52 
Hoplites hetoroptychus , Pavl. 
Neocomian. Speeton. 
Pavlow and Lamplugh, “ Argiles de Speeton,” p. 109, 
pi. xi., fig. 22. T 
H. pseudomutabilis , Loricl. 
Kimeridge Clay. Speeton. 
Pavlow and Lamplugli, “Argiles de Speeton,” p. 98, pi. i., 
fig. 7. 
Olcostephanus ( Polyptychites ) gravesiformis, Pavl. 
Portlandian. Speeton. 
Pavlow and Lamplugh, “ Argiles de Speeton,” p. 124, 
pi. vi., figs. 7 a, b, c. T 
0. ( Polyptychites) gravesiformis, Pavl. 
Op. cit. pi. vi., fig. 8. 
0. ( Polyptychites ) Keyserlingi, Neum and Uhl. 
Portlandian. Speeton. 
Pavlow and Lamplugh, “ Argiles de Speeton,” p. 120, pi. 
ix., figs. 1 a, b, c. 
Note.--0. ( Simhirslcites ) Payeri , Toula, stated in Pavlow 
and Lamplugh’s 11 Argiles de Speeton ” to be in this Museum 
is in Mr. Lamplugh’s own collection. 
0 . (Polyptychites) polyptychus, Keys. 
Portlandian. Speeton. 
Pavlow and Lamplugh, “ Argiles de Speeton,” p. 119, pi. 
viii., figs. 2a, b, c. 
0. (Polyptychites) triplodiptychus, Pavl. 
Portlandian. Speeton. 
Pavlow and Lamplugh, " Argiles de Speeton,” p. 122, pi. 
viii., figs, 4 a, b, c. T 
Gyrosteus mirabilis , Ag. 
Lias ( Communis Zone). Whitby. 
J. F. Blake, “ Yorkshire Lias” (Tate and Blake), p. 256, pi. 
ii., fig. 2. (Spine). 
G. mirabilis , Ag. 
Op. cit., pi. ii., fig. 3. (Fin-rays). 
