19 



Eyes 0,5 mm. long, l j 7 the length of the carapace, rostrum included, facets rather large r 

 pigment deep black. 



Measured from the orbital margin of the carapace, the basal segment (Fig. 10) of the 

 antennular peduncle proved to be 0,74 mm. long, one-fourth longer than the 2 nd and 3 rd taken 

 together; longitudinal crest with terminal spine on the infero-internal margin as in A.polymorphus; 

 the 2 Dd segment, 0,26 mm. long and 0,29 mm. broad, little broader than long, measures 

 one-third of the i st , the 3 rd , finally, 0,35 mm. long and 0,26 mm. broad, is one-third 

 longer than the 2 nd , but a trifle less broad. The fused part of the outer antennular ramus, 

 0,4 or 0,42 mm. long, is nearly as long as the 3 rd segment of the peduncle and composed 

 of three joints of which the i st or proximal appears as long as the tvvo following that are sub- 

 equal, taken together, the 3 rd being only a trifle longer than the 2 nd ; the thicker one of the two 

 branches, the olfactory filaments of which are well developed, is nearly as long as the fused 

 part, while the other branch is much longer; the inner antennular ramus is considerably longer. 

 Stylocerite large, acuminate, reaching almost to the middle of 3 vd antennular article, outer margin 

 slightly curved. The statocysts are in communication with the exterior by a wide aperture on 

 the postero-external part of the upper surface of the basal segment and I observed in each a 

 black rounded partiele; both particles are of the same size, 0,08 mm. broad, and apparently 

 act as statoliths. The two statoliths being of the same form, size and colour, it appears im- 

 probable, that they have been introduced by the animal, but I do not venture to give any 

 opinion about their origin. 



Second segment of antennal peduncle with a spine at the infero-external angle that 

 reaches to the distal margin of the i st joint of the antennular peduncle, carpocerite as long 

 as this peduncle; scaphocerite 0,96 mm. long, 0,54 mm. broad, almost twice as long as broad 

 and a little longer than the antennular peduncle, outer margin straight, terminal spine reaching 

 a. little beyond the rounded tip of the lamella. 



The outer maxillipeds reach to the distal extremity of the antennular peduncle, the 

 terminal joint is twice as long, but not stouter than the penultimate. 



The peraeopods of the i st pair (Fig. ic«$, ior) are very nearly equal and project by the chela 

 and half the carpus beyond the antennal scale. Merus of the right leg one and a half, that 

 of the left one and one-third as long as the ischium and 6-times as long as broad; carpus 

 slightly shorter than merus, the proportion being like 15 : 17, and 5-times as long as 

 thick at the distal end; chela but a trifle shorter than carpus, fingers measuring 

 three-fifths of the palm. Except the usual tufts of setae on the fingers these legs appear 

 nearly glabrous, the few setae that one observes on the joint being extremely short and fine. 



The peraeopods of the 2 nd pair (Fig. iot/) are also equal or very nearly so. Carpus composed 

 ■of five segments, nearly one and a half as long as the merus ; the i st segment as long as the 

 four following together and a little more than 6-times as long as thick at the distal extremity ; 

 the three following joints are equal or very nearly so and a trifle less broad than long; 5 th segment 

 a trifle longer than the two preceding taken together and almost 3-times as long as thick ; 

 chela measuring about one-third the length of the carpus, fingers of the right leg a trifle longer, 

 of the left a trifle shorter than the palm. 



