594 
ACTIN0PTERY8II. 
feebly crimped or smooth, the upper enlarged flank-series smaller 
than the lower enlarged flank-series. 
Form. Sf Loc. Upper Eocene : Monte Bolca, near Verona. 
P. 4141. Fine specimen about 0 - 77 in length, deepened by distor- 
tion at the back of the head, which is figured by Agassiz, 
tom. cit. pi. xliv. fig. 1. The hinder part of the cranium 
is crushed upwards, while the mandible is displaced 
downwards, so that both its slender rami are seen from 
beneath. The mandible does not appear to have extende 
much further forwards than the base of the rostrum. 
Small scutes are seen to extend over the opercular appa- 
ratus ; and the ossified sclerotic is partly preserved, lhe 
pectoral fins are displaced but both shown as indicated in 
Agassiz’s figure ; the lowermost exhibiting three of its basa 
bones in position. Comparatively small and delicate rays 
in front of the pectorals may represent pelvic fins, but it 
is uncertain whether these are not merely branchiostcg 
rays. The dorsal fin-spines have the appearance o 
extending forwards over the head merely in consequence 
of the displacement of parts just described. Tho depth o 
the abdominal region in the fossil must also be less than 
was actually the case during life. Enniskillen Co 
P. 4142. More imperfect and distorted larger specimen, showing t o 
mandiblo as before, and the parts of the cranium muc 
scattered. Immediately in front of the frontals, the 
fractured base of the rostrum seems to consist of a pan 0 
tubes pressed together like those of the so-called Ccelo 
rhynchus. A longitudinal series of rather large perforations 
penetrating tho dense armour of the hinder part of the tai , 
appears to mark the course of the lateral line. 
Enniskillen Coll- 
19940. Fine small fish, distorted like the preceding specimens at 
the back of tho head and in the abdominal region. T' lC 
slender mandible is seen to extend not much further 
forwards than the base of the rostrum ; and the delicate 
suspensorium is displaced between it and the cranium. 
Small scutes extend over the triangular operculum an 
perhaps over part of the cheek. The haemal arches ot nios 
of the vertebrae are observable, and used in the accom 
panying restoration (fig. 22). The median fins and derma 
scutes are also well preserved ; the enlarged flank-scu e- 
