1908.] GENUS OF AMPHIPOD CRUSTACEA. 375 



The South African specimens are males, 10-13 mm. in length, 

 from Buffalo Bay— one taken in 32 fathoms S.W. by W. | W., 

 3^ m., and the others in 47 fathoms, lat. 33° 9' 30" S., long. 28° 3' 

 00" E. 



In the following " Description of Species," the specimens 

 described are : — 



One large ovigerous female, T. nicceense, 23 mm. long, taken 

 by Dr. Allen, 26.viii.06, on the ' Huxley ' in the Bay of Biscay, in 

 246 fathoms; lat. 48° 7' N., long. 8° 13' W. ; Agassiz trawl. 

 Free - swimming . 



And seven specimens taken by Mr. W. M. Tattersall on the 

 ' Helga,' as follows : — 



7.viii.l904. Four specimens, T. nicceense : three females, re- 

 spectively 20, 20'5, and 22 nnn. long, and one male, 21-5 mm., 

 the first male recorded out of the Mediterranean. 50 miles 

 W.]Sr.W. of Tearaght, Co. Kerry, Ireland, 396 fathoms. jSTet at 

 237 fathoms. Free-swimming. 



5.xi.l905. One specimen, T. nicceense, a male, 20 mm. long, 

 50 miles W. f IST. of Tearaght, Co. Kerry, Ireland, 411 fathoms. 

 Net at 75 fatlaoms. Free-swimming. 



February 1906. One specimen, T. nicceense, a male, 21"5 mm. 

 Lat. 51° 54' N., long. 11° 54' W., 460 fathoms. Net at 350 

 fathoms. Free-swimming. 



August 1906. One specimen, T. raschii, immature female, 9 mm. 

 Lat. 50^ 37' N., long. IT 12' W., 250-542 fathoms. Taken in a 

 small net attached to the trawl. This is the first record of this 

 species out of Norwegian waters. 



II. Description of Species. 



Only three species of this genus are known so far : T. nicceense, 

 recorded from Naples, Genoa, Nice, the Bay of Biscay, and the 

 west coast of Ireland, of which the male and female have both 

 been taken ; T. raschii, ranging from the Arctic Circle to 

 Christianiafjord, Norway, and from the west coast of Ireland, 

 only the female and young of this species are known ; and 

 Mr. Stebbing's new South African species, of which the male only 

 has been captured. 



Detailed descriptions and figures of the first two species are 

 given here to prove the justice of their inclusion in the same 

 genus. 



1. Trischizostoma NiciEENSE (Oosta). (Plates XIV., XY., 

 XYL, XYII. figs. 1-12, PL XIX. fig. 1, and PI. XXI. fig. 14.) 



Syn. 1853. Giberinia nicceensis Hope in litt., Costa (1). 

 1893. Guerinci nicceensis Delia Yalle (15). 



1905. Guerinellct nicceensis Chevreux (18). 



1906. Trischizostoma nicceense, S , Stebbimg (19). 



Both the male and the female of this species are known. The 

 male has been figured by Delia Yalle, but no accurate figure of 



