300 
SELACHII. 
of Bavaria, is named Acrodus jlexuosus , K. E. Schafhautl, Siid- 
Bayerns Leth. Geogn. (1863), p. 244, pi. lxiv. fig. 2. 
The following ribbed dorsal spines and hook-like cephalic spines 
pertain to various species of Hybodus and Acrodus , but cannot yet 
be even approximately determined. They may be conveniently 
arranged in stratigraphical order :— 
I. Mtjschelkalk. (a) Dorscd Fm-spines. 
48205. Basal portion of a large spine, assignable to the so-called 
Hybodus major , Agassiz 1 ; Luneville. Purchased , 1877. 
19685, 21509. Fra gments of two smaller spines ; Bayreuth, Bavaria. 
Purchased , 1845, 1847. 
P. 2160, P. 2175. Imperfect small spine, and fragment of one still 
smaller: the latter labelled u Hybodus dimicliatus, Agass.,” 2 
by Egerton, but not showing notches in the posterior 
denticles, and more resembling H. tenuis , Agassiz 3 ; Bay¬ 
reuth. Egerton Coll. 
P. 2780. Small broken spine ; Bayreuth. EnnislcUlen Coll. 
II. Keupek. 
P. 2178. Short dorsal fin-spine : Schlotlieim, near Gotha. 
Egerton Coll. 
III. Lias. —In addition to numerous fragments, the following in¬ 
determinable spines from the Lower Lias of Lyme Begis, 
Dorsetshire, may be enumerated :— 
(a) Dorsal Fin-spines. 
30869, 32748-9, 41381. Five small spines, approaching the spine 
named H. crassispinus. Purchased , 1856-57, 1869. 
P. 152. Slender spine, the exserted portion measuring 0T. 
Purchased , 1880. 
P. 425. Two smaller spines. Purchased , 1882. 
1 L. Agassiz, Poiss. Foss. vol. lii. p. 52, pi. viii. b. figs. 7-12; (?) H. von 
Meyer, Palseontogr. vol. i. (1849), p. 222, pi. xxx. figs. 3-5; F. Roemer, Geol. 
von Oberschlesien (1870), pi. xii. fig. 21. A _ . #4 • 
2 L. Agassiz, tom. cit. p. 53, pi. viii. b. figs/l3, 14. - 
3 L. Agassiz, tom. cit. p. 54, pi. viii. b. fig. 15. (?) H. von Meyer, Palaeontogr. 
vol. i. (1849), p. 223, pi. xxx. fig. 6 ; H. v. Meyer & T. Plieninger, Bcitr. Pal. 
Wiirttembergs, p. 56, pi. xii. fig. 69. (?) C. Giebel, Zeitscbr. gesammt. Naturw. 
vol. viii. (1856), p. 425, pi. i. fig. 5. 
