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Show 1906.] FRESH-WATER FISHES OF TRINIDAD. 391 The male is a very elegant little fish and varies considerably in colour and marking. " Colour: Male olivaceous, silvery below ; a dark longitudinal stripe from eye to middle of side, another on the posterior part of the body; usually two to four blackish spots, including one at each end of the posterior stripe; these may be accompanied by reddish spots. Female olivaceous, silvery below, without spots'or stripes." 27. DORYICHTHYS LINEATUS Kaiip. Hab. Atlantic Coasts and Rivers of Tropical America, the African D. aculeatus being apparently distinct. 28. AGONOSTOMUS MONTICOLA Bancroft. Hctb. Fresh-waters of the West Indies (Jamaica, Barbados,. St. Vincent, Dominica, Trinidad) and of Mexico. 29. MUGIL BRASILIENSIS Ag. Hab. Cuba to Patagonia. 30. MUGIL TRICHODON Poey. Hab. Florida to Brazil. 31. CENTROPOMUS UNDECIMALIS Bl., and 32. CENTROPOMUS ENSIFERUS Poey. " These fishes, known as ' Broche,' ' Robalo,' or ' Snook,' were caught in the Caroni River, where they have been taken over 20 pounds in weight. They are marine, but go a long way up fresh-water streams in search of food. According to Mr. Pasea, they can be bred in artificial ponds or in large fresh-water pools that have no connection with the sea." Hab. Atlantic Coasts and Rivers of Tropical America. 33. POLYCENTRUS SCHOMBURGKII Mull. & Trosch. (Plate XXV. fig. 2.) " The ' King or Black Cascarob' is a very peculiar little fish, which, when alarmed, changes almost instantly from black to whitish or pinkish white, rapidly vibrates the pectoral fins, and, instead of running away, turns on one side and remains for a long time in a crouching position. They are uncommon, and were caught by means of a circular hand-net in the thick rank grass which grows at the sides of the ravines." Hab. Trinidad ; Venezuela; Guiana. 34. CRENICICHLA SAXATILIS L. " Name ' Mulet' (pronounced Mil-lay). Head olive or greyish green; eye with a dark crimson splash ; back dull olive and yellowish green, belly greyish or bluish grey ; pale green metallic spots on the sides often present, or if they be absent, blackish cross-bars ; sometimes a blackish longitudiral stripe; fins varying |