FAUNA OP THE OOSAU FORMATION. 



681 



The second vertebra is about 1| centim. long, but had a keel on 

 the base of the centrum. It appears to have been smaller than the 

 other ; but, as the dorsal half of the centrum is not preserved, it may 

 be that this is a similar caudal vertebra. 



There is no evidence that these vertebrae belong to the animal 

 which possessed the limb-bones ; and I have noticed them here be- 

 cause they are not obviously referable to any of the other species 

 described. 



Hoplosatjetjs ischyrus, Seeley. 



In June 1880 I received word from Prof. Suess that another 

 collection of Cretaceous reptile remains from the Gosau beds existed, 

 which was discovered long before the publication of Br. Biinzei's 

 paper. Eventually this small series was secured by Prof. Suess, 

 and forwarded to me. The specimens are imbedded in a hard 

 calcareous clay, and are in a bad state of preservation, having 

 been fractured in the contortion of the rocks to an extent that 

 often makes identification of the fragments . extremely difficult. 

 Prof. Suess remarks of the collection, " It is not very much — a few 

 broken articular ends of limbs, a number of those thick roof-shaped 

 dermal plates well known to you, and a few fragments of vertebras — 

 the whole imbedded in a number of hard fragments of calcareous 

 clay evidently once united together, and clearly belonging to the 

 same individual ; so they may be of some interest as showing to 

 which limb-bones the dermal plates belong." They are certainly 

 the most unpromising set of fragments that I ever examined with a 

 view to the study of a new type of life ; and yet they certainly in- 

 dicate a different species from any of which the other collections give 

 evidence. I have removed the matrix, and offer a few notes on some 

 of the more characteristic fragments. 



Proximal end of r ight Humerus. 



This fragment indicates a humerus very different from any thing 

 with which I am acquainted, but perhaps makes a near approxima- 

 tion to that reptilian humerus described by Mr. Hulke as probably 

 referable to Hylceosaurus. It has lost the radial crest, which appears 

 to have been reflected downward more conspicuously than in Mr. 

 Hulke's specimen, and to have presented more of the Crocodilian 

 conformation, though it extended up to the articular head of the bone, 

 as is usual in Dinosaurs. The superior surface has been fractured, 

 so that the entire thickness of the humeral articulation is not de- 

 monstrated ; but it was evidently oblong, and measures 6 j centim. in 

 width, and, as preserved, is 4 centim. thick just internal to the 

 radial crest, and over 3 centim. thick above the ulnar tuberosity. 

 It appears to have been comparatively flat, and is remarkably pitted 

 with the evidences of a cartilaginous epiphysis. It appears to be 

 inclined at a considerable angle towards the radial side of the bone. 

 Towards the ulnar side it is rounded. On the ulnar margin it is con- 

 stricted ; and a portion of a tuberosity remains on the inferior sur- 

 face which is 2 or 3 centim. below the articular head, and increases 



