382 



Merus of the large cheliped of the male 3,5-times as long as broad, upper margin unarmed 

 at ajaex, infero-external margin finely serrulate, infero-internal with 4 aciculiform spinelets and 

 ending in a small acute tooth. Chela obliquely turned outward, one and a half as long as the 

 carapace (rostrum included) and about 3-times as long as high, the palm presenting its greatest 

 heio-ht (or breadth) at one-fourth from the carpal articulation. The jDalm, distinctly compressed, 

 being half as thick as high, narrows toward the articulation of the fingers, that are almost half 

 as loner as the palm; upper border of the palm entire, without a transverse groove, 

 appearing finely granular under a lens until near the articulation of the fingers that are smooth. 

 Both the upper and the lower border are fringed with hairs at the inner side, like in other 

 species. Dactylus a little longer than the immobile finger. 



In the female specimens the large cheliped is missing. Of the small cheliped of the 

 male the merus is 4-times as long as broad, upper margin unarmed at the apex, infero-external 

 margin serrulate, infero-internal with 5 acicuHform spinelets, the extremity unarmed. Chela a 

 little shorter than the larger, one-fourth longer than the carapace; palm as long as the fingers, 

 almost 3-times as long as high, somewhat compressed, very slightly granular, upper border 

 without a transverse groove. Fingers slender, dactylus Ba/aemce/>s-shaped. In an egg-bearing 

 female from Stat. 114 the merus of the small cheliped is almost 5-times as long as broad, 

 for the rest it agrees with that of the male, but it presents a small acute tooth at the far 

 end of the infero-internal margin. Chela shorter than the small chela of the male, as long 

 as the carapace without the rostrum; fingers slender, tapering, shutting together when closed, a 

 little (one-seventh) longer than the palm, which is 3-times as long as high and somewhat 

 compressed. Like in the male, both margins of the chela are fringed with hairs at the inner 

 side. In the adult male from Stat. 114 the carpal segments of the 2^^ legs are 0,9 mm., 

 1,26 mm., 0,45 mm., 0,46 mm. and 0,44 mm. long; the 2"'^ segment is 9-times as long as 

 thick and the chela is 0,8 mm. long (palm 0,3 mm., fingers 0,5 mm.). In an egg-bearing female 

 from the same station the carpal segments are 0,94 mm., 1,22 mm., 0,48 mm., 0,48 mm. 

 and 0,46 mm. long, w^hile the 2^'^ segment is also 9-times as long as thick; chela 0,78 mm. 

 long (palm 0,3 mm., fingers 0,48 mm.). These numbers prove that the 2°^^ segment is one- 

 third longer than the i*', that the three last segments are equal, half as long as 

 the first, that the chela is a little shorter than the i^' segment, that the fingers are one 

 and a half as long as the palm and that the carpus has a very slender form, the 2"'^ 

 segment being 9-times as long as thick. It is from the slender form of the carpus that the 

 specific name is derived. 



Ischium of 3^'^ and 4'^ legs with a movable spine. Merus of 3 '^'^ legs unarmed, slender, 

 8-times as long as broad; carpus half as long as the preceding joint, propodus little longer than 

 the carpus (proportion 1,2), very slightly curved and somewhat narrowing towards the distal 

 extremity; both margins of the jDropodus w-hich is 9-times as long as broad in the middle, 

 are beset with long setae while one observes 5 or 6 sjainules along the posterior margin. 

 Dactylus lanceolate, slightly arcuate, about half as long as the propodus, decidedly broader 

 in the middle than high. 



Merus of 4"^ legs one-fourth shorter than that of the y^ pair. 



250 



