2362 CRUSTACEA. 



Subfamily II. PANDARIME. 



Pandarus and some other genera are made into a distinct family 

 (" Tribu des Pandariens") by Milne Edwards, on the ground of their 

 having alate dorsal extensions of the shell of the second or second and 

 third segments of the body. This character cannot be of family 

 importance, as is evident from its nature; and besides, it takes place 

 without any striking difference of function or habit. The peculiarity 

 of the maxillae is more important. Moreover, it is connected with a 

 very slender buccal trunk, in which the mandibles are straight or 

 nearly so, and have exit at the apex. On this striking characteristic, 

 we separate some non-alate species from the Caliginae, and unite them 

 to the group of the Pandari. The Caligeriae have the alate pecu- 

 liarity to some extent, yet the trunk and maxillaa are like those of 

 the Caligi. 



Genus NOGAGUS. 



CephalotJiorax k-articulatus, f route arcuatus. Segmento secundo lateri- 

 bus postice producto, sequentibus vix alatis. Oculi simplices remo- 

 tiuscidi (An quoque oculus minutissimus intermedins ?) . Pedes prehen- 

 siles quatuor duobus posticis crassd clieliformibus, digitis brevibus trun- 

 catis (An maris tantum?). Pedes natatorii octo, grandes. Abdomen 

 stylis brevibus sublamellatis setigerisque confectum. 



Cephalothorax four-jointed, arcuate in front; the second segment with 

 the sides prolonged behind, the last two not alate. Eyes simple, a 

 little remote (also, a very minute intermediate eye?). Prehensile 

 ' feet four, the two posterior stout cheliform, the ringers short and 

 truncate (perhaps in the male only) . Natatories eight, large. Abdo- 

 men terminating in a pair of lamellar setigerous stylets. 



The Nogagi have four cephalothoracic segments, instead of three, 

 like Trebius. The individuals examined have the posterior antennas 

 with a simple slender recurved apex, like the female Caligi, and this 

 excited the suspicion that they were females. But the legs of the 

 second pair were very stout and cheliform, having a large hand, and 



