Notices of Memoirs—On Bucklandium dilucti. 471 
VI.—On Bucktanviumu pDituvu, Konic, A Situroip Fish FROM THE 
Lonpon Cuay or Suerpry. By A. Surra Woopwarp, F.G.S8. 
N his well-known ‘Icones Fossilium Sectiles,’ pl. viii. No. 91, 
Konig figures a remarkable fossil from the London Clay of 
Sheppey, which is mentioned in the text as not certainly determinable, 
but generally regarded, by the anatomists who have examined it, as 
pertaining to some type of Lizard. This specimen is preserved in 
the British Museum, and the author has determined that it is truly 
the imperfect head and pectoral arch of a Siluroid. The roof of the 
skull is preserved almost as far forwards as the middle of the frontals ; 
the pectoral arch is in position, though slightly bent backwards ; 
and the mass of anchylosed anterior vertebrae, with the basioccipital, 
is displaced downwards and thrown beneath the clavicles. All the 
bones are remarkably strong, and the exposed surfaces are orna- 
mented with large tubercles. The head must have been originally 
somewhat deeper than broad, and the roof exhibits no flattening, 
but is strongly arched from side to side. Posteriorly, the supra- 
occipital projects in the usual manner, probably to meet a dermal 
plate upon the nape; and the post-temporal element seems to be 
merged with the bones of the postero-lateral angles of the cranium. 
It is impossible to determine the family-position of the genus in the 
usual manner, but the skulls of the West African Auchenoglanis and 
Synodontis appear to approach the fossil most closely. The provisional 
name of Bucklandium diluvii may be retained ; and the fish is inter- 
esting as being the earliest undoubted Siluroid hitherto discovered. 
VII.—A Comparison oF THE CreTAcEous FisH-FauNA OF Mount 
LEBANON WITH THAT OF THE EnouisH Cuate. By A. SMITH 
Woopwarp, F.G.S8., F.Z.S. 
O detailed comparison having hitherto been instituted between 
the Cretaceous fish-fauna of Mount Lebanon and that of the 
English Chalk, which belongs to a well-determined horizon, the 
author has undertaken a general survey of the genera, with the result 
that the two faunas are proved to have more forms in common than 
hitherto supposed. The Selachian fishes are scarcely comparable, 
Notidanus and Squatina being the only genera as yet recognized in 
the two formations; and, on the whole, those of Mount Lebanon 
exhibit the most modern facies, all traces of Hybodont Sharks and 
of Ptychodus being wanting. Chimeeroids are unknown at Mount 
Lebanon, but abundantly met with in the English Chalk. Among 
Ganoids there are representatives of the Pycnodonts both in the 
Lebanon (Palgobalistum, Coccodus, Xenopholis) and in England 
(Celodus), but no identical genera can yet be recognized. Rhombic- 
scaled Ganoids are rare in the English Chalk (Lophiostomus, Neo- 
rhombolepis), and unknown in Mount Lebanon; traces of Acipense- 
roids also occur in the former, but have not been discovered in the 
latter ; and at least one Crossopterygian genus occurs plentifully in 
England (Macropoma), while no uncertain remains have been 
