ACANTHEPHYRA CUCULLATA. 167 



Through Var. j, A. curtirostris approaches A. acnlifrons Bate, but in the 

 latter the carapace is much larger and longer in relation to the abdomen, the 

 dorsal carina of the carapace is more complete behind tlie rostral teeth, 

 the first abdominal segment is carinated, the telson is shorter and bears fewer 

 lateral spines, and, finally, an ocellus is present. 



Acanthephyra brevirostris Smith. 



Proc. U. S. Nat. Mus., VII. 50-1, 1885 ; Ann. Rep. U. S. Fish Comm. for 1885, p. 670, Plate XIV. Fig. 2, 

 Plate XV. Fig. 2, 8, Plate XVI. Fig. 1, 6, 1886. 



Station 3399. 1740 fathoms. 1 male. 



In this specimen there is a small tooth on the lower margin of the 

 rostrum which is wanting in the specimens from the Atlantic side of the 

 continent, and the great tooth of the third abdominal segment is not quite 

 so large as in the typical specimens. 



The integument in this species is soft and membranaceous, as in the 

 genus Hymenodom. Spence Bate has described a closely allied form under 

 the name of Hymenodora duplex* 



Spence Bate in 18^81 applied the specific name brevirostris, already appro- 

 priated by Smith, to a very different species of Acanilicpliyra from the tropical 

 Atlantic. It hence becomes necessary to change the name of Bate's species, 

 which I propose to call, in memory of its describer, Acanthephyra hatei. 



Acanthephyra cucullata Fa.x. 

 Plate XLIV., Fig. 1, 1\ 1". 



Bull. Mus. Comp. Zool., XXIV. 206, 1893. 



The integument is soft, membranaceous, and transparent in alcohol. 

 The carapace is carinated in the median dorsal line anteriorly ; this carina 

 is furnished with seven minute teeth, and is continued forward to a very 

 small acicular rostrum, which hardly reaches forward to the end of the eyes ; 

 the infero-lateral mai'gins of the rostrum are continued downward for some 

 distance, nearly parallel with one another, in an almost vertical direction, and 

 then they suddenly diverge and trend backward, forming the upper wall of 

 the orbit ; a sort of hood is thus formed of the anterior part of the carapace, 

 overhanging the facial region. The infra-orbital angle is rounded, not spinif- 

 erous. The antennal spine is acute, and advanced forward of the infra- 



* Rep. Challenger Macrura, p. 843, Plate CXXXVI. Fig. 3, 1888. 

 t Op. cit., p. 751. 



