VERTEBRATE PALAEONTOLOGY IN 1914 631 



of the ceratopsian flange, which, in its fullest development, 

 recalls that of a fireman's helmet. In the smaller and less 

 specialised type represented by Monoclonius the supra-occipitals 

 form a pair of hook-like opposing processes on the hind border 

 of the upper surface of the skull, leaving a mushroom-shaped 

 interval between them, and a pair of very large vacuities in 

 the skull-roof. In Anchiceratops the supra-occipital processes 

 have united in the middle line, where only a remnant of a 

 central fontanelle is left, while the vacuities in the lateral 

 portion of the cranial roof are much smaller. Finally, in 

 Triceratops, the largest and latest member of the group, all 

 vacuities have-disappeared from the cranial roof and the nuchal 

 flange attains its maximum development. 



In a third paper {op. cit. pp. 549-58) Mr. Brown describes 

 a nearly complete skull of Monoclonius from the Belly River 

 beds, which exhibits very clearly the features just referred to ; 

 while in a fourth {op. cit. pp. 567-80) he proposes the name 

 Leptoceratops for a small member of the horned group, in which 

 the nasal horn has disappeared. 



According to a statement issued by the Smithsonian In- 

 stitution, the nearly complete skeleton of a dwarf horned 

 dinosaur (Ceratopsia) has been discovered recently in the Mon- 

 tana Cretaceous. The skull measures only 22 in. in length, 

 against from 6 to 8, or even 9 ft., in the larger members of 

 the group, the whole size of the new form being only about 

 one-fourth that of the latter. 



In this place may be mentioned Youngina capensis, 2, new 

 type of thecodont reptile from the Permian of the Cape, de- 

 scribed by Dr. R. Broom in the Proc. Zool. Soc. (pp. 1072-7) 

 for the year under review. Although its affinities are very 

 doubtful, some of its characteristics are such as might be 

 looked for in the ancestors of the sauropod, and possibly certain 

 other dinosaurs. 



Brief reference will suffice for an illustrated notice in the 

 December number of the Museums Journal of the skeleton of an 

 ichthyosaur {Ophthalmosaurus icenicus) from the Oxford Clay of 

 Peterborough, recently placed on exhibition in the geological 

 department of the Natural History Branch of the British Museum. 

 As mounted, this specimen (fig. 6), the first entire articulated 

 skeleton of an ichthyosaur ever placed on exhibition, measures 

 iust over 13 feet in length. The number of pairs of ribs is about 



