529_ 



walli of Rathke. As pointed out by Boeck, the Cheirocratus mantis of Nor- 

 man is undoubtedly identical with this species. In the male sex, it is easily 

 distinguishable from any of the other species by the peculiar shape of the 

 posterior gnathopoda, and the strong development of the last pair of pereio- 

 poda. The female, however, is very like that of the other species, and only 

 by a minute examination determinable. 



Occurrence. I have met with this form occasionally in several 

 localities of the west coast of Norway, in moderate depths. According to 

 Boeck, it also occurs off the south coast, at Mandal. 



Distribution. British Isles (Norman), Bohuslan (Bruzelius), Kattegat 

 (Meinert), coast of France (Chevreux). 



Gen. 11. Lilljeborgia, Sp. Bate, 1862. 



Syn: Iduna, Boeck. 



Microplax, Lilljeborg. 

 Phaedra, Sp Bate (part). 



Body, as a rule, not very slender, with the coxal plates of moderate 

 size; 1st pair more or less expanded; 4th pair the largest, and distinctly 

 emarginated in their upper part. Cephalon comparatively small, and slightly 

 produced in front, lateral corners somewhat projecting. Eyes distinct, or 

 wanting. Antennae not very much elongated, the superior ones, as a rule, shorter 

 than the inferior, and having the last 2 joints of the peduncle very small, 

 flagellum strong and curved, accessory appendage very fully developed. 

 Anterior lip slightly bilobed at the tip, and exhibiting in front an obtuse 

 protuberance; posterior lip without any inner lobes. Mandibles not 

 very strong, molar expansion poorly developed, forming .only a small 

 tubercle clothed with slender diverging spines, palp comparatively small and 

 narrow, with the terminal joint much shorter than the middle one. First 

 pair of maxillae rather small, palp with the terminal joint more or less 

 expanded, basal lobe minute, with only a single bristle. Second pair of 

 maxillae with the lobes short, the outer being narrower than the inner. 

 Maxillipeds having the palps very large and pediform, basal and masticatory 

 lobes poorly developed. Gnathopoda powerfully developed, with large, sub- 

 cheliform hands, and the dactylus, to a greater or less extent, coarsely serrate 

 inside, the posterior ones somewhat larger than the anterior, and far more 

 strongly developed in male than in female. The 2 anterior pairs of 

 pereiopoda very slender and feeble in structure, the 3 posterior pairs rapidly 



