58 ME. E. LTDEKCEE ON A NEW 



Dinosaur from the Kimeridge of Peterborough, of which one side 

 of the pelvis * is figured by Mr. Hulke on p. 697 of the preceding 

 volume of the Journal under the name of Ornithopsis Leedsi. The 

 latter is evidently a member of the Atlantosauridae, and I agree 

 with Mr. Hulke in regarding the characters of the pelvis as not 

 generically different from those of the "Wealden form. Under these 

 circumstances we may, I think, pretty safely refer the so-called 

 Cetiosaurus Jiumerocristatus to Ornithopsis, and I would venture to 

 suggest that there are no grounds for separating 0. Leedsi from that 

 species. The type of Mr. Hulke's Ischyrosaurus may also be pro- 

 visionally placed in the same genus, and, if adult, will indicate a 

 second and smaller species, which we may call 0. Manseli, from a 

 MS. name of Mr. Hulke's. 



"With regard to Cetiosaurus, in which I take C. oxonie)isis, Phillips, 

 of the Great Oolite as the type, the caudal vertebrae agree with those 

 of the J^orth- American Morosaurus in their open chevrons, articu- 

 lating by double facets ; while the humerus is of the same broad and 

 massive type, and the scapula has also its distal extremity similarly 

 expanded. I find, moreover, that by reversing the relative position 

 of the pubis and ischium in Phillips's diagram (in which the incor- 

 rect position has been pointed out by Mr. Hulke) these bones closely 

 accord in contour with those of the American genus, the ischium being 

 directed backwards, with the middle of the acetabular portion placed 

 far above the axis of the shaft, and the latter slender and devoid of 

 distal expansion f. There appears, therefore, to be but little doubt as 

 to the close alliance between Cetiosaurus and Morosaurus, and fur- 

 ther evidence is required as to the right of the latter to distinction. 

 1 have already mentioned Cetiosaurus brevis under the head of Pelo- 

 rosaurus, but I may here bring to notice an associated humerus, 

 radius, and ulna, from the Wealden of the Isle of Wight, in the 

 collection of Mr. S. H. Beckles, of which the British Museum 

 possesses casts (No. 28701). The length of the humerus is 0*620 

 (24-5 inches) ; its shaft is much shorter than that of the correspond- 

 ing bone of C. oxoniensis ; but it approximates to that tj^pe in its 

 widely expanded head, and there appears a probability that these 

 bones may belong to C. hrevis, in which case that form would differ 

 widely from the type species, and would likewise be certainly 

 distinct from Pelorosaurus. On the other hand, these limb-bones 

 may perhaps be referable to Titanosaurus, or possibly even to a 

 new genus. Titanosaurus itself is, I find, represented, not only in 

 the Wealden, but also by a postmedian caudal vertebra (No. 32390) 

 of a larger form from the Upper Greensand of the Isle of "Wight ; 

 and this leads me to think that the imperfect limb and pelvic bones 

 from the Lower Greensand of Hythe, figured by Sir Eichard Owen 

 in his 'Cretaceous Reptilia' (Mon. Pal. Soc. pt. 1, pis. xii., xiii.) 

 under the name of Polyptychodon, but subsequently regarded by the 



* I am indebted to 'Mi\ Hiilke for the inspection of a larger photograph of 

 this specimen. 



t In Brontosatirus and Oroiithopsis the middle of the acetabular portion is 

 placed on the axis of the shaft, and the distal end is much expanded. 



