232 



Gen. 6. Stegoplax, GK 0. Sars, 1882. 



Body short and stout, with rather firm integuments. Cephalon 

 produced in front to a large acuminate rostrum. The 2 first pairs of coxal 

 plates quite rudimentary, 3rd and 4th pairs largely developed, the latter 

 pair deeply emarginated in their upper part. Metasome not very powerful. 

 Antennae comparatively small, the superior ones simple, without any secondary 

 appendage. Epistome produced in front to a rounded lamellar projection. 

 Anterior lip about as in Gitana; posterior lip with the lateral lobes simple, 

 without any incision inside. Mandibles strong, with the molar expansion 

 large and protruding, palp comparatively small. First pair of maxillae with the 

 palp uniarticulate ; 2nd pair with the lobes rather narrow, and but sparingly 

 setous. Maxillipeds well-developed, basal lobes rather large, masticatory 

 lobes much smaller, and scarcely projecting beyond the 1st joint of the palp, 

 the latter robust, and but sparingly setous. Grnathopoda subequal, not very 

 strong, and imperfectly subcheliform. Pereiopoda slender, basal joint of the 

 antepenultimate pair linear, that of the 2 last pairs laminarly dilated. 

 Uropoda and telson nearly of same structure as in the 4 preceding genera. 



Remarks. The present genus is apparently nearly allied to the 

 genus Cyproidia of Hasswell, as recently redescribed by the Rev. Mr. Stebbing, 

 though materially differing by the large rostral projection, the want of any 

 accessory appendage to the superior antennae, and the different structure 

 of the gnathopoda. Moreover the structure of the uropoda and telson is 

 very deviating in the two genera. I have had an opportunity of examining 

 a Mediterranean species, evidently congeneric with the British form described 

 by Mr. Stebbing, and cannot, by any means, bring this form within the same 

 genus as the species described below. 



12. Stegoplax longirostris, G. 0. Sars. 



(PI. 79, fig. 2). 

 Stegoplax lonyiroxtns, G. O. .Sars, Oversigt over Norges Crustaceer I p. 88, PI 3, fig. 11. 



Body of very short and compact form, and quite smooth, with the 

 back evenly vaulted. Cephalon about the length of the first 3 segments 

 of mesosome combined, rostrum very long and acuminate, but very slightly 

 curved, and reaching nearly to the end of the superior antennae. First and 

 2nd pairs of coxal plates extremely small, subequal in appearance and 

 almost completely covered by the 3rd pair, the latter very large, and 



