myliobatid-j:. 
129 
P. 1519. Portion of upper dentition ; Braeklesham. Egerton Coll. 
40524. Rolled fragment of upper dentition ; Braeklesham. 
Purchased, 1867. 
25616. Type specimen of A. rectus, Dixon ; Braeklesham. 
DLvmi Coll 
P. 5429. Similar specimen ; Braeklesham. 
Presented by P. E. Coomhe, Esq., 1888. 
40263. Small upper dental plate ; Braeklesham. Edwards Coll. 
P. 3506. Two detached upper dental plates, and two in natural 
association; Braeklesham. EnnisMllen Coll. 
P. 1519 a. Fragments of upper dental plates, one perfect, and two in 
natural association; Braeklesham. Egerton Coll. 
P.5588. Connected series of si.x imperfect upper teeth; Brackles- 
ham. Harford Coll. 
P. 1517. Upper dental plate and fragment ; Barton Cliff. 
Egerton Cold. 
P. 3055. Portion of lower dentition, showing parts of ten plates ; 
Isle of Sheppej . Ehiniskdlen Coll. 
25618, 25626. Single dental plate, and series of four, referable to the 
lower jaw, figured by Dixon as pertaining to the present 
species, oq>. ctt. pi. xi. figs. 3, 4 ; Braeklesham. 
Idi.ron Coll. 
25622. Series of three lower dental plates ; Braeklesham. 
Dixon Cold. 
Aetobatis marginalis, Dixon. 
1850. Aetobatis marginalis, F. Dixon, Foss. Suss. p. 201, pi. xii. fig. 1. 
Type. Portion of upper dentition ; British Museum. 
The coronal surface is much raised in the middle, thus exhibiting 
a strongly arched contour, and the tooth attains a considerable thick- 
ness. The crown becomes suddenly flattened a short distance from 
each extremity, producing a small marginal area marked with large 
longitudinal wrinkles. 
Form. Loc. Braeklesham Beds (Jliddle Eocene) : Braeklesham 
Bay, Sussex. 
25624. Type simcimen figured by Dixon, lot. eit. Dixon Coll. 
25625. Fragment of two connected upper dental plates, referred to 
by Dixon, loc. cit. (joll. 
P. 5428. Fragments of three teeth. 
Presented by P. E. Coombe, Esq., 1888. 
K 
