472 
ACTIXOPTERYGH. 
one-quarter of tlie same total length. All the head and opercular 
hones smooth or very feebly rugose in part; angle of preoperculum 
with indications of radiating ridges ; maxilla not much arched ; 
teeth comparatively robust, obtusely pointed. Fin-rays smooth and 
stout; fulcra conspicuous. Pelvic fins arising far in advance of the 
middle point of the trunk, and the dorsal fin opposed to them. 
Scales large, ornamented with coarse oblique ridges, slightly radiating, 
and terminating at the hinder margin in very prominent aenticula- 
tions ; several series of flank-scales deeper than broad ; the orifices 
of the lateral line prominent, forming a ridge on the caudal 
pedicle ; the ornament on the caudal region becoming feeble. 
Form. Sf Lee. Purbeckian : Dorsetshire. 
P. 7583. Imperfect caudal region, the type specimen described and 
figured by Agassiz, loc. cit. ; Swan age. Agassiz’ determi¬ 
nation of the dorsal is shown by Egerton (Joe. cit.) to be 
due to a misinterpretation of some broken scales and 
inaccurate drawing. The enlarged scale at the base of 
the upper caudal lobe is pointed at each extremity and 
very feebly rugose. Mantell Coll. 
43038. Greater portion offish, much crushed and distorted; Swanage. 
Purchased , 1871. 
P. 6378. Another fine specimen, somewhat distorted, the chief basis 
for the proportions of the fish given in the above diagnosis ; 
Swanage. Beckles Coll. 
28445-46. Two more imperfect specimens, displaying parts of the 
head-bones and squamation ; Swanage. Cunnington Coll. 
P. 4411. Eemains of head with well-preserved abdominal flank- 
scales, and part of the axial skeleton of the caudal region; 
Swanage. The neural and haemal arches in the caudal 
region are short, robust, and much inclined backwards, 
and the vertebrae are delicate broad rings, possibly divided 
into hypocentral and pleuroeentral pieces. 
Enniskillen Coll. 
P. 3605 a. Head and abdominal region, ventral and partly lateral 
aspect; Swanage. The nearly smooth maxillae and den- 
taries, with their regular series of obtusely pointed teeth, 
are well shown ; and fulcra are conspicuous both on the 
pectoral and pelvic fins. Enniskillen Coll. 
P. 1075. Crushed portion of caudal region ; Up way, near Weymouth. 
Egerton Coll. 
