CATALOG OF FOSSIL FISHES IN THE CARNEGIE MUSEUM 383 
with the Zeide, from which it differs in the smaller number of vertebrae (10+14), 
and in having the dorsal and anal spines more reduced, adnate, and continuous 
with the series of soft rays. Ventral fins with one spine and eight soft rays. This 
fish, according to the author just mentioned, appears to realize in every respect 
Fia. 4. Amphistium paradorum Agassiz. Upper Eocene, Monte Bolea, Italy. Restored after Boulenger. 
About one half natural size. 
the prototype of the Pleuronectide before they had assumed the asymmetry which 
characterizes them as a group. No examples of Amphistiwm are contained in 
the collection. 
Family PLEURONECTID. 
This family first appears in the Upper Eocene of Monte Bolea, but no extinct 
genera are recognizable. Modern Flat-fishes form a large group of some 500 
species, mostly marine, but a few species related to the Soles are confined to fresh 
water. 
Genus Ruomsus (Klein) Cuvier. 
48. Rhombus minimus Agassiz. (Plate XCVI, fiz. 3.) 
1796. Pleuronectes quadratulus G. §S. Volta, Titiolit. Veronese, p. 260, pl. 
LXIII, fig. 3 (errore). 
1835. Rhombus minimus L. Agassiz, Neues Jahrb., p. 301 (name only). 
1839-42. Rhombus minimus L. Agassiz, Poiss. Foss., Vol. IV, p. 289, pl. XXXIV, 
mee, 1h 
1859. Rhombus minimus A. B. Massalongo, Specimen Photogr. Anim. Foss. 
Agr. Veron. (1859), p. 36, pl. XIII, fig. 1. 
1901. Rhombus minimus A. 8. Woodward, Brit. Mus. Cat. Fossil Fishes, Pt. IV, 
p. 607. 
Type.—Nearly complete fish; Paleontological Museum, Munich. 
