Cope.] 
[Aug. 14, 
In a second specimen of about the same size, parts of two costal bones 
are preserved, They are thick, and display the usual costal and vertebral 
scute-sutures. The latter one in a groove, for the middle of the vertebrals 
is elevated, and the costals project shoulder-like just outside the groove. 
In a third specimen a little larger, xiphisternals with several marginals 
are preserved, A free posterior marginal is regularly recurved, and the 
seute-sutures are deeply impressed. The marginal scuta have evidently 
been marked with concentric grooves within their margins. The first 
marginal bone of the bridge has a very obtuse edge. 
In none of the specimens are the surfaces sculptured. 
Measurements. 
No. 1. M. 
WIG DIARDEOM ay ARIA nae hens ev eure syn 720,080 
Length plastron from axilla (approximate)......... fie. UD 
Thickness hyosternal at mesosternal.......... ie ae AUUU 
ud ot ~ yposterntl, ain, . 5. ae ce sOUGD 
Width mesosternal.....1..5.% Mogae ee ey Te marge AUL3)06 
Length Bee ah etiy tes Pisa eebtN eee ee ae we Ue 
Thickhessrofa vertebral. ssi vas vices seen ees 006 
os ‘Oy Xiphistermal (morn) / ic. ce s7 v. ona. e004 
“ AG UDI ees lass sie ces .007 
No. 2. 
Thickness costal at hump.......... Vinee iat Wine Glens 0075 
Width of costal...... Daal esti Bs ant oka Geren vara 0175 
No. 3. 
Width Of postenonr Marcitial.. 6.6.05. von. tinea ud. 027 
Length Be Hae ea re nue n chee ae Voeeee ED 
The mesosternal, though found with No. 1, do2s not fit it exactly and 
does not belong to it. 
NovToMoRPHA GRAVIS. Cope. species nova. 
This species is known by portions of one, and probably of other speci- 
mens, The typeis larger than any of the last described, and equalled some 
of the Cheloniae of the ocean indimensions. The tight hyosternal bone 
indicates both resemblance and difference from the NV. testudinea. The 
former is seen in the internal thickening parallel to the margin, bounded 
behind by a deep groove extending to the axilla. <A peculiarity, in which 
it differs from the NV. testudinea, is seen in the posterior position of the 
humero-pectoral dermal suture, which originates at the axilla. The epi- 
hyosternal suture is concave. The thickened portion of the episternal 
margin is shorter and wider than in the species just named, the width 
being to the length as 2.5 to 2; in WV. testudinea, as 1.5 to 2. 
M. 
Thickness of hyosternal anteriorly........... ere bees QOL 
Width of costal, (?)second specimen.............. He O08 
Surfaces not sculptured. 
