464 0. C Marsh—Structure of Mosasauroid — 
asurements. Rey: Acre tee 
Width of frontals between aes angles, .... 6.06. 56.124 am 
Distance from parietal foramen to end of uspensortany. 170° 
Caeeth « of  dentigerou portion of palatine,............. 164° | 
MAES OE TN, ick oc cancies vt ne escéeonue die 124° 
Length of igthties, KA eGR RONN 9b oo 8n 0d eeu ee gee 6 ecg eee 102* 
RRO. OUI Bsc oes es Ln s nc sccu cs codec ee 108 
path Of feniat ei i. ois vd as 135 84 
Transverse diameter of proximal end, 16 ¢in db amine 42 | 
Transverse pyases: OS Wet! ONG. os. cee cee 47 
osterior cervical vertebra, eer ern oe » 44° 
Vertical Ped es OF TAM ts ce deeens ses 24° 
A PMNOVORMG (IMME 8 os eis coves av sqsvi te mn eeakas 29'5 
ngth of & dorsal vertebra, 2... 0... oes ode a 6 
Length of anterior caudal,....... o\s'nakvws aEveees nee ae 
Vertical dimmeter of ball 2... es aa 38° 
avamsverte Gidmetee!: 600.640. ASA ee aa ee | 
This species differs from Clidastes cineriarum Cope, in the — 
transverse articular faces of the dorsal vertebrae; from Hudesto- 
i 
saurus tortor Cope, and #. dispar Marsh, in the less number of 
palatine teeth, and in other characters. E. stenops te Vows the 
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Tie Vymani “Mars , = Chidastes omen Marsh, 
Ope. 
Yale College, New Haven, Ct., May 15th, 1872. 
eRe OF PLATES. a sh y 
Plate X. Right anterior ere > searecna ing pa. 8 
Lestosaurus 
saurus dipar (p. 451). Weare 1, a, coracoid; 8, 
2, a, ilium; 0, ischium; ¢, pubis. se 3, ia quadrate, — 
view , 4, left quadrate, posterior view. 
Plate XII. Figure u Right side of pelvic arch ra right femur of Bistro 
463). a, ilium; }, ischium; ¢, pubis; 4, a pi 
Right side of pelvic arch and righ 
453). a, ilium; }, ischium; ¢, pubis; d, fog Side view 
med by pressure. (} na s 
Plate XIIL Figure 1 side of pelvic arch and left femur of cateearnee S 
lium; 6, ischium; ¢, pubis; d, femur. Figure 2. Muzzle of # 
, seen from below. 3. Muzzle of L ga 
inferior view. Figure 4. Left quadrate of Lestosaurs 
latifrons, r 
Jez, anterior view. (4 natural size.) 
