X^ _ ■ ^^HT ■— U 



164 



STALK-EYED CRUSTACEA. 



two pairs of longitudinal lateral carinse on the carapace, a dorsal carina on 

 the fourth abdominal segment, and in the absence of a scries of denticles on 

 the posterior margin of the tergum of the fourth and fifth abdominal seg- 

 ments. From A lanccocaudala (Bate) it also differs in its shorter rostrum, 

 more prominent lateral and dorsal carina) of the carapace, and the absence 

 of a prominent tooth on the anterior margin of the first abdominal segment. 



Acanthephyra curtirostris Wood-Mason. 



Plate XLIIL, Fig. 2-5. 



Ann. Mag. Nat. Hist, 6th Ser, YIL 195, 1891, IX. 364, Fig. 5, 1892 ; 111. Zobl H. M. I. M. S. "Inves- 

 tigator," Crustacea, Plate 111. Pig. 4, 1892. 



This species is thus briefly characterized bj Wood-Mason : " Closely allied 

 to A. aciiUfrons Spence Bate^ differing therefrom in its shorter and smaller 

 carapace and in its much less produced rostrum, which does not reach be- 

 yond the middle of the terminal joint of the antennulary peduncle and is 

 armed on its upper margin with nine minute saw-like teeth, on its lower 

 with a single strongish spine. The ocular papilla embraces the cornea." 

 The type specimens were taken in the Bay of Bengal in 840 fathoms, and 

 in the Laccadive Sea in 1000 fathoms. 



In specimens from the "Albatross" dredgings, which I take to be of the 

 same species, the integument is smooth and of a firm consistence. The 

 length of the carapace, including the rostrum, is equal to the distance 

 from the anterior end of the abdomen to the middle of the fourth abdom- 

 inal somite. The rostrum does not reach beyond the second segment of 

 the antennular peduncle ; it is very deep at the base, and ends in a short 

 and acute tip; the superior margin is inclined upward at a small angle 

 with the axis of the body, and is armed with a fine of eight or nine 

 teeth which runs nearly to the tip of the rostrum ; the lower margin is 

 armed with one strong tooth. Behind the superior row of teeth the dorsal 

 margin is continued back as a low rounded ridge, which disappears before it 

 attains to tlic hind margin of the carapace. The anterior margin of the cara- 

 pace is prominently angulated below the eye, above the antennal spine. The 

 antennal spme is short, flattened, and continuous with a longitudinal carina on 

 the hepatic area. A low, obtuse ridge bounds the branchial regions above, 

 and the gastric region is separated from the cardiac by a shallow, obsolescent 

 furrow. The second to the sixth abdominal somites are carinated in the 

 median dorsal line, the carina terminating in a sharp tooth at the posterior 



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