40 



31. Alphcus lepidtis de Man. PI. IV, fig. 17. 



Alphcus lepidiis J. G. de Man, Siboga Exp., Monogr. XXXIX «', Part II, Family Alpheidae, 

 191 1 (text) p. 397, 191 5 (plates) PI. XXI, fig. 92—92/. 



Stat. iSi. September 511. Ambon-anchorage. 54 m. Bottom mud, sand and coral. 2 egg- 

 bearing females. 



The carapace of the larger female is 4,9 mm. long, telson and 6"' somite are lost; 

 the entire length of this specimen will, however, have been about 14,6 mm., because the other 

 specimen, in which carapace and abdomen are respectively 4,5 mm. and 8,9 mm. long, measures 

 13,4 mm. As regards the characters of the carapace, the antennular and antennal peduncles 

 and the scaphocerite, these specimens fully agree with the original description. The telson of 

 the smaller female is 1,7 mm. long, anteriorly 0,8 mm. broad, the distance between the postero- 

 lateral angles 0,46 mm. The anterior pair of dorso-lateral spinules are implanted a little before 

 the middle, the distance between this pair and the posterior margin being 1,06 mm., while 

 ihc posterior margin is 0,6 mm. distant from the posterior pair. 



Measured along the upper margin the merus of the large cheliped proves to be 2,16 mm. 

 long, while the outer surface is 0.6S mm. broad in the middle, so that the merus is 3,2-times 

 as long as broad ; the serrulations of the infero-external margin are nearly 30 in number, the 

 infero-internal border bears 4 spinules that slighdy increase in length from the i^' or proximal 

 one to the 4''', which is 0,09 mm. long and implanted at the anterior third; the acute tooth 

 at the distal end of this border is small. The ischium presents also a small spinule inferiorly. 

 The chela also agrees with the original description and the figure 92 c; it is 4,2 mm. long, 

 measuring ''/r of the length of the carapace, palm 2,8 mm., fingers 1,4 mm., while the palm is 

 1,35 mm. high. The small cheliped, placed at the right side, was still unknown (I'ig. 17). Merus 

 a little longer than that of the large cheliped, but for the rest closely resembling it ; outer sur- 

 face 2,5 mm. long, 0,82 mm. broad, ju.st 3-times as long as broad, upper border unarmed, 

 outer margin serrulate like in the other leg, inner border with 5 movable spinules, ot which the 

 distal one, at the anterior third, is 0,12 mm. long, while the preceding ones diminish in length; 

 the inner border, that appears also somewhat serrulate, is furnished with setae and has a 

 very small acute tooth at the distal extremity, which is only half as long as the foremost 

 movable spinule. Carpus long 0,86 mm., 0,62 mm. high distally, about one and a half as 

 long as high. The small chela is 3,75 mm. long, palm 1,45 mm. long, fingers 2,3 mm., and 

 the palm is 0,82 mm. broad near the articulation of the fingers; this chela, only a litde shorter 

 than the larger, has a more slender shape, being 4,6-times as long as broad, while the fingers 

 are one and a half as long as the ])alm. The palm, like that of the other leg, has no 

 transverse groove near the dactylus and is smooth, though fiirnished with long hairs 

 along the upper and lower border at the inner side ; though the fingers are straight and 

 ]jarallel, they leave a narrow interspace between them and they are, on the inner side, covered 

 with hairs. 



In the younger specimen both peraeopods of the p' i)air are wanting and in both females 

 also the legs of the 2°*^ pair. 



In the larger female the merus of the 3'<' leg is 6Y.j-times as long as broad in the 



