744 THE VOYAGE OP H.M.S. CHALLENGER. 



are near the apex, while the third stands alone near the centre of the rostrum, and none 

 of thern correspond with any on the upper margin, but stand nearly equidistant between 

 them. It was taken associated with four specimens of Acanthephyra brachytelsonis. 



Acanthephyra armata, A. Milne-Edwards (PL CXXV. fig. 2). 



Acanthephyra armata, A. Milne-Edwards, Ann. d. Sci. Nat., se>. 6, torn. xi. p. 12, 1881. 



Carapace armed on the frontal crest with five small teeth, closely packed together. 

 Rostrum elevated anteriorly, smooth on the upper surface, and armed on the lower with 

 one large tooth that gives a forked appearance to the rostrum. 



Four posterior somites of the pleon dorsally carinated and posteriorly armed with 

 four subequal teeth. 



Telson subequal in length with the sixth somite of the pleon. 



JIa&ifa*.— Station 194, September 29, 1874 ; lat. 4° 34' 0" S., long. 129° 57' 30" K; 

 off Banda Island ; depth, 200 fathoms ; bottom, volcanic mud. One specimen, male. 

 Dredged. 



o 



The carapace is smooth, dorsally carinated, and anteriorly produced to a rostrum 

 as long as the carapace, strengthened at the base by a ridge on each side, and armed 

 on the upper surface with a crest of five small teeth placed closely together over the 

 frontal region, whence it is smooth to the apex ; the lower surface is armed with a large 

 solitary tooth rather more than half-way between the base and the apex, and beyond 

 this tooth the rostrum curves upwards. On each side above the branchial region is 

 a small longitudinal elevation, that dies out anteriorly above the hepatic region and 

 posteriorly before it reaches the posterior margin, w T hich lies under the lateral walls of 

 the first somite of the pleon. 



The pleon is laterally compressed and dorsally carinated, except the first somite, 

 which is smooth, and has the anterior margin of the coxal plate overlapping the 

 posterior margin of the carapace and widely excavated. The second somite is dorsally 

 carinated, but not produced to a tooth ; the third somite is dorsally carinated, the 

 carina commencing abruptly with the posterior division and being produced posteriorly 

 to a strong laterally compressed tooth ; the fourth somite is dorsally carinated, the 



