107 



tin- body appears less depressed than in most other Isopods. and, as the very much 

 elongated legs in alcoholic specimens are generally stretched downwards, the body, 

 unlike that of other Isopods, presents itself to the observer, as a rule, in u 

 lateral position. We know of 9 or 10 species of the genus, 5 of which belong 

 to the fauna of Norway, and will be described below. 



l. Munna Boecki, Kroyer. 



(PL XLIV.) 

 Munna Boeckii, Ki-oyer, Nat. Tidsskr. Bd. II, p. 612, PI. VI, figs. 19. 



Specific Character*. Body of female very short and thick, with the an- 

 terior division, seen from above, almost circular in outline; last segment of meso- 

 sonie very small. Caudal segment about half the length of the anterior division 

 of the body, ob-pyriform, lateral edges somewhat bulging in their anterior part, 

 and each armed with 4 short denticles, tip obtusely produced, and exhibiting 

 ventrally, on each side of the anal orifice, a coarsely serrated lamella. Eyes 

 rather large, semiglobose. Superior antenna- scarcely reaching to the middle of 

 the penultimate peduncular joint of the inferior ones, iiagellum composed of 6 

 articulations, the apical one being extremely small. Inferior antennae moderately 

 strong, about twice the length of the body, flagellum somewhat longer than the 

 peduncle. Legs rather strongly built, and rapidly increasing in length posteriorly; 

 1st pair with the carpus gradually widening distally, and armed inside with a 

 double row of slender spines, propodos oval inform. Last pair of legs exceeding 

 the body in length, carpal joint about the length of the 3 preceding joints com- 

 bined, and rather strong, widening distally, propodal joint long and slender, linear. 

 Uropoda very small, with the tip transversely truncated. Colour yellowish, very 

 slightly clouded with darker shadows. Length of adult female 4 mm. 



Remarks. This is the species first recorded, and ought accordingly to be 

 regarded as the type of the genus. It may be easily recognized from the other 

 species by the very broad, nearly circular fore-part of the body, the form and 

 armature of the caudal segment, the comparatively large eyes, and the long, but 

 rather strongly built legs. 



Occurrence. I have met with this form occasionally in a few localities 

 on the west coast of Norway, in depths ranging from 20 to 50 fathoms, on a 

 rocky bottom, overgrown with Hydroida and Polyzoa. Kroyer observed the species 

 at Trondhjem. 



Kattegat (Meinert). 



