294 Reports and Proceedings.— Correspondence. 
On tHe PreropactyrE, AS Eviprncn or A NEW SvuB-CLASS OF VERTEBRATA 
(Savrornia). By Harry Sunny, F.G.S., of the Woodwardian Museum, Cam- 
bridge. 
HE author described the basi-occipital, basi-temporal, basi- 
sphenoid, ex-occipital, supra-occipital, parietal, alisphenoid, | 
squamosal, petrosal, quadrate, quadrato-jugal, orbito-ethmo-sphenoid, 
vomer, os articulare, proximal end of the lower jaw, the pre- 
maxillary, maxillary, and dentary bones of the head: and all the 
characters concurred in suggesting that, but for the teeth, there is 
nothing to distinguish the Pterodactyle from a Bird. It approached 
most nearly to the common Cock. ‘The pectoral. arch was also de- 
scribed, and the furcula shown to be attached to the radial processes 
of the humeri. The author then went through the comparative 
osteology of the remainder of the skeleton, and showed that it 
supported the conclusion from the skull. 
The writings of Buckland, Owen, Huxley, Cuvier, Von Meyer, Gold- 
fuss, Wagner, Quenstedt, and others, were then reviewed, and shown 
to contain nothing which really supported the hypothesis that Ptero- 
dactyles were Reptiles. The Sawropsida were therefore divided 
into three sections,—Aves, Saurornia, and Reptilia ;—the Saurornia 
being Birds with teeth; with peculiar wings; tarsus and meta- 
tarsus separate; and reptilian types of vertebra, like the fossil Birds 
Pelagornis and Paleocolymbus of the Upper Greensand. 
Mr. Seeley then described as new species, Pterodactylus Huxley, 
Pt. macherorhynchus, Pt. Hopkinsi, Pt. Oweni, and Pt. (7) Carteri; 
completed the descriptions of Professor Owen’s species, P. Sedg- 
wicki, Pt. Fittoni, Pt. Woodwardi, and Pt. simus; and identified 
Pt. Cuvieri; thus adding six: so that now there are ten species from 
the Upper Greensand; one, Pt. Cuviert, being common to the Green- 
sand and Chalk. 
[As the Monograph of the Sauwrornia and Aves from the Green- 
sand is ready for publication, Mr. Seeley would be glad if gentlemen 
having specimens of Ptercdactyles or Birds would favour him by 
communicating the nature of their fossils. | 
CORRESPONDENCE. 
—_--_ 
‘PREGLACIAL’ AND GLACIAL DRIFT. 
To the Editors of the GEOLOGICAL MAGAZINE, 
GENTLEMEN,—Would your correspondent Mr. Kinahan be so kind 
as to state his reasons for supposing that the gravelly drift ewnder- 
lying the Boulder-clay, is ‘the drift of the country before the Glacial 
Period ?’ 
I believe that wherever there is a sufficiently thick remnant of 
Glacial Drift, it will be found to consist of three divisions :—Firstly, 
a bed of clean sand and shingle, containing Glacial Shells and some 
transported materials ; but not such a large number of Erratics as 
the true Boulder-clay ; secondly, true Boulder-clay with Glacial 
Shells, and generally, though not invariably, transported blocks ; 
