XvVl Obituary Notices of Fellows deceased. 
fossils until he became an accomplished paleontologist, with an intimate 
knowledge of the Vertebrate skeleton. In 1869 the Cambridge Press 
published his ‘Index to the Fossil Remains of Aves, Ornithosauria, and 
Reptilia from the Secondary System of Strata arranged in the Woodwardian 
Museum, and in the following year the same Press issued his well-known 
volume on ‘The Ornithosauria: An Elementary Study of the Bones of 
Pterodactyles, made from Fossil Remains found in the Cambridge Upper 
Greensand.’ The latter was in many respects a pioneer work, describing 
unpromising materials but with important results, and if it now appears to. 
have emphasised too strongly the relationships of Pterodactyles to Birds, it 
was at least stimulating and led to useful discussion. During subsequent 
years Prof. Seeley often recurred to the same subject, collecting facts as new 
‘discoveries accumulated, until in 1901 he published his small general work, 
entitled ‘ Dragons of the Air: An Account of Extinct Flying Reptiles,’ in 
which he summarised his latest views, with restored sketches of some of the 
animals described. Among other features, he was the first to recognise the 
curiously bird-like shape of the brain in Pterodactyles, and to point out that 
at least one of the Cretaceous genera was toothless. 
Prof. Seeley’s studies of Pterodactyles led him to recognise in 1870 some 
very large vertebrie, of light construction, from the Wealden formation, 
which he described as representing “ Ornithopsis, a gigantic animal of the 
Pterodactyle kind.” One of these bones had previously been determined by 
Mantell and Owen as the tympanic (or quadrate) of Iguanodon. Through 
the subsequent discoveries of the Rev. W. D. Fox in the Wealden of the Isle 
of Wight, it became clear that such vertebre belonged to a large Dinosaur ; 
and the group it represents is now well known through the finding of nearly 
complete skeletons of Diplodocus and Brontosaurus in the Upper Jurassic 
formations of North America. Prof. Seeley was always interested in the 
Dinosauria, and his determination of their fragmentary remains from the 
Cambridge Greensand and from the Gosau formation of Austria may be 
specially mentioned. In 1879 he read to the Scientific Club in Vienna a. 
paper on Dinosaurs in general, which was afterwards published in the 
‘Popular Science Review, and in 1887 he discussed before the British 
Association the classification of the Dinosauria, proposing that they should 
be divided into the two orders of Saurischia and Ornithischia. 
Prof. Seeley also made an exhaustive study of the marine reptiles, and was. 
particularly interested in comparing those of the Cretaceous and Upper 
Jurassic with the better-preserved specimens from the Lias. He distin- 
guished and described the Ichthyosaurian genus Ophthalmosaurus and the 
Plesiosaurian genera Mureenosaurus and Cryptocleidus from the Oxford Clay,. 
and an examination of the Leeds collection enabled him to discover the 
characters and variations of the shoulder-girdle in these reptiles. He 
described in detail the structure of a well-preserved Ichthyosaurian skull 
from the Upper Lias, and made some of the earliest observations on the 
supposed viviparous reproduction of Ichthyosauria. He also described a. 
