GEOGRAPHICAL DISTRIBUTION OF CRUSTACEA. 1579 



cold temperate than subtemperate regions of the Australian and New 

 Zealand Seas. Portunus integrifrons is reported from Tasmania (Van 

 Diemens Land). Ozius represents Xantho of the British Channel. 



ARCTIC AND ANTARCTIC KINGDOMS. 



With our existing knowledge of species, the Arctic and Antarctic 

 kingdoms widely differ ; but much of this difference may be owing to 

 the greater extent of land in the northern kingdom, and not a little 

 to our limited knowledge of the latter. In the Arctic Frigid zone, 

 there are the following genera of Podophthalmia : Eyas 1 species, 

 Stenorhynchus 1, Cancer 1, Portunus 1, Carcinus 1, Lithodes 2, Bern- 

 hardus 3, Galathcea 2, Crangon 2, Sabinea 1, Argis 1, Hippolyte 18, 

 Pandalus 3, Palcemon 1, Thysanopoda 3, Mysis 3, Mi/to 1. Out of 

 these, only Lithodes and GalatJiea are at present known to occur in 

 the Antarctic kingdom, and as yet we are not certain that either 

 reaches beyond Fuegia, near the limits of the subfrigid and frigid 

 regions: further researches are required. The Thysanopoda of the 

 north are represented in the south by a species of Euphausia. 



Among the Tetradecapoda, the following exist in the Arctic king- 

 dom : IDOT^EIDEA, Idotcea, 9 species, Glyptonotus 1 ; ONISCOIDEA, Lygia, 



1, Jcera 2, Jceridina 1, Asellus 1, Janira 1, Henopomus 1, Munna 1 ; 

 of CYMOTHOIDEA, JEga 3 ; SEROLIDEA, Praniza 1, Anceus 1 ; TANAIDEA, 

 Tanais 6, Crossurus 1, Bopyrus 1, Phryxus 2, Dajus 1 ; of CAPREL- 

 LIDEA, Proto 2, Caprella 6, JEgina 2, Cercops 1, Podalirius 1 ; GAMMA- 

 RIDEA, Dulichia 1, Siphoncecetes 1, Unciola 1, Laphystius 1, Orchestia 



2, Stegocephalus 1, Anonyx 2, Leucoihoe 2, Acanthonotus 3, Iphimedia 

 14, (Edicerus 1, Gammarus 13, Pliotis 1, Melita 2, Pardalisca 1, ^c%- 

 rocerw 2, Microcheles 1, Lepidactylis 1, Pontiporeia 1, Ampelisca 1, 

 Protomedeia 1, Pliaxus 1 ; HYPERIDEA, Lestrigonus 1, Hyperia 1, Metcecus 

 1, Themisto 2. 



From the Antarctic kingdom, there are at present known, Glypto- 

 notus 1, Idotcea 1, Cirolana 1, Serolis 1, Uristes (related to Anonyx) 1 ; 

 of HYPERIDEA, Cyllopus 1, Tauria 1, Themisto 1 ; and if we add South- 

 ern Fuegia, Eurypodii 2 or 3, Halicarcinus 1, Munida 1, Grimoihea 

 1, LitJwdes 3, Tylus 1, Oniscus 1, Styloniseus 1, Jcera 1, Plerelas 1, 

 Spheroma 3, Serolis 3, Anonyx 1, Amphithoe 1, Gammarus 1, etc. The 

 contrast is again very striking. Serolis and some allied forms, with 

 Glyptonolus are the most characteristic of southern Isopoda, and 4he 



