REPORT ON THE AMPHIPODA. 889 



rami in like manner, these being all lanceolate, but not broadly so, and, as well as the 

 peduncles, being bordered with small spines ; the peduncles of the first pair longer than 

 the rami, those of the second pair a little shorter, and those of the third pair much 

 shorter ; in the first and second pairs the outer ramus a little shorter than the inner, in 

 the third pair the rami equal. 



Telson rather longer than broad, somewhat boat-shaped, shorter than the peduncles of 

 the third uropods, the lateral margins and broad distal margin convex. 



Length. — The specimen, in the position figured, measured eleven-twentieths of an inch 

 I'n mi the front apex of the front (broken) horn of the first pera?on-segment to the apex of 

 the horn of the first pleon-segment. 



Locality. — Station 150, off Heard Island, February 2, 1874; lat. 52° 4' S., long. 

 71° 22' E.; depth, 150 fathoms; bottom, coarse gravel; bottom temperature, 35°'2. 

 One specimen, female. Dredged. 



Remarks. — The specific name refers to the triple carina formed by the processes on 

 the peraeon-segments. The animal seems to have developed a spiky process at every 

 available point, so as to become a veritable ball of prickles. Its cylindrical figure 

 distinguishes it strongly from Acanthonotozoma serratum, Fabricius, of which Mr. J. 

 Sparre Schneider has kindly sent me specimens. That species is comparatively com- 

 pressed, has a long rostrum, and no special flexure of the pleon. With Acanthozone, 

 Boeck, of which the type is Oniscus cuspidatus, Lepechin, the present species agrees 

 in general habit. 



t>^ 



Genus Iphimedia, Rathke, 1843. 



1 843. Iphimedia, Ratlike, Beitrage zur Fauna Norwegens, p. 85. 



1846. Microcheles, Kr0yer, Naturh. Tidsskr., R. 2, Bd. ii. p. 66. 



1852. Iphimedia (pais), Dana, U.S. Explor. Exped., vol. xiii. pt. ii. pp. 910, 926. 



1855-6. „ (?) Stirapson, Proc. Acad. Nat. Sciences, Philadelphia, vol. vii. 



1857. „ Spence Bate, Nat. Hist. Review, vol. iv. p. 229. 



1857. „ White, Popular Hist. Brit. Crust., p. 176. 



1859. „ Bruzelius, Skand. Amph. Gamru., p. 80. 



1860. „ Boeck, Fork. Skand. Naturf. 8de Mtfde, p. 654. 

 1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 123. 

 1862. „ Bate and West wood, Brit. Sess. Crust., p. 217. 



1864. „ Grube, Beschreib. Amph. istrischen Fauna, p. 202. 



1865. „ Lilljeborg, On the Lysianassa magellanica, p. 18. 

 1870. „ Boeck, Crust, amph. bor. et arct., p. 101. 



1S74. „ Stebbing, Ann. and Mag. Nat. Hist., ser. 4, vol. xiv. p. 11. 



1876. „ Boeck, De Skand. og Arkt. Amph., p. 244. 



1880. „ (?) Haswell, Proc. Linn. Soc. N.S.W., vol. iv. p. 327. 



1880. Panophxa, Thomson, Ann. and Mag. Nat. Hist., ser. 5, vol. vi. p. 2. 

 1880. Panoplxa, Thomson, Trans. New Zealand Inst., vol. xiii. p. 212. 



(ZOOL CHALL. EXP. — PART LXVII. 1887.) XxX 1 1 2 



