CRUSTACEA. 

 120 



Sne of the whole, this part included, elhpbcal Extenor max. - 

 lipeds W ith the third joint subjugular, the outer anterior angle 

 being prolonged outwards much beyond the line oi the outer margin 

 of the second joint, and subacute. 



In the males (with one exception ?) the abdomen is quite narrow; 

 the penult segment is longer than the preceding, and has a low salient 

 angle on its opposite sides. 



Hand of the first pair of legs, with the fingers either in contact 

 throughout, or only at the extremity ; inner margins wholly or partly 

 denticulate; in some males, a broad tooth near articulation. 



Area either side of mouth with the margin bidentate. 



Mexjetiiius axgustcs. 



Carapax sat tuberculatum per any u*tw (fatitwlim mtdto minor* qtum 

 longitudo post-rostral is), denlihu* httrrttlihu* trifnt*, dudws anticU 

 Ulobatis ; rostro longo, emarghmtn; rtyiom medio ud tumidd, /*• 

 Utuberculatd et anterius ared trkuujidotd nutatd ; rrgiotn ffOHt-mediand 

 brevi, unituberculata ; regiont intvxtiuali grand i miitttverctilatd, mar" 

 gine posiico rotundato, integro. 



Carapax tuberculous, epiite narrow (greatest breadth much less than 

 length of post-rostral part ) . lateral teeth three, the two anterior bilo- 

 bate ; beak long, emarginate, medial region tumid posteriorly, having 

 two small tubercles, and just anterior to them an area slightly promi- 

 nent of a triangular shape, post-medial region short, unituber- 

 culate, intestinal region large, with one tubercle, posterior margin 

 of carapax rounded, entire. 



Plate 4, fig. 5 a, carapax, enlarged three diameters; A. under view of 

 mouth, &c, enlarged six diameters. 



Locality doubtful. Expedition collections. 



Length, five and one half lines; greatest breadth, three lines ; length 



