328  ©REPORT OF COMMISSIONER OF FISH AND FISHERIES. [104] 
Lately the relations of these forms have been made the subject of 
careful study by Dr. Carlo Emery, Dr. Luigi Facciola, and others of ° 
the Italian naturalists, and no doubt remains that the ‘‘ Bibrontide” are 
larval flounders and soles. 
For the sake of completeness, we give the following analysis of the 
nominal genera and the synonymy of the species: 
ANALYSIS OF THE NOMINAL GENERA OF BIBRONIE OR LARVAL FLOUNDERS AND SOLES. 
a. Eyes wholly sinistral ; mouth toothless, shaped as in the soles; upper jaw hook- 
shaped; head very small; caudal fin subsessile, free from the dorsal and 
anal; scales small, caducous, cycloid; eyes small; pectoral fins both 
present, the right pectoral small; ventral fins both present, free from anal; 
dorsal fin of long, simple rays, their tips much exserted; body moderately 
elongate; the depth 3 in length; dorsal rays 100; anal rays 80. P. 12-4. 
DELOTHYRIS, A. 
aa. Eyes partly sinistral, the one on the left side, the other on the vertex (in the 
act of transition); form pleuronectoid....-....--...--..---- Cocco.vs, B. 
aaa. Eyes, one on either side of the head; strictly symmetrical (or with the right eye 
somewhat higher than the other), and with a notch before it, between the 
cranium and the dorsal fin. 
b. Vertical fins scarcely or not confluent; left ventral largest, on abdominal ridge. 
c. Body excessively compressed, broadly ovate, its depth 12 in its length; both 
profiles very convex; the snout not forming an angle; no scales; none of 
the dorsal rays prolonged ; ventral fin single (Facciold) ; pectoral fins short, 
rounded, with fleshy base and fringe-like rays; D. 85; A. 65. Jaws equal, 
RVC DUS sCUbeRDOeLN an cline oes anne alee aii emcee ee arene PELORIA, C. 
ce. Body more elongate; scales present or absent; pectorals adipose, with fringe- 
like rays. 
d. Ventral fin single ; first four rays of the dorsal well separated and with 
much exserted tips; dorsal and anal slightly joined to caudal; depth about 
At in Jenoth; D. 4; 1065 A. 100. (Emeny) - 22.21 5--5--56 ? CHARYBDIA, D. 
dd. Ventral fins both present, the left ventral with more prolonged base; 
dorsal with only the first ray (if any) prolonged; dorsal and anal free from 
caudal; depth 2} to2in length (Facciold)...-...-...----- CHARYBDIA, D. 
bb. Vertical fins fully confluent ; form lanceolate. 
e. Body linguiform, the depth 6 in length; no teeth; snout obtuse; eyes 
minute; ventral fins two; four or five of the dorsal ‘rays produced; pec- 
iorels pedunculate.. D905 4.80 (on ces peas ba ee = noes BrBRonia, E. 
ee. Body plagusiiform ; perfectly transparent.-....---..----- BASCANIUS, F. 
Synonymy of genera of larval Pleuronectide or Bibronia. 
Bibronia Cocco, ‘‘Intorno ad alcuni Pesci del mare di Messina. Lettera al Sig. 
Augusto Krohn da Livonia. In Giornale del Gabinetto & Lettere di Mes- 
sina. Ann. iii, tom. v, fase. xxv. Gennaio e febbraio 1844, pag. 21-30, tay. 
2” (fide Facciola) (ligulata). 
Peloria Cocco, 1. ¢. (heckeli). 
Coccolus (Bonaparte) Cocco, 1. ¢. eabeneas; 
Bascanius Schiddte, Naturhist. Tidsskr., v, 269, 1867 (tedifer). 
Thyris Goode, Proc. U.S. Nat. Mus., 1880, 344 (pellucidus : name preoccupied): 
Delothyris Goode, Proc. U.S. Nat. Mus., 1883, 110 (pellucidus). 
Charybdia Facciolad, Naturalista Siciliano, iv, 265, 1885 (riippelli). 
