36i 



broad anteriorly, its posterior margin i mm. broad and in the adult female from Stat. 315 

 these numbers are 2,28 mm., 1,32 mm. and 0,84 mm.; in the small egg-bearing female from 

 the same station, long 8,5 mm., the telson is still narrower posteriorly, being 1,22 mm. long, 

 0,68 mm. broad anteriorly and 0,36 mm. at the posterior margin. Endopod of caudal fan armed 

 on its outer and posterior margin with about 30 spinules, those on the outer margin being 

 larger. Posterior margin of the telson with 20 feathered setae between the outer angles. 



Penultimate joint of external maxillipeds one and a half as long as thick; terminal joint 

 twice as long as the penultimate and about 3-times as long as broad. 



Chelae of both legs of i^' pair turned outward, the dactylus being situated on the 

 outer side and even a little obliquely directed downward. Merus of the large cheliped of the 

 adult male one and a half as long as broad; the slightly arcuate, upper margin ends in 

 a subacute tooth, while the inner margin bears an acute tooth near the far end, which 

 tooth is wanting in A. biucphalus^ in both chelipeds the ischium ends in a large prominence, 

 which in a lateral aspect appears acute. Chela resembling that of A. ducepka/us, the fingers 

 measuring also one-third of its length, but, measured in the plane of the fingers, the palm appears 

 a little less high than in Coutiere's figure 29^?, the length of the palm being in proportion 

 to its height as 5:3; dactylus obtuse, immobile finger pointed. Inner (upper) face of the 

 immobile finger and the contiguous part of the palm hairy, in a less degree also the outer 

 (lower) side of the immobile finger. The prominence at the lower margin of the ischium of the 

 large chelijsed is more acute in the female than in the male ; the merus is nearly twice as 

 long as broad and the subapical tooth on the inner margin resembles that of the male. Chela 

 considerably smaller than in the male, little more than half as long; its form is 

 also different, for it seems to narrow more considerably towards the fingers, when looked at in 

 the plane of the latter, so that the lower margin of the chela appears more strongly arcuate. 

 Palm and immobile finger are nearly glabrous, except on its cutting-edge. 



The merus of the smaller cheliped of the male from Stat. 78 is a little broader than 

 that of A. clypeahcs, its outer face one and a half as long (2,6 mm.) as broad (1,6 mm.). The 

 somewhat arcuate upper margin ends in a subacute angle, when the outer face is looked at ; 

 the inner margin is unarmed. Carpus short as in A. clypcatus^ nearly as long as the anterior 

 margin of its upper surface is broad; a small tooth near the middle of this margin. The chela 

 which is 4,5 mm. long and much resembles that of x4. c/ypcatiis, is but little more than halt 

 as long as the large chela; measured in the plane of the fingers, i.e. on the inner (upper) 

 surface, the chela appears 3-times as long as broad (high). Fingers slightly longer than 

 the palm; dactylus situated on the outer side and much broadened, being half as 

 broad as long; the upper (outer) face, which is slightly convex both longitudinally and 

 transversely, narrows from the middle of the finger to the pointed tip, that is slightly curved 

 inward. Along the edge that makes the inner (upper) face of the dactylus with the upper (outer) 

 one, the finger is thickly fringed with long hairs from the base to near the tip; the somewhat 

 flattened, inner (upper) face of the palm and of the immobile finger, which is straight and a 

 little broader, at the inner (upper) side, than the dactylus, is also covered with long hairs. 



Unfortunately only one adult female carries the small cheliped, namely that from Stat. 3 i 5. 



229 



