REPORT ON THE AMPHIPODA. 1419 



of the third pair broad except at the base, rather longer than those of the first pair, the 

 apex of the inner margin acutely produced ; the outer ramus about half the breadth of 

 the inner, more than half its length, reaching back as far as the inner ramus of the first 

 pair, its inner margin strongly pectinate ; the inner ramus shorter than the inner ramus 

 of the first or the second pair, both margins strongly pectinate except near the base. 



Telsou less than a third of the length of the peduncles of the third uropods, about 

 as long as the breadth at the base, somewhat triangular, but the sides and apex much 

 curved. 



Length about a quarter of an inch. 



Locality.— March 15, 1874 ; south-west of Melbourne; lat 39° 45' S., long. 140° 40' 

 E.; surface ; surface temperature, 60° '2. Several specimens. 



Remarks. — The specific name refers to the southern locality at which the species was 

 found. The shape of the fourth joint in the first perseopods, the hairy margins in this 

 and the three following pairs, and the pectination on both edges of the inner ramus of the 

 third uropods are the distinguishing features of the species. 



A specimen, not in very good order, from Station 162, April 2, 1874, off East 

 Moncceur Island, Bass Strait, surface, appears to belong to this species. The first joint 

 of the flagelluni of the upper antennae has a narrow apical prolongation, within which 

 can be seen several small joints in preparation, and this is followed by six short joints. 



Genus Parathemisto, Boeck, 1870. 



1870. Parathemisto, Boeck, Crust, amph. bor. et arct., p. 7 (87). 

 1878. Lestrigonus, Spence Bate, Ann. and Mag. Nat. Hist., ser. 5, vol. i. p. 411. 

 1878. Hyperia, Spence Bate, Ann. and Mag. Nat. Hist., ser. 5, vol. ii. p. 487. 

 1882. Parathemisto, Sars, Oversigt af Norges Crustaceer, pp. 20, 75. 



1886. „ Forsstrand, Crustacea Malacostraca, pp. 16, 53. 



1866. Themisto, Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 490. 



1887. Parathemisto, Bovallius, Systematical List of Amph. Hyper., Bihang. till K. Svensk. 



Vetensk. Akad. Handl., Bd. 11, No. 16, p. 20. 

 1887. „ Bovallius, Arctic and Antarctic Hyperids, Vega-Exped., Bd. iv. p. 566. 



1887. „ Hansen, Oversigt Dijmphna-Togtet inds. Krebsdyr. 



1887. „ Hansen, Malacostraca marina Groenlandias occidentalis, p. 59. 



1888. „ Robertson, Catal. of Amph. and Isop. Firth of Clyde, p. 65. 



For the original definition of the genus, see Note on Boeck, 1870 (p. 397). Hyperia 

 oblivia, KrOyer, 1838, appears to be the earliest described species belonging to this genus, 

 but according to Hansen, Malacostraca marina Groenlandise occidentalis, p. 57, that 

 species is itself involved in great obscurity, since KrOyer states that he had but a single 

 specimen, and the single specimen in the Copenhagen Museum referred by KrOyer to this 

 species is only. Hansen says, a small Hyperia latreillei. On the other hand, he thinks 



