402 CRETACEOUS REPTILES. 
of this species of Pterodactyle from the chalk to that of which numerous remains 
have been found in the oolitic slate at Stonesfield*. 
So far as I have been favoured by the opportunity of making observations on 
true and indubitable remains of the Pterodactyle from the Kentish chalk, it 
appears to have been a smaller species than the Pterodactylus Bucklandi, and 
not to have exceeded, to say the most, the Pter. macronyz and Pter. Gemmingi. 
The idea of the gigantic proportions of the Pterodactyle of our chalk-deposits 
has, in fact, been founded on the assumption that the fossil bones of the Cimo- 
liornis figured in my ‘ British Fossil Mammals and Birds,’ pp. 545, 546, figs. 
230, 231, and in Tab. XXXIX. figs. 11 & 12 of the present work, belong to the 
genus Pterodactylus, and to the same species as the portion of cranium (Tab. 
XXXVIII. figs. 4 & 5) and the scapular arch (fig. 6). The disproportion of the 
long bone (Tab. XX XIX. fig. 11) to the scapular arch (Tab. XXXVIII. fig. 6) is 
such as to need only to be glanced at to form a judgement of the improbability 
of their belonging to the same species of Pterodactyle ; admitting, for the sake 
of the comparison, Mr. Bowerbank’s hypothesis that the long bone formed part 
of the skeleton of a gigantic Pterodactyle. But, if we further admit it to have 
belonged to the same species as the scapular arch, this idea of Mr. Bowerbank’s 
must of necessity involve the assumption that the scapular arch (Tab. XX XVIII. 
fig. 6) has belonged to a very young individual of the species, which assumption 
is negatived by the anchylosis that has taken place between the scapula (51) 
and the coracoid (52), where they contribute to form the glenoid cavity g for 
the humerus. I have yet obtained no evidence which shakes my original con- 
clusion that the bone (Tab. XX XIX. fig. 11) is part of the shaft of a humerus of 
a longi-pennate bird, like the Albatros. It is unnecessary to repeat here the 
reasons and comparisons that have led me to view in the distal extremity of the 
tibia of the Albatros the nearest approximation to the form of the well-defined 
trochlear articular extremity of the long bone figured in Tab. XXXIX. figs. 12 
& 13. 
Until the part of the skeleton of the Pterodactyle be shown to which that 
portion of bone can be demonstrated to be more closely conformed than it does 
to the part of the bird’s skeleton which I have pointed out (British Fossil Mam- 
mals and Birds, p. 545), its reference to the genus Pterodactylus will be held to 
be gratuitous, at least by all those practised and cautious microscopical observers 
* Lord Enniskillen possesses cervical vertebrae of the Pterodactylus Bucklandi upwards of an inch 
in length. 
