144 
ACTIN’ OPTER YGTI. 
P. 6396. Much fractured large specimen showing the characteristic 
operculum and teeth, and traces of the superior lateral 
line. Beetles Coll. 
P. 3566. Fish 0*32 in length, with comparatively broad operculum. 
Enniskillen Coll. 
37774. Imperfect fish about 0‘33 in length. Purchased, 1863. 
40089. Fish 0*3 in length, with abraded and fractured head-bones, 
but displaying the marginal teeth. Purchased, 1866. 
42435. Head and anterior flank-scales, the type specimen of Tetra- 
gonolepis leachi described and figured by Agassiz, loc. cit. 
The relatively large size of the tubercles upon the bones 
of the snout is well shown. 
Presented by Kenneth Murchison, Esq., 1872. 
44859. Remains of head and anterior flank-scales. 
Presented by Benjamin Bright, Esq., 1873. 
P. 350. Head and abdominal region of a small individual probably 
of this species. Tuberculations are almost absent upon 
the suboperculum and the lower portion of the operculum, 
perhaps in consequence of abrasion; and some of the 
large unicuspid teeth are conspicuous. Very large median 
scales occur in front of the anal fin, and the vertical series 
of flank-scales above the base-line of this fin are slightly 
reflexed forwards. Purchased, 1881. 
41214. Small fish 0-245 in length, with comparatively feeble 
ornament, and displaying large unicuspid teeth in the 
mandible. Purchased, 1868. 
P. 3570. More imperfect small specimen. Enniskillen Coll. 
P. 7428. Much abraded small specimen probably of this species. 
18514. Imperfect head and trunk of a fish about 0*35 in length, 
displaying the operculum and facial bones, the marginal 
teeth, and a large portion of the squamation; Upper Lias, 
Boll, Wiirtemberg. Purchased, 1844. 
P. 1592. Head vertically crushed and wanting the extremity of the 
snout; with some of the anterior dorsal and dorso-laoeral 
scales. Eger ton Coll. 
P. 3540. Small head with dentition. Enniskillen Coll. 
39144. More imperfect small head with dentition. Bowerbank Coll. 
