CRUSTACEA. 



but having a few tubercles; lateral margin strongly seven-toothed; 

 teeth spimform, two posterior smaller and subdorsal. Anterior feet 

 of moderate size; arm and earpus spinulous; eight posterior with a 

 spiniform tooth at apex of third joint. Outer antennae often partly 

 concealed by the beak; second and third joints subequal, hardly 

 reaching to furcation at apex of either horn. Lower orbital margin 

 one-toothed. Pterygostomian region spinulous or pustulate. 



Plate 2, fig. 4 a, male of a specimen from the East Indies, natural 

 size ; b, under view of head. 



Balabac Passage, north of Borneo; also from Peru? 



Length of carapax of specimen from Balabac Passage, one inch; 

 greatest breadth, ten lines; hand, six and a half lines long, or a little 

 more than half the length of the carapax. 



Length of the supposed South American specimen, three inches and 

 two lines ; same, excluding beak, two inches and seven lines ; breadth 

 across from tip to tip of sixth lateral spine, two inches and nine 

 lines; breadth across, excluding these spines, two inches two lines. 

 Length of longest lateral spines, nearly half an inch. 



Below the outer spine on the margin of the orbital cavity there is 

 an obtuse spine, and another exists on the surface, between the upper 

 angle of the buccal area and the second tooth of the margin of the 

 carapax. Outer maxillipeds and surface adjoining granulous. Poste- 

 rior margin of carapax nearly straight, and with a small, prominent 

 tubercle or spine at each angle ; also a small spine or tubercle on the 

 intestinal region. 



Subfamily CYCLACIN.E. 

 Genus CYCLAX. 



Suborbicularis, paido armatus, rostra parvulo, furcato, mm lamellate. 



Oculi prcelongi, reiractiles, orbltls obUqw-tmmver«i* &phid externo- 



posticd longd, anticd parvuld. Antenna externa rostro remote, longm, 



articulo primo aplce U-spinoso, spina externa lottgd. Fonsce onto,- 



