50 



The epistome is long and narrow. Tlie external maxillipeds have the menis 

 as broad as the ischium, somewhat dilated at the antero-extemal angle, and some- 

 what excavated at the antero-internal angle for the insertion of the small palp. 



The chelipeds are not much stouter, and not much shorter than the next 

 pau" of legs, which are the longest : the dactyli of the legs, though stout recurved 

 and prehensile, are not toothed along the posterior edge. 



Abdomen, in both sexes, seven-jointed. 



Sjilienocarcinus cuneus (Wood-Mason). 



Oxypleurodon cuneus. Wood-Mason, Ann. Mag. Nat. Hist., (6) VII. 1891, p. 261. 



Sphenocarcinus cuneus, Alcock, J. A. S. B., Vol. LXIV. pt. 2, 1895, p. 193 : III. Zool. Inventigator, Crnst. 

 pi. xxi. figs. 1, la. 



Carapace elongate sub-pentagonal, narrowing to a long tapering cyhndrical 

 rostrum, which, in the male, is longer than the carapace and only emarginate at 

 the extreme tip, but, in the female, is shorter than the carapace and distinctly 

 bifid at the end. 



The carapace is symmetrically honey-combed by deep channels, which leave 

 between them great symmetrically undermined islets, as follows: — one, very 

 elongate-oval, on the gastric region ; one, triangular, on the cardiac region ; one, 

 somewhat semilunar with one horn much produced laterally, on each branchial 

 region ; and one, Cupid's bow-shaped, along the posterior border. Besides these 

 there are some smaller islet-like excrescences, namely, on each side, a supra- 

 ocular, post-ocular, hepatic, and branchial. 



Between the supra and post-ocular excrescences, are set the small squat 

 little-movable eyes. 



Of the trunk-legs, the 2nd pair {i.e., first ambulatory legs) are the longest, 

 beino- very slightly longer than the chelipeds, and considerably shorter than the 

 carapace measured with the rostrum, but much longer than any of the last 3 

 pairs of legs. 



In the female all the long joints, except the dactyli, and in the male all 

 except the dactyli and propodites, both of chelipeds and of legs, are strongly 

 carinated dorsally : in the case of the carpopodites there is a second dorsal carina. 

 The chelipeds are hardly stouter than the next pair of legs, except as 

 regards the palm in the male, which is broadened and somewhat inflated. In 

 neither sex are the short white polished fingers apposable throughout. 



Male. Female. 



Length of carapace and rostrum ... 19 milhm. ... 18-5 millim. 



Greatest breadth of carapace ... 12 „ ... 13 „ 



Length of rostrum alone ... 10" 5 „ ... 8' 7 „ 



Length of 2nd pair of trunk-legs ... 15'5 „ ... 15 „ 



From the Andaman Sea, 161 to 250 fathoms. 



