MEGALOPIDEA. 495 



terior part of cephalo thorax below ; c, anterior leg ; d, posterior 

 tarsus. 



Sooloo Sea. 



Length of carapax, one and a half lines. The long spines at the 

 posterior part of the thorax below start from the medial line, and are 

 widely divergent, being seen projecting either side of the base of the 

 abdomen. The tarsus of the posterior pair of legs is rather narrower 

 than in the hyalina. The upper margin of the carapax behind is not 

 armed. The hand is oblong, and not much inflated. 



GENUS TRIBOLA, Dana. 



Carapax fronte fere horizontalis, tricuspidatus, rostro (vel cuspide medi- 

 and) cuspidibiis externis vix longiore et supra sulcato. Antennae 

 internee inter rostrum et cuspides externas aperte inflexce. Pedes 

 postici parce minores, tarsi styliformi infra armato, setis longis non 

 instructo. 



Carapax in frpnt nearly horizontal, tricuspidate ; beak (or middle 

 cusp) hardly longer than the cusps either side, and sulcate above. 

 Inner antennae, when flexed, exposed in the interval between the 

 beak and the cusps adjoining. Posterior feet little smaller, tarsus 

 styliform and armed with spines below, not furnished with long 

 setae. 



TRIBOLA LATA. 



Carapax late ovatus, paulo longior quam latus, rostro et cuspidibus 

 externis fere remotis, his apice acutls et paulo divaricatis, 'marginibus 

 pone oculos parce undulatis. Pedes antici tenues, manu pedibus 

 sequentibus vix crassiore. 



Carapax broad ovate, a little longer than broad, intervals either side 

 of beak quite broad (nearly as broad as long) ; lateral cusps acute, 

 a little divaricate at apex. Margin behind eyes a little undulate. 

 Anterior feet slender, hand hardly stouter than the following legs. 



