1 78 Mr. A. S. Woodward on a 



Agassiz recognized six species — one from the Keuper and five 

 from the Lias; in 1843 Sir Philip Egerton described three 

 others from the Lower Jurassic of Italy, and in 1872 one from 

 the English Kimmeridge Clay ; a fourth Italian species was 

 added by Costa, and two additional Keuper forms have been 

 subsequently discovered — the one named by Dr. Oscar Fraas, 

 from Wiirttemberg, the other described by Mr. E. T. Newton, 

 from Warwickshire. 



Thirteen species have thus been referred to the genus under 

 consideration, and of these the position of three seems doubtful, 

 on account of the imperfection of known specimens, while a 

 fourth may be unhesitatingly regarded as wrongly so placed. 

 The three former are the Italian species described by Egerton, 

 and the smallest of these {8. minutus) may eventually prove 

 to be truly a Notagogus. The fourth species is the so-called 

 S. rliomhifer^ Agass. *, from the Lower Lias of Lyme Regis, 

 which Sir Philip Egerton has already recognized t as exhi- 

 biting a very close resemblance to Heterolepidotus. There 

 can, indeed, be no longer any doubt that the fish in question 

 belongs to the last-named genus, and the type specimen is 

 quite possibly a young individual of H. latus, Egerton. 



Tabulating the remaining twelve species, it will be con- 

 venient for reference to place them in stratigraphical order 

 as follows ; and to those of which the type specimens are now 

 preserved in the British Museum an asterisk is prefixed. 



Semionotus, Agassiz. 



Semimiottis Bergeri, Agass. Rech. Poiss. Foss. vol. ii. pt. 2, p. 224, 

 pi, xxvi. figs." 2, 3. Palisoniscum arenaceian, Barger, Verstein. Co- 

 burg. Gegend, 1832, p. 18, pi. i. fig. 1. Semionotus Spixi, Agass. torn, 

 cit. p. 8. Semionotus esox, Berger, Neues Jahrb. 1843, p. 86. Semio- 

 notus Bergeri, von Schaurotli, Zeitsclir. deutsch. geol. Ges. vol. iii. 

 (1851), p, 405, pi. xvii. ; Bovnemann, ibid. vol. vi. 0854), p. 612, 

 pi. XXV. ; Striiver, ibid. vol. xvi. (1864), p. 305, pi. xiii. figs. 1, 3, 4. 

 — Upper Keuper, Coburg. 



Semionotus Kapffi, Fraas, MS,— Keuper, Wiirttemberg. 



Semionotus Brodiei, Newton, Quart, Journ. Geol. Soc, vol. xliii. (1887) 

 p. 537, — Keuper, Warwickshire. 



Semionotus latus, Agass. to7n. cit. p. 227, pi. xxvii. Dapedius altivelis, 

 Agass, torn. cit.^. 8. — Lias, Seefeld, Tyrol, 



^Semionotus striatus, Agass. tom. cit. p. 231, pi. xxvii. a. figs. 6, 7. 

 — Lias, Seefeld, Tyrol. 



Semionotus Nilssorii, Agass. torn. cit. p. 229, pi. xxvii. a. figs. 1-5 ; 

 Nilsson, Trans. Acad. Sci. Stockholm, vol. xii. (1824), p. 103, pi. ii. 

 figs. 1-3. — Lias, Schonen, near Bosarp, Sweden. 



Semionotus leptocephahis, Agass. Neues Jahrb. 1832, p. 145 ; also torn, 

 cit. p. 222, pi. xxvi. fig. 1. — Lias, Boll, Wiirttemberg. 



* L. Agassiz, Rech. Poiss. Foss. vol. ii. pt. 1, p. 228, pi. 26 a. 

 t Eaerton, Figs, and Descr. Brit. Org. Remains (Mem. Geol. Surv.), 

 dec. xiii. pi. ii. 



