656 THE VOYAGE OF H.M.S. CHALLENGER. 



Telson as broad as long, not reaching to the end of the peduncles of the third 

 uropods, cleft for less than two-thirds of its length ; a small lateral spine on each side 

 level with the top of the somewhat dehiscent cleft, tlic apices rounded not quite 

 smoothly, less produced on the outer than the inner side, and on the outer side showing 

 a cavity as if for a spine, above which is a small cilium. 



Length of the specimen from the forehead to the back of the third pleon-segmeut, in 

 the position figured, just under half an inch. 



Locality. — Off Christmas Harbour, Kerguelen. One specimen, female. 



Remark. — This being one of the most interesting forms among the Amphipods brought 

 home by the Challenger, I do myself the pleasure of naming it after Mr. John Murray, 

 under whose skilful and energetic administration the scientific results of the expedition 

 are being worked out. 



o 



Genus Cyphocaris, Liitkeu and Boeck. 



From the account of this genus given by Boeck in 1870 (see Note on Boeck, 1870, 

 p. 398) must be excluded the statements that the second guathopods are destitute of a 

 nail, and that the third and fourth side-plates are coalesced. They may or may not be 

 characters of the type-species, but the two species here described are without these 

 characters and yet beyond all question belong to the genus. 



Cyphocaris micronyx, n. sp. (PI. XVL). 



Head almost concealed in the over-arching first pera^on-segment, the summit of the 

 head when Avithdrawn from its shelter taking a frontal position, while the lateral margin 

 excavated for the antennae faces downwards ; first pera3on-segment rather sharply 

 outdrawn in front, in one of the specimens, fig. A, forming a peak, and in this exceeding 

 in length the three following segments combined, in the other specimen, fig. B, not 

 quite equalling them ; the fifth, sixth and seventh segments successively increasing in 

 length ; the first three segments of the pleon each subequal to the first of the perason, 

 exceeding it in fig. B, falling short of it in fig. A ; the fourth segment with a deep dorsal 

 depression near its origin ; the fifth and sixth as long as the fourth and fifth of the 

 perseon. The first three pi eon-segments posteriorly squared below, with the angles of the 

 second and third a little rounded, those of the first segment more decidedly. 



Eyes doubtful. 



Upper Antenna}. — First joint stout, longer than the two following together ; second 

 and third joints short, rather stout and tapering ; flagellum of twenty-one joints, the 

 first very long, tapering, with a large brush of long and broad filamentary cylinders in 



