28 KANSAS UNIVERSITY QUARTERLY. 
MEASUREMENTS. 
MM 
eng thyoferostruin jabra omen bey ere ete eerie te eee bese Feel) 
Transverse diameter 136 mm. from anterior extremity................. 34 V3) 
Transverse diameter, 22mm) fromvantenonextremity. .. ee eee 22 
Protosphyrena, sp. nov, 
Established upon a right premaxillary from the Niobrara Creta- 
ceous, the exact locality not known. The material upon which this 
species is based is too scanty I think to justify a specific name being 
given to it until more complete specimens are found. It may 
prove to bea synonym of P. penetrans or P. xiphoides when speci- 
mens of these are found with the premaxillary attached, but for the 
present at least it will have to regarded as a new species. 
When viewed from the side, the bone is triangular in outline 
with a thin superior and posterior border. The anterior extremity 
is broken away but was probably acutely pointed as in P. nitida. 
The difference which characterizes this form from P. nitida are the 
size and arrangement of the teeth. Near the center of the bone 
there are alveola for four large teeth, the three anterior of which 
are preserved nearly complete, the posterior of these is broken off 
at the base but it and the anterior one seem to be the smallest of the 
four. The two in the center are of about the same size; they are 
all directed. forward, the anterior slightly more than the rest. 
These teeth all have broad lanciform crowns with sharp anterior 
and posterior cutting edges and slightly striate enameled surfaces. 
Just back of the most posterior of these there is a row of small 
teeth, the anterior of which are hardly more than bony tubercles 
but posteriorly they assume definite dental characters; ten of these 
are present in the specimen. There are other teeth like these 
present on the anterior portion of the border, the exact number of 
which cannot be determined, owing to the tip of the bone being 
broken away. The maxillary surface contracts toward the ante- 
rior, and is bounded below by a narrow shelf of bone extending 
inward. 
MEASUREMENTS. 
Approximateslengthrohetne ralveo lait on Or Cian ae een eee 82 
Depth just back of last large tooth...... 555 he, < | Peeps Ie Pe Pea ea ee 27 
HMeightottirst large toothitew. . tha stun cone te Come Ree Cee eee 15 
Height ottsecond large stooths: . a eee cee een eter 1. ag 
engthvol rst large. tooth ts oc. eee eee tee CE Eee Aa 8 
ength. of ssecondilarse toothte ere ec nn ere tat eee aera, |) 
The species of Profosphyrena now known are as follows: 
a 
