100 



This variety differs from the typical species by the carpal 

 joints of the longer 2üd leg presentiug a more slender shape 

 and by the carpus of the 3rd (and 4th) legs appearing also a 

 little more sleuder and longer with regard to the propodite. So 

 e. g. the 4th carpal segment of the longer leg appears 5 — 5,6-tiraes 

 as long as thick, in the typical species, however, 3,4 — 3,9-times. 

 Meropodite of 3rd legs 4,3 — 4,5-times longer than wide, in the 

 typical form 3,7 — 4-times; carpus 5,6 — 5,8-times as long as thick 

 in the middle, in the typical species 4,4 — 5-times; carpus 1,33 — 

 l,35-time8 longer than the propodite, in the typical species 1,25-times. 



2. Alpheus Arethusa, n. sp. 



Station 60. Haingsisi, Samau Island, Timor. Depth 36 M. 



A new species of the group „cnwi^ws" s. «., closely allied to 

 A. styliceps Cout. Frontal margin as in this species, but the 

 rostrum much less prominent and, at either side of it, the frontal 

 margin somewhat less oblique; interorbital cariua narrow, conti- 

 nued almost to the middle of the carapace and separated by 

 shallow grooves, wider than in A . styliceps, from the orbital hoods. 

 In the male the pleura of the Ith — 4th abdominal somites are 

 spiniform, those of the two followiug acute, posterior margin of 

 6th somite with acute tooth in the middle and with another also 

 acute, but twice as large, at the outer angles. Telson in the male 

 3,5, in the female 3,7-times as long as the a little prominent, 

 posterior margin is wide, greatest width in proportion to the 

 posterior margin as 11:6. 



Anten nal and antennular peduncles as in A. styliceps, but the 

 stylocerite a little shorter and the narrow scale of scaphocerite 

 reaching to the extremity of median antennular article. 



Large chela as in A. ovaliceps Cout., small chela as in A. 

 styliceps, but the fingers slightly shorter, the fingers being in 

 proportion to the palm, in the male as 4 : 3, in the female as 14 : 11. 



Second legs nearly as in A. styliceps. Meropodite of 3rd legs 

 in the male 3,9-times, in the female 4,1-times as long as wide 

 in the middle, with a tolerably stroug, acute tooth at the distal 



