REPORT ON THE CRUSTACEA MACRURA. 747 



Acanthephyra edwardsii, n. sp. (PL CXXVI. fig. 1). 



Carapace laterally compressed and dorsally carinated, and anteriorly produced to a 

 straight rostrum that is armed on the crest and upper margin with seven small teeth, 

 two at the base and five in advance of the orbit, and with four teeth on the lower margin 

 near the apex, distally and unequally separated from one another. 



The second somite of the pleon is feebly carinated, the third is more distinctly so and 

 produced to a slender tooth about one-third the length of the next somite; the fourth, 

 fifth, and sixth somites are produced to a point that can scarcely be called a tooth. 



The telson is long and tapering. 



The three posterior pairs of pereiopoda are armed with numerous small spines on the 

 posterior margin ; the third and fourth pairs terminate in a long, styliform dactylos, and 

 the fifth in a very small one. 



Habitat— Station 126, September 12, 1873; lat. 10° 46' S., long. 36° 8' W.; south 

 of Pernambuco ; depth, 770 fathoms ; bottom, red mud. Two specimens ; one male, 

 one female. Trawled. 



This species very much resembles Acanthephyra carinata, but may readily be 

 distino-uished from it by the form of the armature on the dorsal crest of the carapace. 

 In Acanthephyra carinata the serrature is formed like a series of oblique divisions in the 

 narrow carina, whereas in the present species it is formed as a row of distinctly separate 

 teeth, five of which are near together and form the crest, and two or three others, 

 which are more distant, upon the rostrum, the most distant being on a level with the 

 posterior on the lower margin, from which to the apex the upper surface is smooth. The 

 lower surface is armed with four teeth, the posterior corresponding with the anterior on 

 the upper surface, the second is close to it, and the other two are subequally distant from 

 each other and the apex. The dorsal carina is not very elevated and is continuous from 

 the rostrum to the telson. 



• The pleon is arched and not strongly carinated, the carina culminating at the third 

 somite, which is posteriorly produced to a tooth that is not very elevated but reaches to 

 about one-third of the length of the fourth somite ; the fourth somite terminates in the 

 median line in a sharp tooth, almost at right angles ; the fifth projects a very little, and 

 the sixth is produced still more but not sufficiently to be described as a tooth. 



