80 THE VOYAGE OF H.M.S. CHALLENGER. 



species, such as Eurycope pellucida, are glassy and transparent, or Bemitransparent, and 

 have no pigment whatever, while those which are coloured, such as Eurycope sarsii, appear 

 to owe their coloration, which is diffused and even, to the subjacent muscles. In the presenl 

 species, which appears to have been nearly transparent during life, there is no pigment 

 recognizable anywhere in the integument, but there are two longitudinal masses of pigment 

 commencing near the head and running down along the back to a little way in front of 

 the caudal shield ; careful focussing with a high power made it apparent that there are 

 really four bands of pigment, two dorsal being superposed upon two ventral bands ; the 

 extension of these pigmented areas would correspond exactly with that of the hepatic 

 caeca, and in any case the pigment was situated well below the integument, as could be 

 determined by careful focussing ; the individual pigment spots were situated at regular 

 distances from each other, and had entirely the appearance of being contained in the 

 interior of uniformly-sized cells. 



The pigmented bands were wider in the head, and gradually tapered off towards their 

 posterior extremities ; the presence of the pigment spots naturally marked out the limits 

 of the tissue containing them ; there appears to me to be but very little doubt that the pig- 

 mented areas are in fact the hepatic caeca. I can see no reasons against this view, and in 

 favour of it are (1) the presence of the pigment below the integument ; (2) its disposition in 

 four longitudinal bands ; (3) the shape of these bands which are wider anteriorly, and 

 taper posteriorly ; and (4) the extension of the bands which commence in the head just 

 behind the masticatory stomach and reach to near the tail. 



The head is large and squarish in outline ; the frontal margin is straight, and there is 

 a wide interval between the insertion of the antennary appendages of either side, as in 

 Munnopsis latifvons, &c. 



The first segment of the thorax is much the shortest, and is not prolonged laterally ; 

 the second and third segments are subequal, and have about three times the diameter 

 (antero-posterior) of the first ; the fourth segment is about half as wide again as either 

 of the preceding segments. 



Each of these segments has a pair of long, curved, spiniform epimera, which 

 are directed outwards and somewhat forwards; the epimera of the second thoracic 

 are rather longer than those of either of the two succeeding segments, in every 

 case they are fringed with short spines. 



In the dorsal median line each of the four anterior thoracic segments has a long iq iwar< 1 1 v 

 and forwardly directed spine, which arises near to the anterior margin of the segment. 



The three posterior segments of the thorax are about equal in length ; this region of 

 the thorax is about twice the length of that occupied by the first four segments ; the 

 lateral diameter of the fifth segment is greater than that of the two following segments, 

 which decrease progressivel)*. 



These segments have the same general form as in Eurycope sarsii, &c, but are 



