80 



The abdomen is carinated as in A. eximia, but the carina of the 2nd tergum 

 is low, and the tooth that terminates the carina of the 3rd tergum is very little 

 larger than those of the 4th, 5th and 6th, overlapping the 4th tergum only a very 

 short way. The telson is longer than the exopodite of the caudal swimmeret, and 

 the spines on the distal two-thirds of its lateral borders are very conspicuous. 



The antennal scale is more than two-thirds the length of the carapace. 



The thoracic appendages have nearly the same proportions and structure as 

 in A. eximia, except that the 5th pair of legs are very decidedly longer than the 

 3rd and 4th. 



Colour in life deep crimson. 



In the largest specimen the length of the rostrum is 25 millim., of the 

 carapace 22 millim., of the abdomen 64 millim. 



Arabian Sea in 295-360, 445-886, 480, 738, 865, 902, 937, and 1091 

 fathoms, Bay of Bengal in 1748 fathoms, Andaman Sea 194, 370-419, 409, and 

 640 fathoms. 



This species is very like A. purpurea A. M. Edw. (= A. agassizii Smith), 

 from the Atlantic, but it is at once distinguished by the minute post-antennal 

 (" branchiostegal ") spine. 



. AT 45 526 . m ,, . ,. 6758 9225 9230 1724 2577-2579 



Regd. Nos. j : (Types of the species) : -y- : -g- : : : - : 



2606 . 3406 . 3439 _ 3855 . 3866 

 10 ' 10 ' 10 ' 10 ' 10 ' 



42. Acanthephyra microphthalmus, S. I. Smith. 



Acanthephyr* mieropMialma, 8. I. Smith, Proc. U. S. Nat. Mus. VII. 1884 (1885), p. 502, and Rep. U. S. Fish. 

 Comra. for 1885 (1886) [p. 64], pi. xiii. Hg. 3 : Wood-Mason, Ann. Mag. Nat. Hist. (6) IX. 1892. p. 361. 

 Acanthephyra longidenx, Spence Bate, Challenger Crust. Macrura, p. 735, pi. c*xiv. fig. 4. 



Distinguished from J.. eximia, by the following characters : 



The rostrum, which is not produced to the posterior border of the carapace 

 either as a crest or as an indistinct ridge, is about as long as the rest of the 

 carapace : its basal fourth is deep and slightly ascendant, its distal three-fourths 

 is slender and strongly upcurved : dorsally it is armed along its basal crest only 

 with from 3 to 5 little teeth, beyond which it is quite smooth, ventrally it is 

 armed in its distal two-thirds with 6 or 7 equidistant teeth. 



No ridge defines the branchial regions superiorly : the hepatic groove is 

 oblique and very fine : the post-antennal spine is very small, hardly larger than 

 the post-antennular spine. 



The 2nd abdominal tergum is not carinated, but the 3rd, 4th, 5th, and 6th 

 are the 3rd and 4th very strongly so, the carina? of these two terga together 

 forming a compressed hump. The carina of the 3rd tergum is the only one that 

 is distinctly produced, it being prolonged posteriorly to form a long slender 



