332 GEOLOGICAL SUEVEY OF THE TEREITOEIES. 



and 2 premaxillaries on each. side. Size about that of H. coryphceus, 

 or near 30 feet in length. 



LiODON GLANDIFEEITS, Cope, {loG. cU.) — A larger species than the last, 

 with apparently a greater flexibility of body, as indicated by the forms of 

 the vertebral centra. It is represented by portions of two individuals 

 from localities twenty-five miles apart. There are unfortunately in each 

 case only a cervical vertebra, but they agree in possessing such peculiari- 

 ties as distinguish them widely from anything yet known to the writer. 



LiODON LATISPINUS, Copc, (Proc. Am. Philos. Soc, 1871, p. 169; 

 loG. cit, 1871, December.) — The remains representing this species con- 

 sist of seven cervical and dorsal vertebrae, five of them being continuous 

 and inclosed in a clay concretion. It is a large species, nearly equal- 

 ing the L. mitcMllii in its dimensions ; that is, 40 or 50 feet in length, 

 and is intermediate between such gigantic forms as L. dyspelor and the 

 lesser L. curtirostris. The type specimens were found by Professor B. 

 F. Mudge, one mile southwest of Sheridan, near the "Gypsum Buttes." 



LiODON CRASSARTUS, Copc, sp. nov. ; Liodo7i, large species near L. 

 proriger, Cope, (Proc. Amer. Philos. Soc, 1871, p. 168.)— This saurian, 

 which is similar in size to the last, is represented by a series of dorsal, 

 lumbar, and caudal vertebrae, with some bones of the limbs. 



The vertebrsB are as much distinguished for their shortness as those 

 of L. latispinus are for their elongation. The articular faces are but 

 little broader than deep, and their axes are slightly oblique. This 

 species is interesting as having furnished the materials for the first de- 

 scription of the posterior extremities in this order of reptiles. The 

 humerus is a remarkable bone, having the outline of that of Clidastes 

 propython, Cope, but is very much stouter, the anteroposterior dimen- 

 sions of the proximal extremity being greatly enlarged. The long diam- 

 eters of the two extremities are, in fact, nearly at right angles instead of 

 in the same plane, and the outline of the proximal is subtriangular, one 

 of the angles being prolonged into a strong deltoid crest on the outer face 

 of the bone, which extends half its length. The Inner or posterior distal 

 angle is much produced, while the distal extremity is a flat, slightly 

 curved, diamond-shaped surface. The fibula is as broad as long and 

 three-quarters of a disk. The phalanges are stout, thick, and depressed, 

 thus diflering much from those of Liodon ictericus. A bone which I can- 

 not assign to any other position than that of femur, has a peculiar 

 form. It is a stout bone, but more slender than the humerus. The 

 shaft is contracted and subtrilateral in section. The extremities are 

 flattened, expanded in directions transverse to eacb other ; the proximal 

 having, however, a lesser expansion in the plane of the distal end. The 

 former has, therefore, the form of an equilateral spherical triangle, the 

 apex inclosing a lateral fossa and representing probably the great tro- 

 chanter. The distal extremity is a transverse and convex oval. This 

 bone is either ulna, femur, or tibia, judging by form alone. Its greater 

 length, as compared with the fibula, forbids its reference to the last ; the 

 trochanter-like process ot" the head is exceedingly unlike any examples 

 of the second bone I have seen. Its reference to femur is confirmed by 

 its presence with the caudal vertebrae of a similar species from near the 

 Missouri Eiver, ]S"ebraska, and its resemblance to the femur of L. dyspelor. 



The remains above described were obtained by Professor B. F. Mudge, 

 near Eagle Tail, in Colorado, a few miles west of the line separating 

 that Territory from the State of Kansas. 



A series of twenty-nine caudal vertebrae, with and without diapophy- 

 ses, from a blufi' on' Butte Creek, belongs perhaps to this species. The 

 proximal specimens, at least, cannot be distinguished from those of Pro- 



