362 MEMOIRS OF THE CARNEGIE MUSEUM 
Suborder SOLENICHTHYES. 
This group is apparently related to the preceding (Thoracostei), but differs 
from it in that on each side a series of plates takes the place of the single dermal 
plate of the latter. There are two families, the Centriscide and Amphisilide. 
Family CEnTRISCIDA. 
Centriscus, with five species in the Atlantic and Pacific Oceans, represents 
the family at the present day. Isolated spines from the Pliocene of Tuscany have 
been referred to the same genus. Rhamphosus, from the Upper Eocene of Monte 
Bolca, is believed to have been allied to Centriscus. 
Genus RuampnHosus Agassiz. 
11. Rhamphosus aculeatus (Blainville). 
1796. Uranoscopus rastrum, G. 8. Volta, Ittiolit. Veronese, p. 22, pl. V, fig. 4. 
1796. Centriscus, G. S. Volta, ibid., pl. LX XV, fig. 1 (errore). 
1818. Centriscus aculeatus, H. D. de Blainville, Nouv. Dict. d’Hist. Nat., Vol. 
ROXGV eel 2350: 
1835. Rhamphosus aculeatus, L. Agassiz, Neues Jahrb., p. 291 (name only). 
1839-42. Rhamphosus aculeatus, L. Agassiz, Poiss. Foss., Vol. IV, p. 270, pl. 
DOA se 70 
1888. Rhamphosus aculeatus, L. Vaillant, Expéd. Scient. Travailleur et Talis- 
man—Poissons, p. 339. 
1898. Rhamphosus aculeatus, F. Bassani, Paleontogr. Italica, Vol. III, p. 82, pl. 
IX, fig. 4. 
1901. Rhamphosus aculeatus, A. 8. Woodward, Cat. Fossil Fishes Brit. Mus., 
PartelVe Dione 
Type.—Imperfect fish, Paris Museum of Natural History. 
This species is represented in the British Museum collections by a single im- 
perfect specimen, and in the Carnegie Museum by a complete head, including the 
attenuated and elongated snout, of a rather small-sized example. (Cat. No. 4213.) 
Suborder ACANTHOPTERYGI. 
This large and well characterized suborder, the most comprehensive of the 
whole class of Pisces, is commonly understood as embracing the Berycide and 
allied families, together with the Perciformes, Scombriformes, Kurtiformes, Jugu- 
lares, Gobiiformes, etc., of Boulenger. The removal of the berycoid fishes to form 
