Cope.] a0 : {March 3, 
Measurements. M. 
Length centrum anterior lumbar...........---+s eer tere ee 055 
Diameter cup do. oo. eee eee eee eee eee eee eens 042 
a neurapophysis d0..... 2.2... cece eee eee eens 048 
ee a COLSAle ns svansielei dc ecg eRe IA AES 027 
a cup of centrum ‘6... eee eee eee ee eee eee eee 035 
Length base bypapophysis.....-..--.. 5 see eee eee eee rene 03 
Length centrum median cervical...... 26.6... eee eee eee ee 051 
Width cup eS GC See Rea ea RAE woineer oe ea. .037 
Depth ‘ Ge (| agin Saige eA ee 085 
af ee anterior GO. 3 ging adem Ree RATS 029 
Width <‘ SSL adaitieebasudws Seen eee 082 
“ between post. marg. parapopbyses.........--+--+ 045 
Depth of centrum to lower edge......... Hunees ween testes 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. 
I am indebted to Judson C. Gaskill for the opportunity of examining 
this interesting fossil. 
DINOSAURIA. 
HapnrosaURUS 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 ZH. tripos or H. occidentalis, and in a less 
degree smaller than the If. foulke’?. The remains consist of four caudal 
vertebre 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 vertebra 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 a little compressed. The sides of the centra are quite concave. 
The chevron articular projections are quite prominent, terminating ante- 
