BIHANG TILL K. SV. VET. AKAD. HANDLINGAR. BAND. 4. N:0 8. 17 



Tlte first pair of gnathopoda (Pl. 1, lig. 8) is articulated 

 to a rather big, irregularly cjuadraiigular basal joint, projecting 

 from, or at least immoveably coalescing with the inner upper 

 surface of the coxa or epimera. Besides the coxa, the arm 

 is composed of seven joints, including also therein the last 

 joint of the dactylus. The first joint or basis is the longest 

 of all, above bent and somewhat slight, its lower part very 

 broad ; in the posterior margin it carries several long, straight, 

 qnite smooth bristles ; in the hinder lower corner it has a bundle 

 of shorter smooth bristles. (Pl. III, fig. 33). The second joint, 

 ischium, is very small, quadrangnlar ; it carries in the lower 

 back corner a bundle of bristles, alike that of the preceding 

 joint. The third joint, meros, is bigger than the preceding 

 one, rhombic with but one pair of short bristles in the middle 

 of the hinder side. The fourtli joint, carpus, fastened along 

 the foremost side of the preceding joint, not at its point, is 

 big, although shorter than the first one, eggshaped; the hinder 

 or lower side carries 15 — 20 cross-going ranges of tactile 

 bristles (Pl. IV fig. &&); they are bent at the point and 

 swollen; beside this swelling the bristle projects in a hair- 

 like, short, sharp point. The foremost side is less curved 

 and carries 5 — 6 bundles of short, smooth bristles. The fifth 

 joint, jyropiis, is about half as long as the preceding one, 

 broad and swollen; the foremost side strongly, the posterior 

 one more feebly curved. On the foremost side near to the 

 point it carries 6 — 7 cross-going ranges of long blunt-pointed 

 feeling-bristles bent at the point (PL III fig. 45). Just be- 

 low the point it projects in a short, bent feeling-hair. The 

 posterior side carries five ranges of such bristles. On the 

 inner side the joint moreover has single bristles of the same 

 structure as the feeling-bristles on the hinder side of the car- 

 pus. The sixth joint, dactylus, is not the fifth as long as 

 the propus and somewhat slender; this as well as the unguis 

 is totally concealed by the long tactile bristles of the pro- 

 pus. It carries in the point a straight unciliated bristle. The 

 seventh joint, unguis, is quite claw- formed and of about the 

 same length as the dactylus. 



The second pair of gnathopoda (Pl. I, fig. 9) articulates 

 in the same way as the first one with a small basal-point, 

 immoveably nnited to the coxa. The basis is long, linear, it 

 carries in the hinder margin 9 — 10 bundles of long, smooth 



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