130 
SBLACHII. 
Aetobatis, sp. iiid. 
43317, 44050. Fragments of dental plates ; lied Crag, W oodbridgo, 
Suffolk. Purchased, 
The following detached dental plates are referable to the lower 
jaw of Aetobatis, but cannot be specifically determined. They arc 
all from the Middle Eocene of Bracklesham Bay, and most of them 
probably belong to A. irregularis : — 
25619, 25629. Gently curved plates, the former described by Dixon 
{op. cit. p. 201, pi. xi. fig. 7) under the name of 
arcuatus, Agass. Dkron Co 
P. 3058. Gently curved plate, of similar type to the preceding. 
Eniiishillen Coll 
P. 5430. Two similar specimens. 
Presented by P. E. Goombe, Esq., 188^ 
25617*. Small worn plate, described by Dixon {op. cit. p. 200, pi- 
fig, 6) as typo of new species, A. suheonve.rus. 
Diron Coll 
25627, 25628, 29033. Nine detached places, and two naturall) 
united, approaching type described by Dixon {op- 
p. 200, pi. xi. fig. 5) as A. convexus. Dixon Co 
P. 3057, P. 3060. Five similar detached plates. EnnislnUen Coll 
P. 1518. Five similar detached plates. Egerton CoV 
P. 5431. Four specimens. Presented by P. E. Coombe, Esq-, I88b 
The following species have been founded upon detached teeth, bu 
they are mostly undefined, the types being usually fragments of t o 
lower dentition : — 
Aetobatis arcuatus, L. Agassiz, Poiss. Foss. vol. iii. (1843), p- 327.-- 
Molasse ; Switzerland. Numerous other Tertiary teet 
have hcen referred to this species by Cope (Proc. ' 
Nat. Sci. Philad. 1807, p. 139), Leidy (Jouni. Acad. Nah 
Sci. Philad. [2j viii, p. 245, pi. xxxi. figs. 14-18), Gcrvais 
(Pal.Franq. pi. 80. figs. 1-3), Delfortrie (Actes Soc. Linn. 
Bordeaux, vol. xxviii. p. 228, pi. xi. fig. 41), and Probst 
(Wiirtt. Jahresh. vol. xxxiii. 1877, pi. i- fig- 28). 
Aetobatis brevisulcus, II. Lc Hon, Prtdim. Mem. Poiss. Tort. Belg. 
1871, p. 13 (name only). — Eocene; Belgium. 
Aetobatis giyanleus, K. E. Schafhiiutl, Siid-Bayerns Leth. Geogn. 
(1863), p. 237, pi. Ixiii. fig. 10. — U. Eocene; Bavaria. 
