1008 MR. D. M. S. WATSON ON 
ave no visible differences between them; it need not, therefore, be 
further considered. 
Apheloswurus is unfortunately very little known, but its 
shoulder-girdle seems very similar to that of Broomia in the large 
size of the coracoidal part. The slender limbs, however, differ in 
the fact that they are all of much the same length, and also in 
the much greater narrowness and compactness of the tarsus. 
The animal is, in fact, so incompletely known that little can be 
said about it. 
Proterosaurus is a very interesting form which is, however, still 
very little known. 
The skull, as known from the single, very imperfect example in 
the College of Surgeons Museum, is pointed and has teeth on 
the palate. There is apparently no evidence of the presence 
of an upper temporal vacuity, and nothing can be said of the 
condition of the temporal region. It differs from Broomia in its 
very long neck and in the enlarged cervicals. 
The vertebre differ in their light neural arches, but the rib 
articulation is essentially similar in the two types. The sacrum 
is fairly well preserved in the Newcastle Museum specimen from 
Fulwell, Durham; it is composed of two vertebre carrying large 
sacral ribs which resemble extremely those of Pacilospondylus as 
figured by Case, and to a less extent those of Broomia. 
The shoulder-girdle has a very large, presumably single, cora- 
coidal element, and a rather slender scapula, ‘The large inter- 
clavicle, with an expanded upper end, is not altogether unlike 
that of Broomia. 
The limbs are considerably more massive than those of Broomia 
and are still very imperfectly known, and, as in that type, the 
hind limbs are considerably larger than the fore. ; 
On our present knowledge of Proterosaurus it is impossible to 
be.certain of its systematic position, but it appears not improbable 
that it has something to do with Lroomia. 
The animal described by Howse and Hancock as Proterosaurus 
hucleyi iz quite distinct generically from Proterosaurus and may 
have no real connection with that animal. 
It is a small form with a long neck in which, however, the 
cervicals are not elongated. The centra are large and biconcave 
and the arches heavy. The ribs are single-headed. There are 
apparently intercentra present. The shoulder-girdle is fairly 
well shown. The scapula is a bone with no special features, and 
the single coracoidal element is very large and singularly lizard- 
like. The clavicle has an expanded lower end. The limb-bones 
are incompletely ossified. 
The humerus is remarkable for the very slight expansion of its 
extremities and the absence of a definite crest. 
There is a small entepicondylar foramen. 
The radius and ulna are small bones with no particular 
characters. 
The left carpus is perfectly preserved. 
