ö BOVALLIUS, A NEW ARCTIC ISOPOD. 



ted, the hinder sharply pointed. The fennir is long, broad, 

 three times longer than broad; a little broadev at the upper 

 margin than below; without hairs or bristles. At the lower 

 hinder corner is a short excavation for the reception of a 

 part of the genu. The gemi is long, about half the length 

 of the femur, with a short bristle at the hinder outer corner. 

 The tihia is shorter than the preceding joint, with two short 

 bristles at the inner margin, and one more slender at the 

 outer corner. The carpus is very short, scarcely half the 

 length of the preceding, with two very short tooth-like spines. 

 The metacarpus is long and stout, three times longer than 

 the carpus, with a tooth-like spine at the lower, inner corner. 

 At its lower end it projects into a peculiar, flattened, semi- 

 circular process, expressly adapted for the articulation with 

 the dactylus. At the base of the dactylus is an excavated, 

 rounded prominence, gliding against the metacarpal process. 

 In this way a strong and perfect articulation is obtained. 

 The dactylus is longer than the metacarpus. strongly hooked, 

 and very powerful. On its inner concave side is a large pris- 

 matic excavation for the reception of the lower inner angle 

 of the metacarpus. The last half of the dactylus is perforated 

 to the tip, probably the ductus of a secretory gland, which 

 is to be seen in the basal part of the dactylus and the nea- 

 rest part of the metacarpus. 



The second pair of pereiopoda [Pl. I. fig. 11]. l^Yve femur 

 is a little broader and more rounded than in the first pair, 

 but of the same length. The excavation for the reception 

 of the genu is larger. The genu and the tihia are like those 

 of the first pair. The carpus is half the length of the tibia, 

 it carries a strong curved bristle at the inner lower corner. 

 The metacarpus and its process shows exactly the same struc- 

 ture as in the first pair. The dactylus is not quite so strongly 

 curved, but very powerful, with the same sort of excavation 

 on its inner side, pretty like the hollowed claw af a cat. 

 [Pl. I. fig. 12]. 



The third pair [Pl. I. fig. 13]. They are a little longer 

 than the preceding ones, but very similar. The femur is 

 longer and narrower, linear. The excavation also is a little 

 narrower. The carpus is longer than half the tibia. The 

 dactylus is less curved and a little more slender. 



