 on the third joint are all elongated and plumose, except that 

 the outer one on the last joint differs from the others in 

 having its outer edge fringed with minute spinules. The 

 middle joint has no spine exteriorly, but the rounded distal 

 angle bears a few small bristles; the first and second joints 

 of the inner ramus have neither spines nor setae on the 

 exterior margin, but they each bear a long plumose seta on 

 the inner margin, and five similar setse spring Irom the inner 

 margin and end of the third joint. 



The fifth pair of legs are small, slightly expanded, and 

 bilobed ; the inner lobe is without armature, but the outer 

 is furnished with three setae, one on the outer margin and 

 two at the apex (fig. 11). 



The bifurcated setiform appendage, which springs from 

 the underside of the genital segment and upon which the 

 eggs are clustered, is tolerably slender and elongated, being 

 about equal to the entire length of the animal, the antennules 

 included. The caudal rami are short and somewhat diver- 

 gent ; they are each provided with four setae ; the second 

 seta from the inside is slender and only of moderate length, 

 but the others are stout and considerably elongated ; one 

 springs from the outer margin and the others from the apex. 



Colour. As is usual, the body of the animal is of a reddish 

 colour, but the cluster of eggs is bright green ; the size of 

 the egg-cluster varies in different individuals. 



Hab. Vicinity of the Falklands ; collected by tow-net ; 

 one specimen at 6 fathoms and four at the surface. 



Remarks. Though the Monstrillidae are widely distributed, 

 and a number of species have been described, yet compara- 

 tively few of them appear to have been obtained by expe- 

 ditions to the Antarctic or Subantarctic Oceans. The some- 

 what erratic appearances of these organisms may probably 

 be one reason for the apparent scarcity. Even in the British 

 seas, though the Monstrillidfe are usually not very common, 



