den. 3. Hyale, Rathke, 1*37. 

 Syn : AUnri-hestes, Dana = <j<, 

 Nicca, Nicolet = Q. 



Body greatly compressed, but with the back rounded. The 4 anterior 

 pairs of coxal plates rather deep and subequale in size, the 3 posterior ones 

 much lower. Superior antennae longer than the peduncle 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 preceding genera, saving that the 

 1st pair of maxillae has a distinct though very small and narrow palp, and 

 that the palp of the maxillipeds consists of the normal number of joints. 

 Both pairs of gnathopoda subcheliform, in female nearly subequal, in male 

 very unequal, the posterior ones being much stronger and terminating with a very 

 large and powerful hand. Branchial lamellae of normal structure, though 

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

 densely ciliated. Pleopoda somewhat larger than in the 2 preceding genera 

 and having the natatory setae plumose. Uropoda about as in Orchestia. 

 Telson small, unarmed, cleft to the base. 



Jim/ark*. It is evident that Boeek was right in uniting the two 

 genera Allorchestes Dana and Nicca Xicolet, as only founded on sexual cha- 

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

 ]{;i<il<' 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 numerous 

 species occurring, it would seem, in all parts of the world. Two distinct 

 species belong to the Norwegian fauna. 



3. Hyale Nilssoni, i Rathke). 

 (Pi 11, fig i). 



Ampliitlinc Nilssoni, liathke, Acta Acad. Lcop. T. XX, p. 264. 



Syn: Atitjihitline PrrroKti, Kathke, 



OrcJicstifi iiitlroH/DiK/x, Kroyer. 



Segments of body not very sharply demarcated from each other, the 

 back being quite evenly vaulted. Cephalon longer than the 1st segment of 

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

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

 ones, the latter somewhat deeper than the body and rounded inferioiiy, f>th 

 pair much lower than the preceding ones, anterior lobe much the larger. 



