50 [March 3, 
Measurements. M. 
Length centrum anterior lumbar........... 65 eee eee eee 055 
DIAMELeL CU OO, saa + nieces curtail tee iets es 042 
ie neurapophysis do..........-..- APSR OO a livey ae 043 
ny if CLOUSA) eo ccs eee alas rk ee 027 
My CUp.Of COMO eee ene OG ret Ss eit 085 
Length base hypapophysis........-.--.+-- may cd ee sca 08 
Length centrum median cervical. ...........--.-eee eens O51 
Width cup oo ee ee ee a 08 
Depth ‘“ ef cman Leone Lea aon a 0385 
e “ anterior Ae aal Snare SL nip 029 
Width <‘‘ S i Mann are eee Eee 0382 
is between post. marg. parapophyses................ 045 
Depth of centrum to lower edge.....-- Seite ce wee Cra 1 ae 04 
Bottosaurus macrorhynchus, Harl., was then a crocodilian with a body 
of the proportions of our alligator, but with larger legs, and relatively con- 
siderably larger head. The cranial bones, however, are much less massive, 
as though to reduce the weight which would prove inconvenient to a body 
of no larger size. The bones of the mandible are thin and enclose large 
pneumatic cavities ; the teeth are hollow and with thin walls. 
Lam indebted to Judson C. Gaskill for the opportunity of examining 
this interesting fossil. 
DINOSAURIA. 
HADROSAURUS CAVATUS, Cope, sp. nov. 
This species is indicated by remains derived from the upper green sand 
bed of the upper Cretaceous of New Jersey. They belong to an individ- 
ual of the gigantic proportions characteristic of the four known species 
of the genus. It is smaller than ZZ. tripos or H. occidentalis, and in a less 
degree smaller than the I. foulkei, 'The remains consist of four caudal 
vertebrae from the median part of the series, three of them exhibiting 
rudiments of the diapophyses. In two of them the neural arch remains, 
one with the spine, and the articular prominences for the chevron bones 
are nearly complete. 
The first character which is observed in these vertebree is their opistho 
coelian articulation. The posterior concave face is marked by a more or. 
less prominent elevated band descending from the end of the floor of the 
neural canal, and which is sometimes grooved medially. The convex ex- 
tremity is swollen in the middle, most especially so at three points, and a 
groove or depressed band which has less than one fourth the width of the 
centrum, extends round the margin outside of it. The general form of 
the extremities is rounded hexagonal, the anterior a little depressed, the 
posterior alittle compressed. The sides of the centra are quite concave. 
The chevron articular projections are quite prominent, terminating ante- 
