SUPPLEMENT. 199 



is distinguished by a pair of tuslis ten and a lialf feet in length, and twenty- 

 six inches in circumferance at the base. In consequence of their sliglit curv- 

 ature, the}' project eiglit feet live inches in front of the head. The length of 

 the skull is four feet two inches ; width, twenty-nine inches. The apparent 

 disproportion of the tusks to the size of the skull is truly extraordinary, and 

 exemplifies the maximization of dental development. By their great lever- 

 age thej' must have added to the skull of the living animal a weight of nearly 

 two thousand pounds. The molars present seven or eight ridges, and the 

 valleys between are filled with a large quantity of cement. The original, 

 preserved in the British Museum, was discovered in that classical palseonto- 

 logical ground — the Sewalik Hills of India — in a Pliocene deposit, consisting 

 of concretionary grit, conglomerate, sandstone and loam, and containing lig- 

 nite, trunks of dicotyledonous trees, and land and fresh-water shells. 



This cast is in five pieces. Price, with mounting and pedestal, $95. 



No. [279.] Colossochelys Atlas, Falc. and Caut. 



-This gigantic Tortoise — the King of the Chelonians — was a contemporary 



of the Sivathermm. This cast is a restoration from fragments discovered in 



the Pliocene strata of the Sewalik Hills, India, and now in the Museum of the 



Asiatic Society of Bengal. Size, 13 ft. x 5 ft. 10 in. 



Price of all the parts, with pedestal, $350. 



No. [228.] Plesiosaurus Cramptoni, Carte and Baily. 



Skeleton, on slab. This splendid Plesiosaurus — the largest ever dis- 

 covered — was found in 1848 in the Lias, near Whitby, England, and adorns 

 the Natural History Museum of the Royal Dublin Society. It lies in a 

 prone position, resting upon the ventral surface with the head and neck 

 slightly inclined to the right. The skull is almost entirely free from the 

 matrix, and is very perfect, excepting the zygomas. In contour it is croco- 

 dilo-lacertian; it is somewhat flattened in proportion to its length and width, 

 tapering from the parietal crest to the snout. The orbits are obliquely placed 

 and subtriangular in shape; the greatest diameter is five and a half inches. 

 The nasal apertures are ovoid, and are situated just in front of the orbits. 

 The anterior portion of the cranium is elongated and rounded at the muzzle. 

 The lower jaw is extremely massive, its greatest length being three feet six 

 inches, and its greatest depth, six inches. The teeth number over a hundred. 

 They resemble those of the Crocodile in their irregular arrangement, and in 

 being implanted in distinct cavities. The large teeth are situated in front. 

 The length of the head is to that of the neck as five to eight, and to that of 

 the whole skeleton as one to six. The vertebral column throughout has 

 fallen over towards the right side, presenting a slightly irregular curve, thus 

 exposing in the cervical series a side of the centrums with their large neu- 

 rapophyses. The cervical vertebrae number twentj'-seven. There are thirty 

 dorsals, having a united length of eight feet. The caudal portion is some- 

 what dislocated ; the centrums with their spines and processes are, however, 

 well exhibited. The vertebrae of this region number thirty-four. The ribs 

 are well shown, being nearly in their original position. Excepting the left 

 hind-paddle which is imperfect, the extremities are remarkably preserved. 

 The carpal and tarsal bones are each six in number; the metacarpals and 

 metatarsals, four. The humerus and femur are each twenty inches long. 



This cast is in eight pieces. Size, 22 ft. 8 in. x 12 ft. 6 in. 



Price, painted and packed, $150. 



