H 



CRUSTACEA MAI^ACOSTRACA. II. 



3-jointed inner flagellum. — AnteniiEe with the sqnama conspicuously shorter than the penultimate 

 joint of the flagellar peduncle; the flagellum 8-jointed. 



Chelipeds (fig. 3 b) agreeing with the figure of Norniau &. Stebbing, thus ratlier slender and 

 without an\- spine or tooth on the posterior or lower margin of the joints. Basal joint not full\- four 

 times as long as broad ; lower margin of the carpus half as long again as that of the ischium. Chela 

 almost three and a half times as long as broad, with the posterior margin somewhat concave; movable 

 finger conspicuousl\- more than half as long again as the front uuirgin of the hand and considerably 

 overreaching the fixed finger, which has the major part of the distal half of its incisive margin fineh- 

 serrate (fig. 3 c) and a number of setae inserted on the outer side along the serration. 



Second thoracic segment, seen from above (fig. 3a), has the first joint of its legs triangular 

 with the front margin even sloping a little backwards and the outer angle produced a little forwards; third 

 segment with the outer angle acute and produced slight!)' forwards. The four posterior segments more 

 slender than in A. viciiiits ; their lateral process proportionately somewhat small with the terminal part thin 

 and no protruding proximal angle in front or behind; each segment furthermore with a small or rather 

 small process on the ventral surface. ~ Second pair of legs (fig. 3d) somewhat slender; second joint without 

 any spine at the posterior distal angle; fourth joint even slightly longer than the two following joints 

 combined, without any spine above or below at the end, but with a number of sette on the upper part 

 of the outer side and along the distal half of the lower margin; fifth joint slightly shorter than the 

 sixth and even slightly broader than long, with a terminal upper spine and two spines on the lower 

 margin; sixth joint distinctl}' less broad than the fifth, not much longer than broad, with two distal 

 spines abo\^e and eight spines along the lower margin; se\enth joint with two denticulations below. — 

 (Seventh pair of legs lost in the specimen). 



Abdomen about as long as the four posterior thoracic segments combined, slender, h'ive anterior 

 segments not fully as slender but otherwise shaped nearly as in the following specie.s, thus witli the 

 jjrocesses from the postero-lateral angles thin and very short, but without processes below. Sixth 

 segment about as long as the sum of the four preceding segments, not fully four times as long as broad, 

 without minute lateral tubercles or setae. — (Uropods lost*. 



Length of the specimen described, a female with the nuirsupial lamelke ver\- small, 13 mm. 



Remarks. The subadult specimen agrees with the description of Norman & Stebbing in 

 some important characters: the antennulas without serration on the first joint and a very short, 

 3-jointed inner flagellum (according to the text of the English authors this flagellum is 4-jointed, 

 but the figure has only 3 joints), the antennal squama short, the general shape of the cheliiDeds with 

 setse on the fixed finger and no spines on any joint, finally the shape and armature of the joints of 

 seconds legs excepting that the lower margin of sixth joint has only 8 spines instead of 10. But it 

 differs in several features: the processes of the cephalothorax and thoracic segments are much smaller 

 than according to the Knglish figures, the abdomen has no processes below and no tubercles on the last 

 segment, the movable finger of the chelae is longer than the fixed, finally some further particulars to 

 be found by a comparison of my text with the description of Xorman .S: Stebbing. I am, howe\-er, 

 apt to think that my immature specimen is only a kind of variety of A. gracilis, not a separate species, and 

 especially the shape and armature of the joints of second pair of legs bear strong witness for this view. 



