438 
GEOGRAPHICAL ZOOLOGY. 
[PART. IV. 
these, except the last, are confined to the Mediterranean and the 
Atlantic as far as Madeira. Eight other genera are characteristic 
of the Atlantic, most of them being West Indian, but one from 
the coasts of North America. Seven genera are common to all 
the great oceans ; the remainder being confined to the Indian 
and Pacific Oceans, ranging from Japan to New Zealand, but 
being far more abundant between the Tropics. 
Family 50.— EMBROTOCIDiE. (2 Genera, 17 Species.) 
“Marine viviparous fishes, with compressed elevated bodies 
covered with cycloid scales, and with small teeth.” 
Distribution. — Pacific Ocean from Japan and California 
northwards. One species enters the fresh waters of California. 
Family 51. — GERRIDiE. (1 Genus, 28 Species.) 
“ Marine fishes, with compressed oblong bodies covered with 
minutely serrated scales, and with small teeth.” 
Distribution. — Tropical seas; ranging south as far as the 
Cape of Good Hope and Australia, and north to Japan and 
(one species) to New Jersey, U.S. 
Family 52. — CHROMIDiE. (19 Genera, 100 Species.) 
“ Fresh-water herbivorous or carnivorous fishes, with elevated 
or elongate scaly bodies, and small teeth.” 
Distribution. — The Oriental, Ethiopian, and Neotropical re- 
gions. 
Eutroplus (2 sp.) is from the rivers of Southern India and 
Ceylon; Ghromis (15 sp.), Sarotherodon (2 sp.), and Hemi- 
chromis (4 sp.), are from the rivers and lakes of Africa, ex- 
tending to the Sahara and Palestine. The remaining 15 genera 
are American, and several of them have a restricted distribution. 
Aeara (17 sp.) inhabits Tropical South America and the 
Antilles ; Theraps (1 sp.), Guatemala ; Hews (26 sp.), Texas and 
