406 



besides one or two somewhat larger ones at the distal end; dactylus about half as long as 

 the carpus and about one-third of the propodus. 



The male is 29 mm. long, the female 27 mm. 



General distribution: Japan (de Haan); New Caledonia (Coutière). 



f49. Alpheus öis-incisus de Haan var. variabilis de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 109. 



Confer: Alphens bis-incistts W. de Haan, Fauna Japonica, Crustacea, p. 179, Tab. XLV, fig. 3. 



Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 18 

 specimens of different size, males and females, some of which with eggs. 



The largest specimen, a male, is considered as the type of this new variable variety. 

 In this specimen which is 25 mm. long, the acute rostrum reaches to the distal fourth of the 

 visible part of i st antennular article, the rostrum is, however, narrower than in the variety Maleusis 

 Cout., but not so narrow as in the variety sfylirostris Cout. (Coutière, Alpheidae Mald. and 

 Lacc. Archip. 1905, PI. LXXXVI, figs. 48 and 49), for it is 3-times as long as broad 

 at i 1 3 base; the upper surface is flattened, as in the two other varieties and as in the 

 typical species, the lateral margins are distinct, though not very sharp and they make right 

 angles with the perpendicular side-walls. The furrows between the rostrum and the orbital hoods 

 are moderately deep, their outer margins are indistinct, rounded; at either side of the rostrum 

 the frontal margin shows a slight, rounded prominence, between which and the rostrum the 

 frontal margin appears concave. Antennular and antennal peduncles, stylocerite and scaphocerite 

 as in the variety Malensis, but the outer margin of the scaphocerite appears more concave 

 than in Coutière's figure 4S and the terminal spine, the point of which is directed inward, 

 reaches to the micldle of the 2 nd article, the stylocerite, finally, just reaches beyond the 

 i st article. Spine on the basicerite extremely small, 0,2 mm. long. 



External maxillipeds reaching to the middle of third antennular article. 



In both chelipeds there is a spine at the far end of the infero-internal margin of the 

 merus, in the larger cheliped larger than in the other. The large chela closely resembles that 

 of the variety Maleusis, proportion between the length of the chela and the height of the palm 

 2,4, proportion between the height of the palm and that of the fingers 1,54, proportion between 

 the length of the chela and that of the fingers 2,6; the two last numbers are for the variety 

 Malensis respectively 1,6 and 2,75. The lobe on the rounded, upper margin of the palm is 

 subacute, the much broader lobe of the lower margin is also acute, but its external margin 

 runs less obliquely than in the figure 48a of Coutière's paper. 



Small chela in the male Balaeuice/>s-shaped, in the female not, different therefore from the 

 variety sfy/irosfris. Not only the chela, but the whole cheliped of the male closely resembles 

 that of the male of A. chiragriens H. M.-Edw.; proportion between the length of the chela 

 and the height of the palm 4,3 (in the variety Malensis 4,7), proportion between the length of 

 the chela and that of the fingers 2,1, the palm being slightly longer than the fingers; the dactylus 

 agrees with that of A. chiragriens and the two depressions on the palm are shallow, but distinct. 



274 



