28 
ACTIXOPTERYGII. 
times in the total length from the pectoral arch to the extremity- of 
the caudal fin. Superficial granulations of external bones sparse, 
rounded, and those of the pectoral fin similar. Suboperculum 
about as deep as broad, with produced antero-superior angle; 
operculum much narrower and smaller, with somewhat excavated 
anterior border; at least nine or ten branchiostegal rays on each 
side. Pelvic fins more than two-thirds as large as the pectorals, 
the distance between these two pairs more than twice as great as 
that between the former and the anal. Anal fin about equal to 
the pelvic fins in size; dorsal relatively large, as long as deep ; 
caudal fin large. Caudal fulcra! scales narrow and sharplj’ pointed. 
Form. Sf Log. Lower Lias : Dorsetshire and Leicestershire. 
All the following specimens were obtained from the neighbour¬ 
hood of Lyme Regis, Dorsetshire :— 
P. 3361. Imperfect trunk, wanting the hinder half of the caudal 
region, but with remains of the head and opercular 
apparatus, described and figured by Egerton, loc. cit. 
p. 872, pi. lxvii. This being the first specimen described, 
must be regarded as the type of the species. 
Enniskillen Coil. 
P. 3366. Well-preserved fish about one metre in total length, shown 
of one-quarter the natural size in PI. I. fig. 1, and 
forming the basis of the restoration in fig. 2, p. 24. The 
head is obliquely crushed and very imperfect, but several 
elements are distinct. The exposed surface of the bones 
of the cranial roof is finely rugose, exhibiting a few 
tuberculations. Below it is the partially-covered robust 
hyomandibular (Jim.) ; and in the region of the jaws there 
only remain the imperfect pterygoid (pt.) and jugal (ju.) 
of the right side. The small narrow operculum (op.) and 
the relatively large suboperculum (s.op.) are well preserved. 
Both post-temporals are shown, that of the left side from 
the inner, that of the right side from the outer aspect; 
and the long, narrow supraclavicle ( s.cl .) is seen above 
the comparatively large clavicle (cl.). The axial skeleton 
of the trunk is only very imperfectly exhibited; but a 
few of the slender neural spines with their stouter arches 
occur scattered in the abdominal region. The specially 
robust haemal arches at the base of the lower caudal lobe 
are also seen. All the fins are preserved, only the upper 
extremity of the caudal being wanting. The anterior 
rays in each fin gradually increase in length to its apex, 
