82 



is small. The 6th abdominal somite is more than half again as long as the 5th. 

 The telson is longer than the exopodite of the caudal swimmerets and its lateral 

 spines are conspicuous. 



The inner angle of the eyestalk is produced to form a spine that embraces 

 the cornea. 



The antennal scale is nearly three-fourths the length of the carapace proper. 

 The thoracic legs are similar in structure and proportions to those of A. eximia, 

 except that the 3rd pair are not longer than the 4th and 5th pairs. 



Colour in life crimson. 



In an egg-laden female the rostrum is 6 millim. long, the carapace 16 

 millim. long, and the abdomen 54 millim. 



From the Arabian Sea in 937, 1000, and 1043 fathoms, the Bay of Bengal 

 in 364, 840, and 869-913 fathoms, and the Andaman Sea in 922 fathoms. 



-r, j tvt 6089 6751-6752 /m £ , ■, . N 529 6088 6090 811 3437 



Kegd. N os. -g- : — - — (Types of the species) : T : — : -^ : -^ : -^ : 



3441-3442 



10 



44. Acanthephyra cvlstata, Faxon. 



Acanthephyra cristata, Faxon, Bull. Mas. Comp. Zool. XXIV. 1893, p. 206, and Mem. Mus. Comp. Zool., XVIII. 

 1895, p. 162, pi. xliii. figs. 1 a-b : Anderson, Jonrn. As. Soc. Bengal, LXV. pt. 2, 1896, p. 94. 

 Illustrations of the Zoology op the Investigator, Crustacea, Plate XXV. Fig. 2. 



The rostrum and carapace combined are not nearly as long as the abdomen 

 without the telson. 



The rostrum is about three-fourths the length of the rest of the carapace : 

 its basal portion forms a very prominent crest which falls away in the after half 

 of the gastric region and gradually disappears a short distance in front of the 

 posterior border of the carapace : it is armed dorsally on the basal crest with 

 about 7 rather close-set teeth and in front of the crest with 4 distant teeth, 

 and ventrally with 4 distant teeth. 



From the post-antennular spine a sinuous ridge runs backwards and almost 

 meets the ridge that defines the upper limit of the branchial region. The post- 

 antennal spine is salient but is not buttressed by any long carina. The cervical 

 groove is obsolete. 



The only abdominal terga that are distinctly carinated are the 3rd and 

 4th : the carina of the 3rd ends in a spine of medium size, that of the 4th 

 in a much smaller one. The 6th abdominal somite is more than twice as long as 

 the 5th. The telson is as long as the exopodite of the caudal swimmeret. 



The distal end of the outer border of the basal joint of the antennular 

 peduncle is not produced, and the scale at the basal end of that border is hardly 

 half the length of the joint. 



