l82 



of the chelipeds. Rostrum triangular, projecting- straight and horizontally forward, acute, short 

 hardly reaching beyond the proximal third of the visible part of basal antennular article and 

 almost 4-times as long as broad in the middle. Frontal margin broad, its outer angles slightly 

 projecting forward and terminating in the extra-corneal teeth that reach to the middle of the 

 rostrum; the distance between the acute tips of the rather small, extra-corneal teeth, which 

 are a little directed inward, is 2,5-times as long as the length of the rostrum. In a lateral 

 aspect the rostrum appears about half as high at its base as long. Anteriorly the orbits are 

 quite open, the large, black and distinctly facetted corneae are entirely covered by the carapace, 

 but in a lateral view a small lower part of the corneae extends beyond the lateral margin of 

 the carapace. Pterygostomian angle rounded. Posterior angle of the third and the fourth 

 abdominal pleura rounded, that of the fifth subacute ; pleura of the sixth somite small, acute, 

 articulate and movable. Telson much tapering backward, width of the posterior margin one- 

 fifth the length of the telson, proportion bietween the width at the base and that of the 

 posterior margin 2,2 ; posterior margin rather much prominent in the middle, outer angles 

 acute, not prominent. The longer, internal spinules are nearly as long as the posterior margin 

 is wide, the outer are hardly half as long, but still project beyond the rounded, median 

 part of the margin. The spinules of the upper surface are just half as long as the longer inner 

 spinules of the posterior margin ; the anterior pair is situated immediately before the middle 

 of the telson, the posterior pair a little farther distant from the anterior pair as from the 

 posterior margin. 



Antennular peduncle slender, second joint twice as long as thick and as long as the 

 visible part of the first, third joint two-thirds the second. Undivided part of outer flagellum 

 composed of f o u r articles, the first as long as thick, the second somewhat shorter, two-thirds 

 of the first, one and a half as thick as long, third a little longer than the second, fourth as 

 long as the first •, olfactory setae well-developed. Stylocerite acuminate, extending until to the 

 2°<^ fourth part of median antennular article. 



Basicerite unarmed, carpocerite slender, 6-times as long as thick and as long as 

 the antennular peduncle, flagellum slender. Scale narrow, just reaching beyond the second 

 antennular article, its outer margin straight, terminal spine small, twice as long as broad at 

 its base, and reaching to the 2°"^ third part of the third antennular article. 



The chelipeds, equal to one another as regards their size and their shape, are directed 

 straight forward, projecting by the whole length of their chelae beyond the rostrum ; they are 

 about half as long as the body. 



The small and feeble merus is 1,75 mm. long, rather slender, 4-times as long as its 

 outer surface is wide at the truncate, distal margin, and gradually thickens from the proximal to 

 the distal extremity; the lower face is slightly concave and both the upper and the lower margin 

 are unarmed and obtuse at apex. The carpus is short, cyathiform, anteriorly widely emarginate 

 at each side; the anterior margin of the upper surface is slightly concave and terminates at its 

 outer angle in an acuminate spine, that is a Httle directed outward, while the inner angle is 

 obtuse; there is also an acute tooth at the inner angle of the lower surface. Like in Betaeus 

 Harfordi Kingsley, the chelae are altogether inverted, the dactylus being placed at the 



5° 



