KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 287 



lamina of the left mandible has the apical margin broad and sharply serrated; it is fixed 

 on a disc-like prominence as in Parathemisto japonica. The molar tubercle (PL XIII, fig. 

 9) is very broad and thin; the margins are fringed with sharp, broad teeth, and a inner 

 row of broad tubercles, each of which is tipped with a stout, smooth spine (PI. XIII, fig. 

 10 and 11). The mandibular palp is long and slender; the first joint is tolerably thick, 

 and cylindrical; the second' is more slender, and nearly twice as long as the first; the 

 third joint is more than half as long as the second, and tapers gently towards the apex; 

 the outer margin is densely fringed with minute hairs (PI. XIII, fig. 12). 



The labium has the lateral lobes larger, and more irregularly convex, than in 

 Parathemisto japonica. 



The first pair of maxillae (PI. XIII, fig. 13 and 14) are very similar to that pair 

 in P. japonica. The apical portion of the principal lamina has three curved, strong spines, 

 and is sparingly provided with hair-like bristles. The apical margin of the secondary 

 lamina is fringed with spine-like bristles, and has a strongly projecting tooth at the upper 

 corner (PL XIII, fig. 14). 



The second pair of maxillce (PL XIII, fig. 15 and 16) are thick, and almost tumid. 

 The apical portion of the principal lamina is short, and covered with hair-like bristles. 

 The secondary lamina has two stout spines at the apex, surrounded by long bristles, (PL 

 XIII, fig. 16). 



The maxillipeds (PL XIII, fig. 17 — 21) are very robust. The apex of the basal 

 portion, between the lateral laminse, is thickly covered with long, slender bristles. The 

 lateral laminae are broad at the base, and narrowly angular at the apex; the outer side 

 is strongly convex, and is set with slender bristles; the inner side is concave, and is spar- 

 ingly provided with bristles; the outer margin is curved, and fringed with four long 

 bristles, the inner margin is straight, and complicately serrated (PL XIII, fig. 17). The 

 median lobe projects strongly inwards, rectangularly to the basal portion; it is armed at 

 the apex with two curved spines, and is thickly set with long hairs. 



The perceon. The suture between the first and second segments is quite distinct 

 even in the youngest specimens, but the articulation seems to be less perfect than between 

 the other segments, at least at the dorsal side. The first segment is longer than the 

 second, and nearly as long as the third. 



The epimerals are a little longer than the under margins of the corresponding 

 segments; they are longer than deep, and have the corners rounded. 



The branchial sacks are broad below, and are considerably shorter than the femora 

 of the corresponding pairs of peraeopoda. 



The first pair of peraeopoda (PL XIII, fig. 23) are considerably shorter than the 

 second. The femur is as long as the three following joints together; it is narrow, and 

 without hairs or bristles. The genu is as long as broad, and has the hind corner thickly 

 set with long, slender bristles. The tibia is scarcely longer than the genu; the hind 

 corner is only a little produced; the hind and under margins are densely set with long, 

 slender bristles. The carpus is long, and only a little dilated; it is longer than the two 

 preceding joints together; the front margin is almost straight, and is fringed with long, 

 slender bristles; the hind margin is feebly curved, notched, and thickly set with bristles. 



