defined from the anterior lip, both together forming a rounded prominence in 

 front of the buccal area. Posterior lip membranous, with the lobes slightly 

 emarginated at the tip. Mandibles rather strong, the molar expansion nar- 

 rowly truncated at the tip, palp very large and originating a little nearer 

 the tip than does the latter. First pair of maxillae with the masticatory 

 lobe large and obliquely truncated; basal lobe small, bisetose; palp compara- 

 tively short. Second pair of maxillse with the inner lobe only half the length of 

 the outer. Maxillipeds well developed, masticatory lobe oblong oval and not 

 reaching to the end of the antepenultimate joint of the palp, the latter large and 

 robust with the joints rather expanded, terminal joint claw-like. Anterior gnatho- 

 poda unusually strong, propodos considerably expanded and having a dis- 

 tinctly defined palmar edge. Posterior gnathopoda slender, with the propo- 

 dos slightly produced at the tip beneath the small dactylus. Pereiopoda 

 slender and elongate, basal joint of the 3 posterior pairs moderately expanded. 

 Last pair of uropoda reaching considerably beyond the preceding pair, outer 

 ramus setous on the inner edge. Telson short and broad, squamiform, entire. 

 Remarks. It may perhaps be somewhat doubtful whether the form 

 Lysianassa chausica, upon which Milne-Edwards founded his genus Alibrotus, 

 is in fact congeneric with the northern species described in the sequel. But 

 as Sp. Bate believes this to be the case, I have thought it right to adopt the 

 generic name proposed by Milne-Edwards. In my opinion Anoni/.r littoralis of 

 Kroyer cannot, as suggested by Boeck, be referred to the same genus as 

 Anonyx Edn-ardxU and plautns of the said author, and thus the genus Onesi- 

 mns of Boeck may properly be restricted to the two last named Kroyerian 

 species. From that genus the present is chiefly distinguished by the much 

 more elongated and slender antenna?, by the unusually powerful structure of 

 the anterior gnathopoda and by the fuller development of the last pair of 

 uropoda. 



45. Alibrotus littoralis, (Kroyer). 



fPl. 35, fig 2.) 

 Anonyx littoralis, Kroyer, Nat. Tidsskr. 2den Rfekke, Bd. 1, p. 621. 



Body glabrous, curved and rather compressed. Cephalon about the length 

 of the 1st segment of mesosome, lateral corners only slightly projecting and 

 narrowly rounded at the tip. First pair of coxal plates rather large and much 

 expanded distally, anterior and inferior edges forming together an even curve; 

 the 2 succeeding ones much narrower and scarcely twice as deep as the 

 corresponding segments; 4th pair likewise unusually narrow and but very 

 sligthtly expanded in their lower part; f>th pair rounded quadrangular, more 



