2(i 



Gen. 3. Hyale, Hathke, 1837. 



Syn: AlliiirJicsU-s, Dana = (j", 



5 Nicea, Nicolet = Q. 



Pxidv n'rcatly rdmprossiMl, but witli tlie l)ai'k rnuiidod. Tlic 4 aiitfrinr 

 ]iairs of coxal plates i-atlier deeji and snli(M[nale in .size, the 3 po.steridr ones 

 inneli lower. Snperinr antennae longer than the pednnele of the inferior, the 

 latter somewhat stronger in male than in female. Oral parts on the whole 

 rather similar in structure to those in the 2 pi'eoeding genera, sa^-ing that the 

 1st pair of maxilliP has a distinet thongh very small and naii'ow palp, and 

 that the palp of the niaxillipeds eonsist.s of the normal nnndier of joints. 

 Both pairs of gnathopoda suhchelifoi'm, in female nearly suhequal, in male 

 very unerpial, the posterior fines heing nuieh stronger and terminating with a very 

 large and powerful hand. Branchial lamella^ of normal structure, though 

 rather small. Incubatory lamellae very large and broad, with the edges 

 densely ciliated. Pleopoda sonu-'what larger than in the 2 preceding genera 

 and having the natatory setae, plumose. Uropoda about as in ( li'chestia. 

 Telson small, unarmed, cleft to the base. 



]t('ni(ir/.s. — It is evident that IVieck was right in uniting the two 

 genera Alhirclicstcf Dana and Niroa Nicolet, as only founded on sexual cha- 

 racters, and likewise in stating both to be merely syuouyraous to the genus 

 HijaJe of Rathke. In several characters this genus would seem to form a 

 connecting link between the «Saltatoria» and «Natantia» of earlier authors, 

 and the species are also in their habits not so evidently terrestrial as those 

 belonging to the 2 previously mentioned genera. The genus comprises niunerous 

 species occuriing, it would seem, in all jiarts of the world. Two distinct 

 sjiecies belong to the Norwegian fauna. 



3. Hyale Nilssoni, (Rathke). 



(PI 11, lis 1). 

 Aiiipliillinr Kilsfioni, Kathke, Acta Acad. Loop. T. XX, p. 264. 

 Syn : Ampldthne. Prrvnsti, Kathke, 

 ' Orrhcstid nidrofiirnsis, Kriiyer. 



Segments of bodj- not ver\' sharply demarcated from eacli other, the 

 back being quite evenly vatilted. Cejihalon longer than the 1st segment of 

 the mesosome, lateral corners slightly projecting between the bases of the 

 antennae. First pair of coxal plates scarcely smaller than the 3 succeeding 

 ones, the latter somewhat deeper than the liody and rounded infei-iorly, otli 

 pair much lower than the preceding ones, anterior lobe miteli the lai'ger. 



