316 
ACTINOPTER YG1 1. 
The following extinct species, not represented in the Collection, 
have also been described : 
Tinea francofurtana, F. Kinkelin, Ber. Senckenb. naturf. Ges. 
[2] vol. xvi. (1884), p. 255, pi. iii. fig. 13 .— Lower Mio- 
cene ; Niederrad, near Frankfurt. [Pharyngeal teeth , 
Senekenborg Museum.] 
Tinea oltruncata, G. C. Laube, Abhandl. Yer. Lotos, vol. ii.(19°0), 
P* 49, pL iv. fig. 1. — Miocene ; Bohemia. [Imperfect 
fish ; Teplitz Museum.] 
The following extinct species, not represented in the Collection, 
is supposed to belong to the existing genus Chondrostoma : — 
Chondrostoma elonrjata, I). G. Krambergcr, Bad Jugoslav. Akad. 
vol. lxxii. (1885), p. 39, pi. ii. figs. 2, 3, and Soc. Hist. 
Nat. Croatica, vol. i. (1886), p. 133. — Upper Oligocenc . 
Warnsdorf, Bohemia. [Imperfect fish.] 
Genus RHODEUS, Agassiz. 
[Mem. Soc. Sci. Nat. Neuchatel, vol. i. 1835, p. 37.] 
Mouth subinferior. Pharyngeal teeth in single series, compressed, 
not denticulated, the bevelled surface with a simple groove. *' 0 
barbels. Pseudobranchifc present. Dorsal fin short and deep, 
without bony spine, opposed to space between pelvic fins and ana 
fin, or partly opposite latter ; anal fin longer than deep, with 1 2 01 
more rays ; caudal fin forked. Scales largo or of moderate size , 
lateral line incomplete, only on anterior part of trunk. 
Rhodeus elongatus, Agassiz. 
1860. Rhodeus elongatus, L. Agassiz, Neues Jahrb. p. 134 (name only )• 
1835-39. Rhodeus elongatus, L. Agassiz, I’oiss. Foss. vol. v. P*- 
p. 40, pi. liv. figs. 4-6. 
1861. Rhodeus oligactinius, T. C. Winkler, Descript. Poiss. F 09 ®- 
d’Oeningen (Natuurk. Verhandl. Holland. Maatsch. [2] vol. xlV ’ ’ 
p. 25, pi. iv. fig, 10. [Imperfect distorted fish ; Teyler Museun , 
Haarlem.] 
1861. Rhodeus elongatus, T. C. Winkler, ibid. p. 29. 
Type. Imperfect fish ; olim Lavater Coll., Zurich. 
A very small species, attaining a length of about 0'05. Lengt 
of head with opercular apparatus about equal to the maxim 111 ' 1 
depth of the trunk and slightly less than one third of the len^t 
to the base of the caudal fin. Vertebra) 18 in the abdominal, 1< 
in the caudal region ; 13 pairs of ribs. Dorsal fin completely m 
advance of anal, with 10 rays, of which the foremost is a short spine, 
