BIHANG TILL K. SV. VET. AKAD. HANDLINGAR. BAND. 4. N:0 8. 19 



imcle of the gill-bladder is given off. This latter is large 

 and of a firm consisteuce ; within it is provided witli longi- 

 tudinal lamellae. The basis is long, linear, provided with very 

 strong miiscles. On the foremost margin it has a few very 

 short bristles; in the hinder margin it carries long, plumose 

 ciliated hairs. The ischium is small and short, with a bundle 

 of bristles at the lower posterior angle. The meros is elonga- 

 ted, anteriorly mnch broader than posteriorly, vv^ith the angles 

 projecting in rounded processes, provided with short, straight 

 bristles. The anterior margin carries 10 — 12 thinly ciliated 

 long hairs. The posterior margin is strongly denticulated with 

 bundles of ciliated hairs in the notches. The carpus has a 

 very exceptional form. The carpal process, namely, is strongly 

 produced in a level rectangiilar to the surface of the carpus, 

 with the lower side hollowed out and the foremost margin 

 rounded, so as to resemble a flat spoon. Its margin is bor- 

 dered by some long, ciliated bristles, and several straight 

 spines. The carpus itself carries in the lower anterior angle 

 several short, smooth bristles. Through this joint, as through 

 the preceding, there run thick, strong muscles. The propus 

 is formed like the carpal process but a little more slen- 

 der. Its inner side, which is directed towards the carpal 

 process, is excavated. It articulates with the carpal process, 

 forming with this as it wcre a kind of double scoop. On the 

 rounded margin it carries strong spines, alternating with those 

 on the carpal process. Dact/jlus is totally wanting. 



The second pair of pereiopoda (Pl. II, fig. 11) is nearly 

 of the same structurc as the preceding pair of legs; it differs 

 only by the meros being considerably broader and also in 

 the armour of the carpus and propus. The carpal process 

 has on its margin long, unciliated bristles and across the 

 inner side a range of strong spines. The propus is armed 

 in a corresponding manner. The dactylus is wanting as in 

 the preceding pair. v 



The third pair of pereiopoda (Pl. II, fig. 12) is smaller 

 tlian the following, but, as in these, its artides are all lami- 

 nar. The basis is broad, almost circular, its margins beset 

 with bristles, anteriorly ciliated, on the posterior margin 

 smooth. The ischium is small and triangulär, with some few 

 bristles in the front-margin. The meros is large and broad, 

 the front-margin is coarsely serrated, every thooth carrying a 



