AND CLASSIFICATION OF THE FOSSIL REPTILIA. 
259 
of a Plesiosaur, though I have as yet seen no Sauropterygian in which the obturator 
foramen passes through the pubis, or in which there is an extended sutural union 
between the pubis and isclhum. 
The Limbs of Eurycarpus Oweni (Seeley). (Plate 18.) 
The only evidence of the relative size of the limbs as compared with the vertebrae, 
in addition to the specimen of Keirognathus cordylusf is afforded by a sandstone slab 
47 centims. lonof, which is a natural mould including the neural arches of the anterior 
part of a vertebral column wdth a number of dorsal ribs. It appears to show the 
femur, and the whole of the fore-limb. Isolated parts of this slab, showing the fore- 
limb and those vertebrae which have ribs attached, have already been figured by 
Sir P. Owen in the ‘South African Catalogue,’ Plate 52, pp. 53, 54, regarded as 
Dicynodont. When the digits from this specimen were reproduced in 1880, the 
figure was described as (?) Dicynodon (‘Geol. Soc. Quart. Journ.,’vol. 36, Plate 17, fig. 5, 
p. 424). I am unable to detect evidence which would prove the animal to be 
Dicynodont, for the only data for comparison are the imperfectly displayed humerus 
and dorsal vertebrae ; and in neither are the characters such as have been found in 
Dicynodon or its known allies. The humerus appears to have much in common with 
that of Euchirosauriis, but is of a different generic type, and may conform to the 
Anomodont plan. The vertebrae are too imperfectly exposed to show the relation of 
the centrum to the neural arch ; and, although the neural spines are very short, and 
the transverse process short and stout, there is no vertebral character to show that 
the animal w^as not an Anomodont. An impression from the slab gives a deceptive 
appearance of lozenge-shaped dermal armour, which results from fracture of the 
stone. Although armour is characteristic of Labyrinthodonts, there can be no 
reason why it might not be present in an Anomodont. Some of the bones of the 
skeleton w^ere incrusted with a concretionary film, and this has adhered to the ulna 
and radius, and part of the femur, and to a large sub-triangular bone anterior to the 
humerus and parallel to the cervical vertebrae, so that the casts of those bones are not 
sharp. The latter sub-triangular bone appears to reseirrble the inter-clavicle of 
Pareiasaurus in form, though its positioir is that of a scapula ; and it is too imperfectly 
exposed to be determined with certainty. It is about 10 centims. long, and 4 centims. 
wide in the middle, with each of the three sides concave. Taken in association with 
the other characters, the bone may veil be an inter-clavicle, and the fossil would 
probably be a Pareiasaurian. Partly overlapping the humerus are fragmerrts of bones 
of the shoulder girdle, but too imperfect for determination. 
The neural arches of six dorsal vertebrae extend over 10 centims. The neural spines, 
which are very imperfectly preserved, appear to have been short in the dorsal region, 
and longer and more compressed from side to side in the neck. In a few vertebrae. 
* ‘ Phil. Trans.,’ B, 1888. 
2 L 2 
