a new Species from the Lias of Whitby. 51 



ends. The breadth of the lower jaw across the condyles of the 

 quadrate bone is 3^ inches. 



The length of the cervical part of the vertebral column is 

 5 feet 10 inches. Its anterior portion is much obscured by the 

 investing matter and a layer of black varnish, which horribly 

 disfigures the whole specimen. Hence the number of cervical 

 vertebrae is not quite clear, though they are not fewer than 39. 

 Near the dorsals they are 2 inches long, wide, with the flattened 

 sides converging above, and only slightly compressed along the 

 whole length till near the articular surfaces, which have sharp 

 margins. 



The length of the dorsal and lumbar part of the vertebral 

 column is 4 feet 5 inches, and it contains twenty-four vertebras. 

 They have large, high, flattened neural spines, which almost touch 

 each other, and large rounded parapophyses separated by inter- 

 spaces never wider than their own diameter, and often only half 

 of it. 



The large rounded ribs in the middle of the back appear to 

 be about 13 or 14 inches long; they are moderately curved, 

 and embrace a width of 17 inches. 



There is one vertebra certainly sacral (there may be two). Its 

 whole side seems modified for an articulation. It is 2 inches 

 long. 



The tail is 4 feet long, and contains 28 vertebra;, remarkable 

 for very long parapophyses. 



Thus the total number of vertebra? is 



39 + 24+1 + 28 = 92, 

 and the total length is 



9 in. + 5 ft. 10 in. +4 ft. 5 in. + 2 in. + 4 ft. = 15 ft. 2 in. 



The pectoral bones are crushed and hidden. The pubes and 

 ischia are obscured in the dislocation of the pelvic region ; but 

 the iliac bones are well seen : they are 6^ inches long, expanded 

 and compressed spatulously behind; thick, rounded, and mas- 

 sive at the femoral end, which has a diameter of 2-g- inches. 



The limbs are very large, and the hinder ones slightly the 

 longer — their total length being, fore limb 3 feet 6^ inches, 

 hind limb 3 feet 10^ inches. 



The humerus is flattened, with the distal three-fourths of the 

 anterior border convex, and the proximal three-fourths of the 

 posterior border deeply cupped, the remaining distal part being 

 truncated. It measures, in length, 12 inches; in breadth, at 

 the radial end 9 inches, at the proximal end 4 inches ; while the 

 least breadth of the shaft is 2| inches. 



The radius and ulna are both flattened bones ; the ulna is 

 slightly reniform, while the radius is constricted below the 



4* 



