. Catalog of fossil fishes in the Carnegie Museum. Fishes, Fossil. 326 MEMOIRS OF THE CARNEGIE MUSEUM. 3. Urosphen attenuata sp. nov. 1911. Urosphen dubia Eastman, Mem. Carnegie Museum, Vol. IV, No. 7, p. 361, PL XCVI, fig. 2. Type.—Nearly complete fish; Carnegie Museum (Cat. No. 4499). A small species attaining a length of about 20 cm. having about the same pro- portions as the tjrpe of U. dubia, but more vertically compressed, and differing in the conformation of the caudal fin. This is intermediate in character between the caudal fin of U. dubia, which is cuneiform with all of the rays grad
. Catalog of fossil fishes in the Carnegie Museum. Fishes, Fossil. 326 MEMOIRS OF THE CARNEGIE MUSEUM. 3. Urosphen attenuata sp. nov. 1911. Urosphen dubia Eastman, Mem. Carnegie Museum, Vol. IV, No. 7, p. 361, PL XCVI, fig. 2. Type.—Nearly complete fish; Carnegie Museum (Cat. No. 4499). A small species attaining a length of about 20 cm. having about the same pro- portions as the tjrpe of U. dubia, but more vertically compressed, and differing in the conformation of the caudal fin. This is intermediate in character between the caudal fin of U. dubia, which is cuneiform with all of the rays gradually in- creasing in elongation above and below axially, or medianwards, and that of Fistu- lariids in which two axial rays are excessively elongated. The neural and haemal spines of the last vertebral centrum are expanded into fan-shaped laminae medially. Fig. 2. Tail of Urosphen attenuata Eastman. X h C. M. Cat. Foss. Fishes, No. 4499. in contact and together forming a urostyle,^ which supports in all six slender, greatly elongated and closely apposed caudal fin rays, half the number being epiaxial and half hypaxial (see Fig. 2). In addition, a series of ten short rays, increasing gradually in length from the anteriormost onwards until about the fifth, after which all are of uniform length, arise from the dorsal and ventral margins at the posterior extremity of the body, being supported by the neural and haemal spines of the last five vertebrae. The dorsal and anal fins are remote, similar, and opposite, the former with eighteen rays, and the latter with twenty. The trunk and head are vertically much com- pressed, and the small, terminal mouth is provided with minute conical teeth. In the type-specimen the undigested skeletal remains of a small teleost are seen in the forward part of the intestinal tract. The holotype has already been figured in the Memoirs (1911) under the name of U. dubia. ' Reference may be made here to the writings of R. H. Whitehouse (Proc. Roy. Soc,
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