I 34 KANSAS UNIVERSITY. QUARTERLY. 
Lestosaurus Marsh, Amer. Journ Ser, \une,rs72. 
Medium sized Mosasaurs. Premaxillary short and obtuse, pro- 
jecting very slightly beyond the teeth. Teeth slender, and recurved, 
faceted upon the outer side and striate on the inner. Nares much 
dilated anteriorly, situated forward. Frontal emarginated in the 
middle behind; pineal foramen large, situated near the frontal 
suture. Facial surface of parietal small, triangular in shape, the 
apex not extending beyond the middle of the bone. Prosplenial 
with a dilated wing-like process above. Quadrate large with a 
large suprastapedial process, reaching below the middle of the 
bone. Expanded portion of palatine short. Coronoid short and 
not prominent. Zygosphenes of vertebra rudimentary. Cer 
vical vertebra seven in number. Thoracic vertebra not more 
than fifteen in number, lumbo-dorsals nine or ten; pygial caudals 
five or six; chevrons large, articulated, spines of caudals regular in 
length, Limbs relatively large; arm and leg bones short and ex- 
panded; three or four carpal or tarsal bones present, closely articu 
lating; pollex and hallux shorter than the fourth digit, divaricated. 
Coracoid with a deep emargination. Pelvic bones large; ischium 
much expanded distally; pubis without antero-proximal process. 
The genus //olcodus Gibbes was proposed for the reception of a 
species supposed by him to be represented by three teeth from: 
Alabama, South Carolina and New Jersey... Two, of thess, were 
figured in his work cited (pl. iii, ff. 6-9), with the following des 
cription: ‘They are solid, and resemble in their pyramidal form 
those of Mosasaurus hoffmani antero-posteriorly, the dividing ridges 
making the anterior and posterior surfaces equal, and they are both 
convex. ‘They are also acutely pointed. In A/osasaurus the outer 
surface is plane or nearly so, and both have longitudinal narrow 
planes near the base. at In the teeth under notice, on the 
outer half are many planes, almost grooves, and also on the inner 
face, which is peculiarly striated toward the base. As the striated 
character is a structural distinction, the name //o/codus is given to 
’ 
the genus, and that of acudidens to the species.” Professor Leidy 
afterward* showed that only those teeth from Alabama belonged to 
a Mosasauroid, the ones from New Jersey being those of a croco- 
dile (/fyposaurus). He describes Gibbes’ type as follows: (op. 
cit.) ‘“The specimen has the enameled crown three-fourths of an 
inch in length. The base is elliptical in transverse section, and 
measures five lines antero-posteriorly, and four lines transversely 
The crown is nearly equally divided by acute ridges, which are im- 
*Oret. Reptiles of the United States, p. 82, foot note. 
