132 DINOCERATA. 



The main dimensions of the first rib in one individnal of Dinoceras 

 niirabile are as follows : 



3Ieasurements of First Rib. [Dinoceras niirabile. No. 1251.) 



m. 



Total length of rib, .320 



Greatest diameter of head, .. . .038 



Transverse diameter of head, .032 



Diameters of tubercular articulation, _ .020-.030 



Diameters of shaft, near the middle, .021-. 040 



Diameters of .shaft, at sternal end, .027-.095 



The principal ineasm-ements of the second rib of Uintatlierium are 

 given below. 



3Ieasi(rements of Second Rib. (Uintatherinm lati/rons. No 1231.) 



m. 



Total length of rib, in straight line, _ _ . - - .410 



Greatest diameter of head, -- .055 



Transverse diameter of head, - .030 



Diameter of tubercular articular face, -._ --- .024 



Diameters of shaft, near the middle, _ — .020-.039 



Diameters of shaft, at lower end (approximate), .. --. .025-. 060 



The dimensions of two dorsal ribs of Dinoceras are as follows : 

 Measurements of Anterior Rib. [Dinoceras mirabile. No. 1212.) 



ID. 



Total length of rib, in straight line, 500 



Greatest diameter of head, — . -048 



Transver.se diameter of head, - -036 



Diameter of tubercular articular face (approximate), .. — .. — .023 



Diameters of shaft, near the middle, .022-060 



Diameters of shaft, at lower end (approximate), . _ 025-.038 



Measurements of Median Rib. [Dinoceras mirabile, No. 1210.) 



Total length of rib, in a straight line, .. — -60.5 



Diameters of head, .O47-.o58-.005 



Diameters of neck, - - 034-.039 



Diameters of shaft, 017-.057 



