338 MR. F. B. BEDDARD ON THE ISOPODA COLLECTED [May 20, 



Crozets, and Kerguelen), the shores of New Zealand (?) and some ot 

 the adjacent islands, and the southern and eastern coasts of Australia. 

 The different species hare a more or less restricted area of distribu- 

 tion. Seven species (Serolis paradoxa, Serolis schythei, Serolis 

 gaudichaudii, Serolis plana, Serolis convexa, Serolis serrei, Serolis 

 trilobitoides) are found in Patagonia and the Falkland Islands. Of 

 two of these Patagonian species, Serolis schythei and Serolis para- 

 doxa, there are specimens in the British Museum labelled " New 

 Zealand," but I believe that this locality is not authenticated beyond 

 a doubt. Three species, Serolis cornuta, Serolis septemcarinata, and 

 Serolis latifrons, are found at Kerguelen. Of these Serolis latifrons 

 has also been obtained at Possession Island, and at the Auckland 

 Islands south of New Zealand ; Serolis cornuta is a very close ally of 

 Serolis trilobitoides, if not identical with it ; S. septemcarinata is 

 common to all three groups — Kerguelen, the Crozets, and Marion and 

 Prince Edward's Islands. The six species that occur on the shores 

 of Australia are, as has already been pointed out, distinguished by 

 certain characters which unite them together and differentiate them 

 from the other species of the genus. 



These facts agree with what is known about the distribution of 

 many other shallow-water animals. As a rule, there appears to be a 

 close resemblance between the faunas of New Zealand, Kerguelen, 

 and S. America, while the Australian species do not present such 

 resemblances to the New-Zealand species as might perhaps be 

 expected from the close proximity of the two regions. 



The deep-sea species of Serolis have a wider range than the 

 shallow-water species, although none have as yet been obtained north 

 of the equator. Serolis antarctica ranges from off Pernambuco to 

 the neighbourhood of the Crozets. Two other species, Serolis gracilis 

 .and Serolis necera, were obtained in deep water off the coast of S. 

 America, the former at Station 120 just below the equator, and the 

 latter at Stations 318 and 320 further south, off Buenos Ayres. Serolis 

 bromleyana was dredged at Station 156, close to the Antarctic ice- 

 barrier, and again considerably to the north off the coast of New 

 Zealand and between New Zealand and Australia. The compara- 

 tively wide distribution of Serolis bromleyana and S. antarctica is 

 interesting, and agrees with what is known respecting the geogra- 

 phical distribution of other deep-sea animals. 



The greatest depth which this genus is known to inhabit is 2040 

 fathoms ; a single specimen of Serolis necera was dredged from this 

 depth at Station 31 8. Serolis bromleyana w as dredged in 1975 fathoms 

 at Station 186, and in 1 100, 700, and 410 fathoms in the neighbour- 

 hood of New Zealand; Serolis antarctica ranges from 400 to 1600 

 fathoms. Serolis gracilis vf as only dredged at one locality, and from 

 675 fathoms. Gerstaecker, in his account of the Isopoda in Bronn's 

 ' Thierreich,' points out that many species which have a wide distri- 

 bution are found in deeper water as they pass southwards from the 

 equator to the pole, and instances (from v. Willemoes Suhm's 

 Preliminary Report on the Crustacea, etc., Proc. Roy. Soc, 1874) 

 Serolis bromleyana and another species which I have named Serolis 



