b BOVALLIUS, A NEW ARCTIC ISOPOD. 



basal joints of the first pair of antenn». The surface of the 

 head is smooth, wliite as ivory. 



The eyes are very large, oblong-ovate, separated from 

 each other only by a very narrow strip of the front. The 

 ocelli are large, arranged in eight rows. The pigment is very 

 black. 



The first pair of antennce [Pl. I. fig. 2] are long, reachino- 

 to two thirds of the second pereional segment, or to the 

 eighth joint of the flagellum of the inferior antennse. The 

 last joint of the peduncle is shorter than the two preceding 

 together, and carries a few hairs. The flagellum consists of 

 eleven joints; the first is only a little shorter than the last 

 joint of the peduncle [17 : 18], and equal to the three follow- 

 ing joints of the flagellum together. The flagellum tapers 

 towards its extremity; the last seven joints carry long hairs. 



The second pair of antennce [Pl. I. fig. 2.] are longer 

 than the first pair, reaching fully to the hinder point of the 

 epimeral of the third segment. The peduncle reaches to the 

 third joint of the flagellum of the first pair. The fourth 

 joint of the peduncle is the longest, nearly as long as the 

 three preceding together; the fifth is a little shorter and 

 carries some hairs and »auditory» bristles. The flagellum is 

 fifteen-jointed; the first joint is the longest, as long as the 

 two following together; it carries some hairs and one »audi- 

 toryj bristle. The last joint is the shortest. The last ten 

 joints carry each some few very short hairs. 



The mandibles [Pl. I. fig. 3.] are highly developed, bent 

 spirally, provided with a chisel-shaped molar process. They 

 carry each a slender three-jointed palp. The second joint 

 of the palp is the longest, the first and third are equal in 

 length, the third carrying a comb-shaped armature of bristles, 

 which are finely serrated at the upper margins [Pl. I. fig. 4 

 and 5]. 



The first pair of maxilke [Pl. I. fig. 6] are long, straight, 

 slender, with three large hooked spines at the tip and some 

 small tooth-shaped at the baseof the former. It makes a good 

 boring instrument. 



The second pair of maxillce are laminar, surrounding the 

 first pair as a tube. At the free margin of the tube are some 

 small hooked spines. 



