KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 155 



margin there are also three very strong, slightly curved, spincs. 'iiie secondary lamina is 

 narrowly concave, covered with short bristles, and at each of the corners of the under 

 margin there is a short, thick, hooked spine. 



The second 'pair of maxillw (Pl. IX, tig. 8) consist of two laminte. The principal 

 lamina is very broad at the base; the projecting portion of it is almost cylindrical, and 

 all över covered with short bristles; the apex is rounded, and provided with a terminal, 

 strong spine. The secondary lamina is more slender, and co\'ered with bristles; the apex 

 is truncated, and armed with two strong spines. 



The 'ma.villipeds (Pl. IX, fig. 9). The basal portion is very broad, rapidly tapering 

 downwards, and as long as it is broad at the base. The lateral laminte are ovate, some- 

 what narrower at the apex; the inner margins are fringed with four long and some 

 shorter binstles. The median lobe forms a strong process directed inwards; the apex 

 is densely set with short, curved bristles. 



The perceon. The first segment is almost as long as the second; the seventh 

 segment is the longest, but only a little longer than the sixth. 



The epimerals are as long as the under margins of the corres])onding segments, 

 and rounded below. Those of the first and second pairs are deeper than long, the foUow- 

 ing longer than deep. 



The hranchial säcks (Pl. IX, tig. 13) are large and thick, showing a tendency to 

 divide into two portions. They are fixed to the second and four following pairs of pera^o- 

 poda, are somewhat longer than the femora of the corresponding pairs, and obliquely 

 truncated below. 



The Jirst pair of perceopoda (Pl. IX, fig. 10). The fem ur is shorter than the four 

 following joints together; the hind margin is slightly convex, and armed at the lower corner 

 with three bristles; the front margin is curved backwards at the base; the rest of the 

 margin is straight, showing a very long narrow groove for the reception of the following 

 joints. The genu is as long as broad, armed at the lower hind margin with tive or six 

 long bristles. The tibia is longer than the genu; the lower hind part is produced; 

 the under margin is fringed with e;ight or ten long bristles. The carpus is a little 

 shorter than the two preceding joints together, dilated, and covered all över with long 

 bristles; the front margin is nearly straight; the hind margin is convex, showing three slight 

 notches; the carpus is not produced; the under margins are straight, and fringed with 

 long bristles. The metacarpus is almost egg-shaped, densely covered with very long 

 bristles, and as long as the carpus; the front and hind margins are notched, the hind 

 margin not being serrated. The dactylus is slightly curved, and irregularly serrated 

 on the hind margin; it is shorter than the surrounding bristles, and almost entirely hidden 

 by them; it is scarcely as long as the breadth of the metacai^pus, and is less than a third 

 the length of the same joint. Glands are present in all the joints, except in the dactylus. 



The second pair (Pl. IX, fig. 11) are not longer than the tii^st pair and reach farther 

 than to the middle of the metacarpus of the third pair. The fem ur is broader than in 

 the tirst pair, and shorter than the four following joints together; tlie front margin is 

 strongly convex, with the usual narrow groove; the hind margin is slightly convex, the 

 lower corner being provided with two long bristles. The genu is as long as broad; at the 



