On the Classification of Teleostean Fishes. 295 Supplementary Notes. Saltavatin^. Ltsarda inornata. Acanthaspis inornata, Walk. Cat. Het. vii. p. 175. n. .51 (1873). Lisarda pallidispina, StSl, En. Hem. iv. p. 83 (1874). A CANTHASPJN.^.-Genus Pasira. Pasira perpusiUa. Heduvius perpitsillus, Walk. Cat. Het. vii. p. 19G. n. 50 (1873). Pasira pusilla. Reduvius jmsillus, Walk. Cat. Het. vii. p. 193. n. 43 (1873). Clavus, base of corium, a linear spot near centre of apical margin of corium, spots to connexivum, and extieme apices of anterior femora obscure brownish ochraceous. XLII. — Notes on the Classification of Teleostean Fishes. — IV. On the Systematic Position of the Pleuronectidse. By G. A. BOULENGER, F.R.S. In the classification of Cuvier, at the beginning of the last} century, the presence or absence of spines in the dorsal fin was regarded as of so great importance in the Teleostean fishes that they were primarily divided into Acanthopterygians and Malacopterygians. According to the presence or absence and the position of the ventral or pelvic fins, the latter division was again split up into three groups — Abdominals, Sub-brachials, and Apodes. The Gadoids and Pleuronectids were thus brought together as Subbrachial Malacopterygians. When Johannes Miillcr took up the condition of the air-bladder as a basis for the establishment of higher groups, these Subbrachial Malacopterygians were removed from the Abdominals or Physostonies and placed nearer the Acantho-pterygians, but remained associated under the name Anacan-thini. And so they have been in most classifications, even modern text-books teaching us that flat-fishes are only modified asymmetrical Gadoids. But any one who will carefully compare the anatomical structure of the principal members of these two families cannot fail to recognize the absurdity of
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