TEMPERATE NORTH ATLANTIC. 265 



fauna, viz. that of Japan. The number of genera common 

 to the Mediterranean district and the Japanese coasts is 

 larger than that of the genera common to the Mediterranean 

 and the opposite American coasts. 



The Chondropterygians found in the British district con- 

 tinue in tlie Mediterranean, their number being increased by 

 Centrina, Spinax, Pteroplatea, and some species of RMnobatus, 

 a genus more numerously represented in the Tropics. Tor- 

 pedo and Trygon are common. 



The greatest variety belong to the Acanthopterygians, as 

 will be seen from the following list -.—Lahrax ; Anthias, 

 Serra7ius, Polyprion, Apogon, Fomatomus, Pristipoma, Dia- 

 gramma (an Indian genus with two Mediterranean species, 

 and otherwise not represented in the Atlantic), Dentex, Mccna, 

 Smarts ; Mulhis ; Cantharus, Box, ScatJiarxs, Ohlata, Sargus, 

 Pagrus, Pagellus, Chrysophrys ; Sebastes, Scorpcena ; Hoplo- 

 stcthus, Beryx, Polymixia ; Trigla, Lepidotrigla, Agonus, 

 Peristethus ; Tracliinus, Uranoscopus ; Umh-ina, Sciccna ; 

 Sphyrccna ; Aphanopus, Lepidopus, Nesiarchus, Trichiurus, 

 Thyrsites ; CuMceps ; Zeus, Cyttus ; Stromateus ; Trachurus, 

 Caranx, Capros, Diretmus, Antigonia ; Callionymus ; Ba- 

 trachus ; Lophius ; Cristiccps, Tripterygium ; Cepola ; Lcpa- 

 dog aster ; Centriscus ; Notacantlius. 



The Lahridoi are as common as, or even more so 

 than, in the British district, and represented by the same 

 genera. But, besides, some other Pharyngognaths, properly 

 belonging to the Tropical Atlantic, have fully established 

 themselves, though only by a few species, viz. Glyphidodon 

 and Heliastes ; Cossyphus, Novacula, Julis, Coris, and Scar us. 



The Gadoids show a marked decrease of development ; and 

 the species of Gadus, Gadicidus, Mora, Strinsia, Phycis, and 

 Molva, which are peculiar to the Mediterranean, seem- to 

 inhabit rather the colder water of moderate depths, than the 

 surface near the shore. Motella, however, proves to be a true 



