MFRJ5NID2E. 
347 
!*• 8952-53. Two portions of similar immature fishes ; Monte 
Bolea. CastiUi Coll. 
P- 8951. Immature fish with very small head, apparently of the 
form named Leptocephalus medius by Agassiz, without 
definition (Neues Jahrb. 1835, p. 307); Monte Bolea. 
A similar fish seems to be figured under the name of 
Murctna caca by Volta, op. cit. pi. liii. fig. 2. 
Castelli Coll. 
The following species have not been defined and are not repre- 
sented in the Collection : — 
Ophisurus uruticaudvs , L. Agassiz, Neues Jahrb. 1835, p. 307 
(name only). Murcrnu opliis, G. S. Volta, Ittiolit. Vcroneso 
(1796), p. cliv: pi. xxiii. fig. 1 (errors ). — Upper Eocene ; 
Monte Bolea. 
Splutgebranchus formosissimm , L. Agassiz, loc. cit. 1835, p. 30, 
(name only). Oplndium burbatum, G. 8. 1 olta, op. cit. 
(1796), p. clvii. pi. xxxviii. fig. 1. — Upper Eocene; Monte 
Bolea. 
Ihe otolith described as follows seems to belong to this family. 
Otolithus (Conger is) brevior , E. Koken, Zeitschr. deutsch. geol. 
Ges. vol. xl. (1888), p. 293, pi. xviil. fig. 7. — Lower ter- 
tiary ; Jackson River, Mississippi. 
Suborder VII. PERCESOCES. 
^ ertebral centra always complete constricted cylinders, none 
coalesced. Supraoccipital extending forwards between the reduced 
parietals; squamosal rudimentary and fused with the large pteroth , 
Mandible simple, each ramus consisting only of two elements (dentary 
an d articulo-angular), rarely with a supplementary bone in the 
Position of the eoronoid. Pectoral arch suspended from the 
cranium ; precoracoid arch absent ; infraelavicular plates absent ; 
Pectoral fin with not more than four or five basals. Pelvic fins 
abdo m in a i ; their supports never in contact with the clavicle. 
Borsal fin with or without an anterior spinous portion. In the 
llvi ng forms— air-bladder closed, without pneumatic duct, in the 
adult (phjsoclystous) ; optic nerves decussating ; intestine without 
spiral valve. 
Bor notes on the osteology of existing members of this suborder, 
Sf e E. C. Starks, Proc. U.S. Nat. Mus. vol. xxii. (1899), pp. 1-10, 
I*ls. i.-ijfi 
