130 
SELACHII. 
Aetobatis, sp. ind. 
43317, 44050. Fragments of dental plates ; Fed Crag, AYoodbridge, 
Suffolk. Purchased, 1872,1873. 
The following detached dental plates are referable to the lower 
jaw of Aetobatis , but cannot be specifically determined. They are 
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 A. sub- 
arcuatus, Agass. Dixon Coll. 
P. 3058. Gently curved plate, of similar type to the preceding. 
Enniskillen Coll. 
P. 5430. Two similar specimens. 
Presented by P. E. Coornbe , Esq., 1888. 
25617*. Small worn plate, described by Dixon {op. cit. p. 200, pi. xi. 
fig. 6) as type of new species, A. subconvexus. 
Dixon Coll. 
25627, 25628, 29033. Nine detached plates, and two naturally 
united, approaching type described by Dixon {op. cit. 
p. 200, pi. xi. fig. 5) as A. convexus. Dixon Coll. 
P. 3057, P. 3060. Five similar detached plates. Enniskillen Coll. 
P. 1518. Five similar detached plates. Egerton Coll. 
P. 5431. Four specimens. Presented by P. E. Coornbe, Esq., 1888. 
/W™ j./u' . 
The following species have been founded upon detached teeth, but 
they are mostly undefined, the types being usually fragments of the 
lower dentition:— . 
Aetobatis ctrcucitus,Jj. Agassiz, Poiss. Foss. vol. iii. (1843), p. 32^'.— 
A 
/ cvSC 
Molasse; Switzerland. Numerous other Tertiary teeth 
have been referred to this species by Cope (Proc. Acad. 
Nat. Sci. Philad. 1867, p. 139), Leidy (Journ. Acad. Nat. 
Sci. Philad. [2] viii, p. 245, pi. xxxi. figs. 14-18), Gervais 
(Pal. Frang. pi. 80. figs. 1-3), Delf'ortrie (Actes Soc. Linn. 
Bordeaux, vol. xxviii. p. 228, pi. xi. fig. 41), and Probst 
fWiirtt. Jahresh. vol. xxxiii. 1877, pi. i. fig. 28). 
Aetobatis brevisulcus, H. Le Hon, Prelim. Mem. Poiss. Tert. Belg. 
1871, p. 13 (name only).—Eocene; Belgium. 
Aetobatis giganteus, K. E. Schafhautl, Siid-Bayerns Leth. Geogn. 
(1863), p. 237, pi. Ixiii. fig. MX—U. Eocene: Bavaria. 
A 
