325 



c^ Rostral carina? Larger chela of the male 2,46-times as long as 

 high. Fingers of smaller chela of the male 1,33-times as long as 

 the palm, gaping, fringed with long setae, but not excavate at 

 the inner side; dactylus not "Balaeniceps"-shaped. Second carpal 



article of 2^^ legs twice as long as i^^ rapax Cout. ^) 



(H. COUTIERE, Alpheidae Maid, and Laccad. Archip. 1905, p. 905). 



b.^ Palm of smaller chela of the male 3- or more than 3-times as long as high. 



c^ Rostral carina sharp, continued to just behind the middle of the 

 carapace and bearing, a little posterior to the orbital hoods, a 

 small obtuse tubercle or prominence. Large chela of the male 

 3-times as long as high, palm almost 3-times as long as the 

 fingers. Smaller chela of the male with the palm 3-times as long 

 as high and hardly longer than the fingers, dactylus "Balaeniceps"'- 

 shaped Sibogae de Man 



fj Rostral carina prominent and sharp, extending almost to the posterior 

 third of the carapace and bearing, just behind the orbital hoods, 

 a small, obtuse tubercle or tooth. Larger chela of the male slender, 

 6-times longer than high, fingers slender, measuring three-fifths 

 of the palm. Smaller chela of the male 9-times longer than high, 

 palm a little longer than the fingers, dactylus "Balaeniceps"- 

 shaped acutocarinaUis de Man 



C3 Rostral carina not continued backward beyond the base of the 

 orbital hoods. Larger chela with the palm slender, subcylindrical, 

 and gently tapering and with the dactylus only about one-third 

 the length of the palm. Smaller chela about 6-times as long as 

 high, with the palm equal in length to the fingers that are shutting 

 together iiiacrosccles Ale. & Anders. 



& 



Edzvardsi group. 



flj Merus of 3''' legs unarmed. 



b^ Dactj'lus of the small chela of the male subspatulate in form,"Balaeniceps"- 

 shaped ; in the female the fingers are slender, straight. 

 c^ Dactyli of three posterior legs simple. 



d^ Rostrum triangular, flattened above, arising from the base of the 

 orbital hoods, from which it is separated by rather deep grooves. 

 c^ Larger chela with the lower margin deeply notched, fingers 

 but a little shorter than the palm. 



l) This species has been, in my opinion, wrongly referred to A. rapax Sp. Bate (Challenger Macrura, p. 552, PI. 99, fig. i), 

 because the fingers of the smaller chela of the male are but one-third longer than the palm and because the length of the carpal articles 

 of the 2"'' legs is also different; Bate's species seems to belong to A. distingiiendus de Man. 



193 



SIBOGA-EXrEDITIE XXXIX (J '. 42 



