CANCROIDEA. 275 



rior portion of inner episternal suture, the anterior portion, which 

 properly extends to the margin of the plate just inside of the base of 

 the outer antennse, being obsolete. 



Maui, Sandwich Islands. 



Length of carapax, one inch and one line ; breadth between tips 

 of larger lateral teeth, one inch and eight lines; ratio of length to 

 this breadth, 1:1*6; breadth between teeth next anterior, one inch 

 six and three-fourths lines ; ratio of length to this breadth, 1 : 1*44. 

 It is thus seen that this is a peculiarly narrow species. A faint line 

 (as seen on the bare carapax) extends from the larger lateral tooth to 

 the anterior outer angle of the intra-medial areolet (3 M), which areo- 

 let is faintly brought out. The inner spine of the carpus is long and 

 slender. The four teeth of the front are in pairs, and truncate. The 

 orbital margin below the antennse has a broad, rounded projection. 



Genus AMPHITEITB (Be Saan), Dana. 



Antennis extends Lupge similis. Carapax angustus, subhexagonus, inar- 

 ginibus frontali antero-lateralique angulo convenientibiis, antero-late- 

 rali raro breviore quam postero-lateralis. Ocidi breves, grandes, in 

 orbitis non omnino occulti. Manus elongata, subtrigona. Pedes 8 

 jpostici graciles. 



Carapax narrow, subhexagonal, the frontal margin forming an angle 

 with the anterolateral, the antero-lateral rarely shorter than the 

 postero-lateral. Eyes short and large, and when retracted not con- 

 cealed by the orbits. Hand elongate, subtrigonal. Eight posterior 

 feet slender. 



In Amphitrite, the areas of the carapax are often quite prominent. 

 The large eyes having a staring look. The species may have the 

 posterior tooth of the lateral margin like the others, or elongated into 

 a spine. In two species of the latter kind, described beyond, the front 

 is four-toothed, with the two inner teeth quite small. In a species of 

 the former kind, the front is five-toothed. 



