Fishes . is Teuthis, characterized by the presenceon each side of the tail of a sharp, knife-like, movable spine•with the point turned forwards and dropping into a spine gives these fishes their name of surgeon-fish, doctor- The Squamipinnes 619 fish, lancet-fish, tang, barbero, etc., and it forms a very effectiveweapon against fish or man who would seize one of thesecreatures by the tail. The species have the center of distributionin the East Indies and have not reached Europe. Three speciesare found in the West Indies. The blue tang (Teutliis ccvruletis)is chiefly bright blue. Th
Fishes . is Teuthis, characterized by the presenceon each side of the tail of a sharp, knife-like, movable spine•with the point turned forwards and dropping into a spine gives these fishes their name of surgeon-fish, doctor- The Squamipinnes 619 fish, lancet-fish, tang, barbero, etc., and it forms a very effectiveweapon against fish or man who would seize one of thesecreatures by the tail. The species have the center of distributionin the East Indies and have not reached Europe. Three speciesare found in the West Indies. The blue tang (Teutliis ccvruletis)is chiefly bright blue. The common tang, Teutliis chirurgus, isbrown with bluish streaks, while a third species, Teutliis bahi-anus, has a forked caudal fin. Very close to this species isTeutliis cresionis, of the west coast of Mexico, and both areclosely related to Teutliis matoides, found from India to trtostegus, of Japan and Polynesia and the EastIndies, is covered with cross-bands alternately black and --c^^.^^^gl^ Fig. 513.—Brown Tang, Teuthis hahianus (Ranzani). Tortugas, Fla. In Hawaii this is replaced by the very similar Teutliis saiid-wicliensis. Many species are found about Hawaii and the otherPolynesian Islands. Teutliis achilles has a large blotch of bril-liant scarlet on the tail, and Teuthis olivaceus a bright-coloredmark on the shoulder. Teuthis lineatus, yellow with bluestripes, a showily colored fish of the coral reefs, is often poison-ous, its flesh producing ciguatera. Zebrasoma differs from Teuthis in having but 4 or 5 dorsalspines instead of 10 or 11. In this genus the soft dorsal fin is veryhigh. Zebrasoma fiavescens, sometimes brown, sometimes bright 620 The Squamipinnes yellow, is common in Polynesia; Zebrasoma veliferiim, cross-barred with black, is also common. CtenochcEtus (strigosus), unlike the others, is herbivorous andhas its teeth loosely implanted in the gums. This species, blackwith dull orange streaks, was once tabu to the king of Hawaii,who
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