316 
ACTIXOPTEKYGTI. 
The following extinct species, not represented in the Collection, 
have also been described :— 
Tinea francofurtana, F. Kinkelin, Ber. Senckenb. naturf. Ges. 
[2] Yol. xvi. (1884), p. 255, pi. iii. fig. 13.—Lower Mio¬ 
cene ; iS’iederrad, near Frankfurt. [Pharyngeal teeth ; 
Senckenberg Museum.] 
Tinea ohtrnneata^ G. C. Laube, Abhandl. Yer. Lotos, vol, ii. (1900), 
p. 49, pi. 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 Cliondrostoma :— 
Chondrostoma elongata, D. G. Kramberger, Bad Jugoslav. Akad. 
’ '^ol- Ixxii. (1885), p. 39, pi. ii. figs. 2, 3, and Soc. Hist. 
^ ISTat. Croatica, vol. i. (1886), p. 133.—Upper Oligocene ; 
Y'arnsdorf, Bohemia. [Imperfect fish.] 
Genus RHODSUS, Agassiz. 
[Mem. Soc. Sci. Yat. Xeuchatel, vol. i. 1835, p. 37.] 
Mouth subinferior. Pharyngeal teeth in single series, compressed, 
not denticulated, the bevelled surface with a simple groove. Xo 
barbels. Pseudobranchiae present. Dorsal fin short and deep, 
without bony spine, opposed to space between pelvic fins and anal 
fin, or partly opposite latter; anal fin longer than deep, with 12 or 
more rays ; caudal fin forked. Scales large or of moderate size; 
lateral line incomplete, only on anterior part of trunk. 
Rhodeus elongatus, Agassiz. ^ ( 
1832. jRhodeus eloi^gatus, L. Agassiz, Neiies Jahrb. p. 134 (name only). 
1835-39. Rhodens ehngatus, L. Agassiz, Poiss. Foss. vol. v. pt. ii. 
p. 40, pi. liv. figs. 4-6. 
1861. Rhodens oligactinms, T. C. YTnkler, Descript. Poiss. Foss. 
d’Oeningen (Xatimrk. Verhandl. Holland. Maatsch. [2] vol. xiv.), 
p. 25, pi. iv. fig. 10. [Imperfect distorted fish ; Teyler Museum, 
Haarlem.] 
1861. Rhodens ehngatus, T. C. Winkler, ibid. p. 29. 
Tgpe. Imperfect fish; olim Lavater Coll., Zurich. 
A very small species, attaining a length of about 0’05. Length 
of head with opercular apparatus about equal to the maximum 
depth of the trunk and slightly less than one third of the length 
to the base of the caudal fin. Yertebrae 18 in the abdominal, 17 
in the caudal region ; 13 pairs of ribs. Dorsal fin completely in 
advance of anal, with 10 rays, of which the foremost is a short spine, 
