THE MARINE FAUNA OF THE FALKLAND ISLANDS. 83 



regions as well as the tropics, but the species of this genus appear to 

 be very limited in their distribution. The depths vary from to 700 

 fathoms. 



Edotia. The distribution of this genus appears to be somewhat 

 doubtful. A species, E. bicuspida, occurs in the Arctic seas. I have 

 been unable to ascertain if the genus is represented in the tropics. 



Sphceroma. The genus appears to be almost universally distributed 

 over the temperate and tropical areas, but the species appear to have 

 a very limited distribution. 



Orchestra. The genus appears to be cosmopolitan in temperate 

 and tropical littoral waters ; the species of this genus, like those of 

 other genera in this collection, are limited in their distribution. 



Regarding the seven genera represented in this collection : three 

 (Eupagurus, Sphceroma, and Orcheslia) • are widely distributed in 

 temperate and tropical waters ; one (Xautho) is cosmopolitan ; one 

 (Paralomis) has been recorded from the north and south temperate 

 regions, but not from the tropics. One (Halicarcinus) is confined to 

 the southern hemisphere: and the distribution of one (Edotia) is 

 doubtful. 



The distribution of the genus Paralomis in northern and southern 

 temperate seas, but not in the tropics, cannot be said to support 

 Murray's view, for I do not think this genus has been recorded as 

 occurring fossil. The tendency of this genus to retire into deep water 

 might be said to support Ortmann's view, but there is not much 

 evidence to turn the balance in favour of either one or the other. 



There appears to be no evidence among the representatives of 

 Crustacea in this collection of a passage from one temperate zone to 

 the other, along the west coasts of America or Africa. 



-TUNICATA. 



ASCIDLE SlMPLICES. 



Boltenia legumen Lesson, Centurie Z oologique, 1830, p. 149; 

 Challenger, Vol. VI., Tunicata, p. 88. Habitat: Falk- 

 lands, and southern extremity of South America. 



The genus appears to be specially characteristic of north and south 

 temperate seas, but has not, I think, been recorded from the tropics. 



