458 0. C. Marsh—Structure of Mosasauroid Reptiles, 
the external margin of the hook, and hence the inner angle 
is much greater than a right angle. There is a broad, shallow 
depression on the front face of the ala near the middle, and 
below this a deep pit on the inner face above the internal angle 
of the distal end. The anterior margin of the distal articular 
face is strongly reflected near the mi 
The cervical vertebrz are short, with broad transversely oval 
faces, faintly emarginated for the neural canal. The axis has a 
short spine, much elongated fore and aft, and with caps of car- 
tilage at its anterior and posterior angles, connected by an ob- 
tuse ridge. The hypapophysis of the axis stands on the middle 
of the centrum, and the articular faces for these processes are 
nearly round, and rest on a prominent ridge, as in Hdestosa 
mainly produced by the deep excavation of the infero-lateral 
surfaces of the centra. The dorsal vertebrae have neural spines 
much extended antero-posteriorly, and abruptly truncated. 
Measurements. 
Depth of maxillary at anterior nareal expanse, i 
Width of frontals at posterior margin,----------------- 115 
Wreath ty (Ont Of Orbe, 2255 oe Oe ee 
Distance from center of occipital condyle to end of suspen- 
NI i er ts ees Shee 90° 
Expanee of: suspensoria,. 650. ase ee 170° 
Length of stapes, os. gcc ke etic st eee 
Length of columella, Soe ne eee 51° 
RUBE abr anMirabee see oe cd eee eae oe 81° 
Transverse diameter of distal articulation,. ------------ 39 
Hptero-posterior diameter, .... ... ..--<.<+--++ -naneee4 20° 
Lapoth of postenor hook oes 54° 
Length of axis without odontoid PEGCGEE, <i eee eee 48° 
Rerana. dianietér of Dale us ee 21 
Transverse diameter, _...._.-___- eanetse 32 
Length of anterior dorsal vertebra,.........2-++e00 09" 60 
sransverse disineter of ball: -. os. es os ccm ca ee 38 
Weta Giatieter fo re rt Sere 32° 
‘The remains on which this species is established were ob- 
tained by the Yale party last summer in the upper Cretaceous 
yellow shale, near the Smoky Hill River in Kansas. 
Lestosaurus latifrons, sp. nov. 
