i6o 



species of the genus Athanas, different from the other species of Jousseaumea. The carpus is 

 short, conical and embraces the palm, while its distal margin is emarginate at the outer, at 

 the upper and at the inner side. The chela, which is 2,94 mm. long, about two-thirds the 

 length of the carapace, rostrum included, is almost 3-times as long as high (1,05 mm.); this 

 number is the height or width of the upper (inner) surface of the palm. The outer (upper) 

 border of the palm, which is ovoid, swollen and a little longer than the fingers, is marked 

 with a longitudinal groove, but this groove is, perhaps, owing to desiccation. Near the carpal 

 articulation the palm is deeply notched at the lower side, so that the inner (lower) border 

 shows proximally an obtuse, dentiform angle; the lower (outer) face of the palm, that fits into 

 the concavity of the merus, is more convex than the upper. The fingers, which closely resemble 

 those of yo7is. seri-atidigitus, are strongly compressed, shut close together and their pointed 

 tips are crossing one another; they are armed, like in that species, with 9 or 10 conical teeth 

 along the whole length of the prehensile edge, and these teeth progressively increase in size 

 from the first at the base to the last near the tip. 



Second legs nearly as in Jons, latirostris Cout. (H. Coltiere, 1. c. p. 247, Fig. 299). 

 Merus slender, slightly bent, 8,6-times as long as wide. Carpus one-fourth longer than the 

 merus, slender; first segment 0,85 mm. long, longer than the sum of the following, the pro- 

 portion being as i : 0,75 ; second segment about one-fifth the first, as long as the third and 

 the fourth taken together, the third and the fourth of equal length; fifth article a little longer 

 than the second. Chela twice as long as the fifth article, almost 3-times as long as high or 

 broad, the proportion being as 2,8 : i ; fingers a little longer than the palm. 



Ischium of third legs with a movable spine at the base. Relative dimensions of these 

 legs: merus 1,5; carpus i; propodus 1,15. Merus unarmed, 4, 3-times as long as wide, carpus 

 5,2-times, propodus 7,7-times; the slender carpus bears a short spinule at the far end of the 

 lower margin, the propodus that slightly widens distally, bears only two feeble spinules, as 

 long as the spinule of the carpus, on its posterior margin but a longer and stronger one at 

 the distal extremity, while a short spinule occurs at the distal end of the anterior border. The 

 dactylus, half as long as the propodus, is simple and slender, being 6-times as long as broad 

 at its base. The following legs have lost their propodi and dactyli. 



Ova 0,63 mm. long. Length 10,5 mm. 



t2. yousseaumea hilarula de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 304. 



Stat. 164. August 20. i°42'.5S., i30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, 

 small stones and shells. 2 specimens of equal size. 



Carapace depressed. Rostrum triangular, acuminate, a little wider at its base 

 than long and reaching to the apex of the second antennular article; the lateral margins 

 are concave or, as in the other specimen, angular, the angle appearing just behind the distal 

 extremity of the first antennular article. Lateral teeth, i. e. the extra-corneal teeth, very small and 

 short, acute and directed as in Jous. serratidigitus Cout. and as in Jo2is. Sibogae de Man, their 

 inner margins being at a right angle with the lateral margins of the rostrum. The upper surface 



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