Ill 



especially the 3 posterior pairs, the joints of which are in parts much expanded. 

 Last jjair of uropoda extremely small, with the rami quite naked. Telson 

 short and l)r<)ad, I'ounded, .slightly incised posteriorly. 



llemarlcs. — ■ The present genus has been established by Boeck in 

 order to include a form which, though resemlding the sjjecies of Onesinms in 

 its outer habitus, jet exhibits considerable difference in certain characters of 

 apparently generic value, thus in the structure of the oral parts and in that 

 of the anterior gnathopoda. It contains as 3'et but a single species. 



50. Menigrates obtusifrons, Boeck. 



(,P1. 38, tig. 1.) 

 Anoiiyx obtusifrons, Boeck. Forliandl. ved de Skand. Nutiirf. 8de Mode 1860, p. 043. 

 Syn ■ Anony.K lirachycercus, Lilljeborg. 

 » Aiionyx plaiitus, Sp. Bate (not Kioyer). 



Body very robust and much tumeficated, with broadly vaulted back, 

 f 'ephalon shorter than the 1st segment of mesosome, lateral corners somewhat 

 produced and angular at the tip. Anterior coxal plates nearly twice as deep 

 as tlie l)ody and successively increasing in size posteriori}'; 4th pair but 

 slightly expanded in their lower part; otli pair rather large, about as deep 

 as lu'oad, and produced at the infero-posterior corners to a short detlexed lobe. 

 Last pair of epimeral plates of metasome drawn out at the lateral corners 

 to a short triangular upturned projection. First segment of urosome scarcelv 

 impressed dorsally. Eyes of moderate size, oval or reniform, pigment red. 

 Superior antennae in female scarcely longer than the cephalon and the 1st 

 segment of mesosome combined; peduncle much tumeticated, with the 2 outer 

 joints very short; flagellum but little longer than the peduncle and composed 

 of 8 articulations only, the 1st of which equals in length the 3 succeeding 

 ones combined ; accessory apjiendage exceeding half the length of the flagellum 

 and 4-articulate, 1st joint by far the largest. Inferior antennte in female 

 scarcely longer than the superior, flagellum 8-ai'ticulate ; in male a little more 

 elongated, with the flagellum, like that of the superior, comjiosed of a greater 

 number of articulations. Anterior gnathopoda rather powerful; propodos 

 nearly twice the length of the carpus, somewhat curved and gratlually ta])er- 

 ing distally, dactylus strong and curved. Po.sterior gnathopoda with tlie 

 ]U'i)podos aljoixt half the length of the carpus, oblong oval, scarcel^^ dilated 

 distally. Posterior pereiopoda very short and robust, of much the same 

 appearance as in Onesimus plautu!<, the meral joint being considerably ex- 

 panded and the basal joint, especially of the last ])air, very large. Last pair 

 of uropoda scarcely reaching to the end of the preceding ])air, inner ramus 

 simple lanceolate and a little slun-ter than tlie outer. Telson about as l)roa,d 



