214 
ACTINOriEIlYSlI. 
diagnosis. The total number of vertebrae is shown to 
about 45, and of these the 21 caudals are well preserve 
Fragments of all the fins except tho anal are distinguis^ 
able. Purchased, lb< — 
32336. Imperfect head and abdominal region, with the greater pa r 
of the dorsal and paired fins ; Lower Chalk, Maidstone 
The fossil is broken across at the back of the head, on 
the opercular apparatus thus destroyed behind the P* - ^ 
operculum. The cranial roof is flattened, oonstric ^ 
behind, widest at the hinder border of the orbits, an^ 
marked by a sharp median depression between the or 
The very large frontal bones extend almost t° ^ 
occipital border, and are smooth in the middle p 01 
which passes into the iuterorbital depression, but ^ 
marked with the characteristic ornament in the ou,c1 .^ 
lateral portion. Anteriorly they unite in a suture 
the short and broad, smooth mesethraoid bone ; no ^ 
laterally they are overlapped by the nasal bones. ^ 
latter elements are well preserved, each being sh"W 
be antero-posteriorly elongated, almost ovate ^ 
pointed behind, and very conspicuously ornament* 
radiating series of tubercles. The otic region 
imperfect for description, and there are no 1 . ^ 
cheek-plates ; but in side-view there are reeo-m-^ ^ 
•remains of the jaws. The triangular metapterj g° 
completely displayed, but the remainder of the 
palatine arcade is obscured except at its u l’l Hr ^ rt j n 
The very long and slender premaxilla is imp 6 ’' ’ , af 
front, but exhibits the characteristic fin e 
ornament in its hinder two thirds, while the ora ’ 10 ugb 
still bears some of the minute teeth. The maxi a, ^ . 
fractured, is preserved for the greater part of >1 an( j 
underlapped moro than halfway by the premaxi a ^ araC , 
its hinder third exhibits some of the large an 0 j n fc 
teristic spaced teeth, which are inclined with 1 ^ 
forwards. Above the hinder third of the m ^‘*| cr j or iy 
the highly ornamented supramaxilla, antcro P° ,yj ie 
elongated, pointed in front and rounded belli” 
mandible is crushed at the symphysis an ® a „d 
fractured, but the suture between the 611 a ^ ent j s 
angular is distinct, and the fine tubercular or “ ^eing 
shown to cover the lower portion of both eleme , 
