ALPHEUS TENUICARPUS. 



105 



Larger chela of the male 3-times as long as high, half 

 as thick as high, without transverse groove on the upper 

 border, fingers almost half as long as the palm. Meropodite 

 3 , / 2 -times as long as broad, upper margin unarmed, infero- 

 internal margin with 4 spinelets and a small tooth at the 

 end. Fingers of smaller chela in the male just as long, in 

 the female a little ( 1 / 7 ) longer than the palm, which is 3-times 

 as long as high; dactylus in the male Balaeniceps-shaiped. 



Second joint of carpus of 2 nd legs one third longer than 

 1 st joint, the three last joints of equal length, half as long 

 as 1 st ; carpus slender and thin, the 2 nd joint 9-times as 

 long as thick. 



Meropodite of 3 rd legs slender, 8-times as long as 

 broad, unarmed; carpus half as long, propodite 1,2-times 

 as long as carpus, somewhat narrowing towards distal 

 extremity; dactylus half as long as the propodite. 



Length of male 13 mm., of egg-bearing female 13,5 mm. 



8. Alpheus rapacida, n. sp. 



Station 279. Ruma-Kuda-bay, Roma-island. Depth 36 M. 

 Station 313. Anchorage east of Dangar Besar, Saleh- 

 bay. Depth up to 36 M. 



Probably a new species of the group „brevirostris" . Closely 

 related to A. rapax de Haan (nec Fabr.), but distinguished 

 by its much smaller size, the male being 22,5 mm. long, 

 the egg-bearing female 18 mm. 



Rostrum acute, reaching about to the middle of the 

 visible part of 1 st joint of antennular peduncle, continued 

 in a carina, which, rather sharp between the orbital hoods, 

 becomes obtuse behind them, though it may be followed 

 almost to the middle of the carapace. 



Second joint of antennular peduncle which is as long 

 as the carpocerite, little (one fourth) longer than the visible 

 part of the 1 st ; 3 rd joint half as long as second. Scapho- 

 cerite 3-times as long as broad, distinctly longer than the 

 peduncles ; spine on the basicerite small. 



.Notes from tlie Leyclen Museum, Vol. XXX. 



