141 



antennular peduncle, the invisible part included. Stylocerite as in the tvvo cited species, as long 

 as basal article. The carpocerite extends beyond the tip of the antennular peduncle by half the 

 length of the third joint. The terminal spine of the scaphocerite reaches to the distal fourth 

 part of the median antennular article, as in Aut. Gardineri (H. Coutière, 1. c. Fig. 127a). 



The telson apparently differs from that of Aut. dolichognatha by the posterior margin 

 being less broad with regard to the length and by the posterior pair of spinules of the upper 

 surface being situated nearer to the anterior pair (vide : J. G. de Man, in : Archiv f. Naturg. 

 53. Jahrg. 1888, Taf. XXII, Fig. 5/). In the other specimens, however, the two pairs of spinules 

 are just as far distant from one another as in that figure of Aut. dolichognatha. The spinules 

 of the posterior pair of the upper surface measure one-ninth, in the specimen from Ambon 

 one-eleventh the length of the telson ; the longer, internal spinules of the posterior margin, 

 which are 4-times as long as the outer, are a little longer than the posterior margin is wide. 



In the larger female from Stat. 19 the merus of the second legs is 10-times as long as 

 wide, in the female, long 10 mm., from Stat. 86, 8,62-times; the slender carpus, which in the 

 female from the west coast of Lombok is 19-times, in that from Stat. 86 18,3-times as long 

 as thick at the distal extremity, appears in the former 1,43-times, in the latter 1,5-times as 

 long as the merus. In the female from Stat. 19 the second segment of the carpus is one- 

 fourth longer than the first and twice as long as the fifth ; the first segment is just twice as 

 long as the fourth, which is the shortest of all, the third one-sixth longer than the fourth and 

 almost as long as the fifth ; the chela measures four-fifths the length of the first segment and 

 the fingers are very little longer than the palm. 



In the female from Stat. 86 the second segment is 1,66-times as long as the first and about 

 twice as long as the fifth; the first 1,75-times as long as the fourth, which is the shortest of all, the 

 third one-fourth longer than the fourth and almost as long as the fifth ; the chela appears in this 

 specimen not shorter, but slightly longer than the first segment, the proportion being as 1,1 : 1. 



These measurements agree fairly well with those of Aut. Gardineri, in which species 

 the fourth segment is described as the shortest of all, the third and the fourth of equal length, 

 while in Aut. dolichognatha the fourth and the fifth are equal and a little shorter than the 

 third. In the other specimens the second legs are missing. 



The measurements of the third legs are mentioned in Table B, unfortunately of Aut. 

 Gardineri the legs of the third and following pairs have not been described. The slender 

 carpus bears a tuft of setae at the distal extremity of both margins and there are also one or 

 two setae at the far end of the anterior margin of the merus. The stout propodus is armed with 

 7 rather strong spinules, the longest of which measure two-thirds the width of the propodus; 

 a tuft of setae at the distal extremity of the anterior margin of this joint are almost as long as 

 the dactylus, which is half as long as the propodus. In the specimen from Ambon the propodus 

 bears also 7 spinules, in that from Stat. 86 six and in both specimens the dactylus is a little 

 more than half as long as the propodus. 



In the ova-bearing female from Stat. 86, long 10 mm., the frontal process appears 

 comparatively longer than in the described specimen, measuring one-third the length of the 

 eye-peduncles ; the latter are not longer, but even a little shorter than the visible part of basal 



9 



SIBOGA-EXPEDITIE XXXIX a'. 19 



