ACKONURID.®, 
563 
Aulorhamphus canossoc : Acanthurus canossce, J. J. Heckel, 
Denkschr. k. Akad. Wiss., math.-naturw. Cl. vol. xi. pt. i. 
(1856), p. 258, pi. xii. figs. 6, 7 ; A. B. Massalongo, 
Specimen Photogr. Anim. Foss. Agr. Veron. (1859), p. 25, 
pi. vii. fig. 2. Calamostoma canossce, F. Steindachner, 
foe. cit. 1863, p. 133. — Ibid. [Imperfect fish ; Court 
Museum, Vienna.] 
Aulorhamphus capellinii, A. de Zigno, loc. cit. 1887, p. 23, fig. 5. 
—Ibid. [Imperfect fish; Zigno Coll., University of 
Padua.] 
Genus APOSTASIS, Kramberger. 
[Rad Jugoslav. Akad. vol. cvi. 1891, p. 104.] 
An imperfectly known extinct genus, comprising small species 
■with snout not much produced and teeth simply conical. Pre- 
operculum serrated. Spinous portion of dorsal fin more developed 
than articulated portion. Scales with thickened hinder border 
bearing few stout spines ; no caudal spines. 
The following species have been described but are not represented 
in the Collection : — 
Apostasis croatica, 1). G. Krambergor, ltad Jugoslav. Akad. 
vol. cvi. (1891), p. 106, pi. iii. fig. 1. Acanus croaticus, 
D. G. Kramberger, loc. cit. vol. lxxii. (1885), p. 60.— 
Upper Miocene; Podsused, Croatia. [Tho type species, 
supposed to have 6 or 7 articulated rays in pelvic fins but 
uncertain. Imperfect fish ; Geological Museum, Univer- 
sity of Agram.] 
Apostasis sturi, D. G. Kramberger, loc. cit. vol. cvi. (1891), p. 106. 
Acanus sturi , D. G. Kramberger, Jahrb. k. k. geol. Reichs- 
anst. vol. xxx. (1880), p. 566, pi. viii. fig. 1. — Middle 
Oligocene ; Wurzenegg, near Prassberg, Steiermark. 
Genus ACANTHURUS, Forskal. 
[Descr. Anim. 1775, p. 59.] 
Teeth lobate and denticulated. Spinous portion of dorsal fin less 
extended than articulated portion; anal fin with 3 spines. All 
scales minute and ctenoid, sometimes spiny; one erectile spine on 
each side of the caudal pedicle. 
The skeleton of Acanthurus triostegus is described by A. Gunther, 
Catal. Fishes B. M. vol. iii. (1861), p. 327. 
2o 2 
