109 



a well (lelined concaved palmar edge, dactylus strong and curved. Pereiopoda 

 comparatively slender, basal joint of the 3 posterior pairs large and laminar. 

 IJrancliial lamellfB simple. Last pair of uropoda mncii larger tlian in Onesi- 

 jw^i' and reaching considerably beyond the preceding pair, both rami partly 

 setons on the inner edge. Telson oblong and deeply cleft. 



Remarls. — The present new genus is intermediate in character 1)e- 

 tween the genera Onesiimis and Anonyx, resembling the fonner in the general 

 forni of the bodv, the latter in the structure of the oral parts and caudal 

 appendages. From both it is markedly distinguished by the peculiar power- 

 ful structure of the posterior gnathopoda, a character which has given rise 

 to the generic title here proposed. It may be observed that two of 

 the species described hy Dr. Hansen from the Kara Sea and referred by him 

 to the genus Onesimus exhibit a (^uite similar structure of these limits, a 

 fact which would seem to indicate a closer relation to the present genus. 



49. Chironesimus Debruynii, (Hoek). 



(PI. 37, fig. 2). 



Anowj.r Debruynii, Hoek, Die Crustaceen gesatnmelt wahreud der Fahrten der »^Villeln Ba. 



rentsj. Niederl. Aveh. fur Zoologt. Suppl. Bd. 1, p. 44, PI. Ill, fig. 30. 



Body rather robust and tumid, with broadly rounded back. Cephalon 

 about the length of the 1st segment of mesosome, lateral corners somewhat 

 produced and narrowly rounded at the tip. Anterior coxal plates fully twice 

 as deep as the body; 1st pair scarcely expanded below^ 4th pair deeply emargi- 

 nated posteriorly and forming below the emargination a rather large angular 

 expansion; 5th pair not very large, more broad than deejj. Last pair of epi- 

 meral plates of metasome produced at the lateral corners to an acute trian- 

 gular, somewhat upturned lobe. First segment of urosome but .slightly de- 

 pressed dorsally. Eyes oblong oval, a little broader below, pigment red. 

 Superior antennae about the length of the cephalon and the 2 first segments 

 of mesosome combined; 1st joint of the peduncle very large and thick; flagel- 

 lum exceeding the peduncle by about V* of its length and composed of about 

 11 articulations, the 1st of which equals in length the 3 succeeding ones 

 combined; accessory appendage abcnit half the length of the flagellum and 

 6-articulate, 1st joint being very large and some^vhat expanded. Inferior antennae 

 a little longer than the superior, the 2 outer peduncular joints nearly of 

 uniform length, flagellum composed of about 15 articulations. Anterior gna- 

 thopoda with the propodos scarcely as long as the carpus and much narrower, 

 palmar edge .slightly concaved and detined below ahnost rectangularly. 



15 — Crustacea. 



