REPORT ON THE CRUSTACEA MACRURA. 



735 



It closely resembles Acanthephyra sica, from the neighbourhood of New Zealand, 

 from which it appears to differ only in having the denticles on the frontal crest larger 

 and more distantly placed, and, according to A. Milne-Edwards and Sidney Smith, in 

 having no tooth on the fourth somite of the pleon. Nevertheless Sidney Smith found it 

 present in one out of the three specimens he examined : to quote his own words, " the 

 carina being most conspicuous on the third somite, where it projects posteriorly in a very 

 long and slender tooth. There is a similar but much smaller tooth on the three suc- 

 ceeding somites, though in two of the three specimens examined it is nearly or quite 

 obsolete on the fourth somite." 



Sidney Smith's specimen was taken in nearly the same degree. of latitude, but between 

 30° and 40° further west. 



Acanthephyra longidens, n. sp. (PI. CXXIV. fig. 4). 



Carapace smooth, anteriorly compressed, and slightly carinated and produced to a 

 narrow, slender rostrum, directed obliquely upwards, dorsally armed with a crest of 

 three small teeth, whence it is continuously smooth to the apex. Under margin 

 smooth at the base, where it carries a series of long hairs, and armed towards the apical 

 extremity with six small teeth. The two antennal teeth are small. 



Anterior three somites of the pleon divided into two portions, dorsally smooth 

 and without a carina. Third somite having the posterior division carinated and 

 produced to a long, slender, spine-like tooth, that runs parallel with and extends beyond 

 the posterior extremity of the next succeeding somite. Fourth and fifth somites 

 slightly carinated but not posteriorly produced ; the sixth is slightly carinated and 

 posteriorly^produced to a small tooth. 



Telson dorsally smooth, rounded, laterally compressed, and armed with several 

 small spines on each side ; the extremity, terminating in two or three spines, reaches 

 beyondgthe outer ramus of the rhipidura. 



Ophthalmopoda small, and the other appendages rather short. 



Habitat. — Station 198, October 20, 1874 ; lat. 2° 55' N., long. 124° 53' R; near the 

 Philippine Islands; depth, 2150 fathoms; bottom, blue mud; bottom temperature, 

 38°'9. One specimen; male. Trawled. 



