156 
SELACHII. 
Type. Nearly complete disk; British Museum. 
Fill-rays robust, closely arranged, and more than 50 (usually 
about 55) in number in the pectorals. Trunk scarcely more than 
twice as long as broad. Attains to much largo dimensions than 
G. oliffodactyliis. 
Poem. ^ Loo. IT. Cretaceous (Senonian) : Ilakel, Mt. Lebanon, 
Syria. 
P. 4011. Type specimen and counterpart. Purchased, 1886. 
P. 4010. Imperfect disk, smaller than type. Purchased, 1883. 
P. 100. Complete disk, slightly obscured by matrix. 
Purchased, 1880. 
49514. Greater portion of disk and counterpart, showing dermal 
tubercles ; referred to by the present writer, loc. cit. 
Purchased, 1878. 
49556. Incomplete disk of small individual, probably young of this 
species. The small dermal tubercles are referred to by 
the present writer, loc. cit. Purchased, 1878. 
Cyclobatis, sp. ind. 
A single specimen (no. 49557, purchased 1878) not improbably 
indicates a distinct species from both tho.se already described. The 
length of the trunk is less than twice its breadth. The number of 
pectoral fin-rays agrees with that characterizing G. oliyodactylus, 
but the fins are relatively broader, and the tail is apparently 
longer, and armed with series of large spinous tubercles. The 
specimen is referred to by the present writer, Geol. Mag. [3] vol. iv. 
1887, p. 509. 
TECTOSPONDYLI INCERTiE SEDIS. 
The two following genera and species are founded upon fragments 
of pectoral fins, in the Bristol Museum, apparently pertaining to 
some type of Hay. 
Arthropterus rileyi, L. Agassiz, Poiss. Foss. vol. iii. (1843), 
p. 379. — Lias ; Bristol. 
Gyclarthrus macropterus,L. Agassiz, tom. cit. p. 382, pi. xliv. fig. 1- 
— Lower Lias ; Lyme Regis, Dorsetshire. 
The teeth described as follows may also pertain to Rays : — 
Gryphodohatis uncus, J. Leidy, Journ. Acad. Nat. Sci. Philad. [2] 
vol. viii. (1877), p. 249, pi. xxxiv. figs. 8, 9.— Phosphate 
Beds ; South Carolina. 
