I. '21. 50 



eyes, the antennules, and the large chehped. Males appear 

 to be very much commoner than females. 



The rostrum is fairly prominent and is well rounded off. 

 The lateral processes of the front are well developed and bear 

 a small sharp tooth. The gastric area of the carapace is flatter 

 than in A. laevis ; the hepatic areas bear a few groups of 

 short setae as in the latter species. The posterior part of the 

 c irapace, behind .;the cervical groove, which is very deep, 

 bears many long setae. 



The abdomen is well developed and of the usual form. The 

 telson is similar to that of the species last described and bears 

 four sharp teeth on either side of the recess in the posterior 

 margin. 



The ocular peduncles are much longer and narrower than 

 in A. laevis, and are slightly dilated at the distal end. The 

 cornea is fairly large and is deeply pigmented. The encroach- 

 ment of unpigmented surface on the dorsal part of the cornea 

 is shallow and pointed. The ophthalmic scales are triangular, 

 tapering to a narrow point in front. At the tip each 

 bears a strong spine, which is inserted on the lower surface. 

 The margins of the scales are furnished with setae. The 

 ophthalmic segment is exposed between the scales. There 

 are a very few small groups of setae on the upper and inner 

 surfaces of the eyestalks. 



The peduncles of the antennules are extremely long and 

 slender. When fully extended they are about four times as 

 long as the eyestalks. The third joint is much longer than 

 the first and second combined. On the lower edge of the 

 second and third joints there is a fringe of very long fairly stiff 

 setae ; these two joints are slightly compressed and expand 

 at the distal end. The upper flagellum is of the usual form 

 and is less than half as long as the third peduncular joint. The 

 lower flagellum is about half as long as the upper. The first 

 peduncular joint reaches almost to the tip of the cornea. 



The tooth on the second joint of the antennal peduncle at 

 the inner side of the base of the acicle is very prominent. The 

 external process of the same joint is rather short, reaching only 

 slightly beyond the base of the fourth joint. The acicle is 

 slender and curved, and reaches the middle of the fifth joint ; 

 it bears tufts of long stiff setae on its inner side. There is a 

 small tooth at the distal end of the third joint on the lower 

 surface. All the peduncular joints are more or less setiferous. 

 The flagellum, each joint of which bears several setae, is about 

 three times as long as the carapace. 



The right cheliped is longer than the left and is very much 

 more massive. The merus resembles the same joint in A. laevis, 

 but bears more numerous tufts of setae. There is an irregular 

 row of teeth on the upper inner edge of the carpus, the surface 

 of which is covered with minute granules. The hand is oval, 

 the broadest point being at the base of the dactyl, and is very 

 little longer than the carpus. The outer edge is bordered with. 



