360 PROCEEDINGS OF THE ACADEMY OF ON A NEW AMERICAN SPECIES OF PLEURONECTOID {GLYPTOCEPHALUS ACADIANUS). BY THEODORE GILL, M.D. In the " Proceedings of the Academy of Natural Sciences of Philadelphia" for 1864 (pp. 214-224), was published a "Synopsis of the Pleuronectoids of the eastern coast of North America," in which two generic t3'pes, either entirely new {Euchalarodus) or new to the coast ( Githarichthyii)^ were made known. The present article may be regarded as supplementary to that. The only known specimen of the new type was obtained from a pond at Eastport, Maine, during the month of August, by an attache (Di'. Edward Palmer) of the Commissioner of Fisheries (Prof. Baird), and, notwithstanding the assiduous attentions of the commissioner and his staff, no other specimens were found; it must, therefore, be actually a very rare fish, or (what is more probable in such cases) peculiar in its habitat, and rarely coming within the range of operations of the fisherman. An attentive examination and comparison of this species with the Glyptocephalus cynoglossus, of Europe, indicate that it is congeneric with that species and with the Platessa elongata of Yarrell, but more nearly allied to the latter. As the genus is now for the first time introduced into our fauna, a description of the characters common to all the species (generic), as well as distinc-tive of the new form (specific), is given. Genus GLYPTOCEPHALUS, Gottsohe. Synonymy. Olyptocephalus, Gottsohe, Arcliiv fiir Nat. 1835, i. p. 156; Blkr., Compt. Rend. Acad. Sci., Amsterdam, xiii., 1SG2. Body oblong fusiform, with the caudal peduncle abbreviated. Scales minute, oval, cycloid on the e3'ed as well as blind side, and regularl}' imbricated. Lateral line straight, with its scales covered on both sides by the adjoining ones. Head small, ovate, the profile being slightly decurved, and with the rostral area rhomboid; covered with minute imbricated scales on the cheeks and opercular bones ; on the blind side exhibiting
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