447_ 



and successively increasing to the 4th pair, which are much the largest, and 

 distinctly emarginated in their upper part posteriorly. Eyes well developed, 

 being much larger in male than in female. Antennae not very slender, and 

 subequal in length, both having the flagella divided into numerous short and 

 very sharply defined articulations carrying posteriorly large calceolse, last 

 peduncular joint of the superior ones produced at the end posteriorly to a 

 triangular lappet, which is likewise provided with a number of distinct 

 calceolse, accessory appendage wanting. Antennae in male scarcely at all 

 differing from those in female. Oral parts resembling those in the genus 

 Aphernsa, except that the mandibular palps are comparatively larger, with 

 the terminal joint fully as long as the 2nd. Gnathopoda much more power- 

 fully developed than in that genus, carpus quite short, and produced below 

 to a setiferous lobe, propodos very large, with the palm occupying the greater 

 part of its length, and imperfectly denned. Pereiopoda more or less strongly 

 built, the 3 posterior pairs successively somewhat increasing in length, and 

 having the basal joint moderately expanded. Last pair of uropoda scarcely 

 reaching beyond the others, basal part comparatively short, rami subequal 

 and lanceolate* in form, being edged with small spinules, and partly also with 

 ciliated setae. Telson quite unarmed, linguiform in shape, and not incised or 

 dentated at the tip. 



Remarks. This genus was established by Sp. Bate in the year 



1855, but as the generic name he proposed, Calliope, was already appropriated 

 in Zoology, it was changed in the year 1865 by Prof. Lilljeborg to CaUk^'n^. 

 The genus is chiefly distinguished from the '2 preceding ones by the com- 

 paratively less slender and subequal antennae, (which, moreover, do not show 

 any perceptible difference in the 2 sexes, being in both provided with well- 

 developed calceolae), further, by the comparatively much stronger development 

 of the gnathopoda, and finally, by the structure of the last pair of uropoda 

 and the telson. It comprises as yet but 2 species, which, however, by most 

 authors, have been confounded with each other. 



8. Calliopius Rathkei (Zaddach). 



(PI. 157, fig. 2). 

 c Rathkei, Zaddach, Synops. Crust. Pruss. prodrom. p. fi. 



Syn. : Calliope grandoculis Sp. Bate (male). 

 Calliopius Iseviusculus, autorum (part). 



Body comparatively stout and somewhat tumid in its anterior 

 part, with the segments rather sharply defined. Cephalon fully as long as 



