﻿108 



ALPHEUS SIBOGAE. 



carapace and presentiDg, a little posterior to the orbital 

 iioods, a small obtuse tubercle or prominence. Orbits rounded, 

 unarmed. Telson narrow, twice as long as broad anteriorly. 



Second joint of antennular peduncle slender, 4-times 

 as long as thick, one third longer than the visible part 

 of 1st joint. Carpocerite and scaphocerite as long as antennu- 

 lar peduncle, scaphocerite narrow, 4-times as long as broad, 

 its outer margin concave. 



Meropodite of larger chelipede of the male 3-times as 

 long as broad, upper margin coarsely denticulate or tuber- 

 culate along its whole length, unarmed at extremity, infero- 

 internal margin with 4 acicular spinules and terminating 

 in an acute tooth. Chela turned outward, 3-times as long 

 as high, and about half as thick as high ; upper margin 

 of the palm, which is almost 3-times as long as the fingers, 

 rounded, without a transverse groove ; outer surface with 

 a moderately deep groove, rather broad in the middle, 

 narrow proximally, extending from the carpal articulation 

 to the fingers and bounded inferiorly by a ridge that runs 

 parallel with the rounded lower margin of the palm. 



Palm of smaller chelipede of the male hardly longer 

 than the fingers, of the female a little shorter than the 

 fingers, 3-times as long as high ; upper border of the 

 palm without a transverse groove, outer surface in the 

 male with a shallow groove extending on its lower half 

 from the carpal articulation to the fingers. Dactylus in the 

 male Balaeiiiceps-shai^ed^ presenting a spoon-like shape 

 when looked at from above; in the female the fingers are 

 slender, tapering and shutting together. 



Carpus of legs slender, joint one fourth or one 

 fifth longer than 1st, 4th joint slightly longer than the 

 B^d and the that are subequal. 



Meropodite of 3^^ legs unarmed, slender, 8 — 9-times as 

 long as broad; carpus slender, propodite one fourth longer 

 than carpus, straight, not narrowing distally ; dactylus two 

 fifths of the propodite, slightly arcuate, not broader 

 than high. 



Notes from tlae Leyden !]^luseum, "Vol. XXX. 



