62 
ACTIXOPTERYGII. 
* 
Lower Hawkesbury-Wianamatta Series ; Gosford, New 
South Wales. [Trunk, wanting head ; Geological Survey 
Museum, Sydney.] 
Semionotus elongatus, 0. Fraas, Wiirtt. Jahresh. vol. xvii. (1861), 
pp. 93, 95, pi. i. figs. 4, 5jL-Middle Keuper; Stuttgart. 
[Distorted fish ; Stuttgart Museum.] 
Semionotus gibbus , K. von Seebach, Zeitschr. deutsch. geol. Ges. 
vol. xviii. (1866), p. 7 ( gibber , errore) ; W. Deecke, Palae- 
ontogr. vol. xxxv. (1889), p. 105.—Bunter Sandstone ; 
Bernburg, Anhalt. [Fragmentary trunk ; University 
Geological Museum, Gottingen.] 
Semionotus gibbus , F. Bassani ( non SeebaclC, Atti Soc. Ital. Sei. 
Nat. vol.xxix. (1886), p. 3^—Triassic; Besano, Lombardy. 
[Nearly complete fish; Milan Museum.] 
Semionotus letticus, 0. Fraas, Wiirtt. Jahresh. vol. xvii. (1861), 
p. 97, pi. i. fig. —Upper Triassic (Lettenkohl ); Hoheneck, 
Wiirtemberg. [Imperfect fish; Stuttgart Museum.] 
Semionotus nilssoni, L. Agassiz, Poiss. Foss. vol. ii. pt. i. (1837), 
o/c/s^<f p, 229, pi. xxvii a. figs. 1-5 ; B, Lundgren, Kongl. Fysiogr. 
f Sallsk. Minneskr. 1878, no. v. p. 32, pi. ii. fig. 79.—Bhaetic: 
■ Hoeganaes, Sweden. [Head and anterior portion of trunk ; 
Museum of Comparative Zoology, Cambridge, Mass., U.S.A.] 
Semionotus serratus , 0. Fraas, Wiirtt. Jahresh. vol. xvii. (1861), 
p. 97, pi. i. 'fig. 7 j —Middle Keuper ; Hiitten, Wiirtem- 
berg. [Anterior portion of fish; Stuttgart Museum.] 
(? Coloboclus.) 
Fragments of Semionotus have also been described from the Upper 
Keuper of Colwick Wood, Nottingham (E. T. Newton, Quart. Journ. 
Geol. Soc. vol. xliii. 1887, p. 539, pi. xxii. fig. 8), and from the 
Bunter Sandstone of Inzlingen, near Basle, Switzerland (W. Deecke, 
Palseontogr. vol. xxxv. 1889, p. 104, pi. vi. fig. 7 : Basle Museum); 
and the present writer has examined characteristic specimens from 
the Bhaetic probably of Bur Crowcombe (Bath Museum) and Haps- 
ford Mill, Yallis, Somersetshire. 
Nearly complete fishes, variously crushed and distorted and some¬ 
times imperfectly preserved, have been described from the Trias of 
North America under the following names. They may be con¬ 
veniently referred to the genus Semionotus , and doubtless represent 
much fewer species than are here enumerated :— 
Ischypterus agassizi , Sir P. Egerton, Quart. Journ. Geol. Soc. 
vol. vi. (1850), p. 10; J. S. Newberry, Foss. Fishes Trias. 
