254 
ACTIXOPTERYGII. 
28415 a. Left splenial, the type specimen of the so-called Gyrodus 
mantelli , Agassiz, loc. cit. ; Tilgate Forest. Mantell Coll. 
28415 b. Two left splenials ; Tilgate Forest. Mantell Coll. 
39215. Imperfect small right splenial dentition; Wealden, Battle; 
Is V >, a. Sussex. Bowerbank Coll. 
P. 1629. Eight splenial dentition showing irregular subdivision of 
outermost series of teeth ; Tilgate Forest. Egerton Coll. 
P. 3763. Eight splenial with well-preserved teeth, showing the 
base of a single minute tooth within the principal series ; 
Wealden, near Hastings. Enniskillen Coll. 
P. 3755. Left splenial dentition, probably of this species; Purbeck 
Beds, Swanage. The principal teeth and a single minute 
inner tooth are exhibited only by their bases ; the outer¬ 
most teeth are more robust than is usual in the species. 
Enniskillen Coll. 
21349. Two more imperfect examples of similar dentition ; 
Swanage. Purchased , 1847. 
P. 7445. Similar right splenial; Purbeckian (Serpulit), Thiister- 
berg, Hanover. Purchased , 1895. 
Coelodus gyrodoides, Egerton. 
1877. Coelodus gyrodoides, Sir P. Egerton, Geol. Mag. [2] vol. iv. 
p. 52, pi. iv. tig. 3. 
Type. Yomerine dentition ; British Museum. 
A large species, known only by the vomerine dentition, which 
measures 004 in maximum width. Teeth of median series about 
twice as broad as long, with deeply concave posterior margin; teeth 
of the two lateral series nearly equal in size, slightly elongated 
transversely, and their width together exceeding that of the median 
series. All unworn teeth with apical indent, slightly crimped. 
Form. Sf Loc. Upper Cretaceous : Dorsetshire. 
P. 3762. Type specimen, shown of three-quarters the natural 
size in the accompanying fig. 31 ; Upper Greensand, 
Pinney Bay, near Lyme Eegis. Enniskillen Coll. 
Coelodus ellipticus, Egerton. 
1877. Coelodus ellipticus, Sir P. Egerton, Geol. Mag. [2] vol. iv. p. 49, 
pi. iii. fig. 1. 
Type. Eight splenial dentition ; British Museum. 
A large species known only by the splenial dentition. Teeth of 
