373 



shorter than the palm; the dactylus is, however, distinctly ridged longitudinally above, from 

 the articulation to the tip. The palm bears no trace of a transverse groove near the articulation 

 of the fingers, but the teeth at either side of the articulation are present, like in the male, 

 and the inner (upper) surface of the chela is also hairy. The large chela fully agrees with 

 Coutiere's figure 274, p. 226, 1. c. 



In an adult, ova-bearing female from Stat. 131 the carpal segments of the 2°<i legs are 

 respectively 1,5 mm., 1,68 mm., 0,6 mm., 0,6 mm. and 0,86 mm. long; the chela is 1,34 mm. 

 long and the fingers are one and a half as long as the palm. 



In the 3"^ and 4''' legs one observes a movable spine near the proximal extremity of 

 the lower border of the ischium; the merus bears a strong, subapical, acute tooth on the lower 

 margin and the lower margin of the carpus ends in two acute teeth, of which the outer is 

 broader but shorter than the other. Propodus of y^ pair 6-times as long as broad, with 7 

 spines on the lower margin, another row of 6 spines close to the former on the outer side 

 and also a spine at the far end of the upper margin. Dactylus slender, tapering, measuring 

 one-third the length of the propodus. 



General distribution: Asiatic seas (H. Milne-Edwards)-; Amboina (Zehntner). 



729. Alphcus praedator de Man. 



J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 103. 



Stat. 181. September 5/1 1. Ambon. Reef, i specimen. 



A new species of the Insignis subgroup, closely related to A. bidens (Oliv.) = tridentatus 

 Zehntner. The single specimen collected is 14mm. long; it is perhaps a young female, because 

 the fingers of the small chela are not Baiacniccps-s\-\3i]i&A^ while this is the case in the male 



. of the closely allied A. bidcns. 



Rostrum pointed, acute, narrow, half as broad at its base as it is long, slighdy directed 

 upward and reaching to the middle of 2°'^ antennular ardcle. As in A. bidens, the rostral carina 

 Is interrupted at the anterior third of the carapace (rostrum excluded); the interorbital pordon, 

 pardy concealed by the eye-hoods from which it is separated by deep grooves, half as broad 

 as the corneae, is strongly compressed, sharp-edged and, differently from A. bidcns^ arises, between 

 the posterior end of the corneae and the interruption, as a high, arcuate crest. Immediately 

 behind the interruption one observes an obtuse tubercle like in A. bidcns and this tubercle is 

 prolonged, in the mid-line of the carapace, into a straight obtuse crest, that extends to 

 the posterior third of the carapace (rostrum excluded); this crest is bounded at either 

 side by a shallow groove or depression, which also ends abruptly at the posterior 

 extremity of the crest, so that the latter shows the same height along its whole length. 

 Viewed at from above the crest appears thicker than that part of the rostral carina, which is 

 situated in front of the interruption. Just as in A. bidens, one observes, at either side of the 

 rostral carina, between the corneae and the median tubercle, a pointed tooth, broad and 



■ flattened at its base, the acuminate tip of which is slightly directed inward; the sharp-edged, 

 concave, inner margin of these teeth extends to a little behind the median tubercle, but the 



241 



SIEOGA-EXPEDITIE XXXlXi;'. 4° 



