Cope.] lo4 [Nov. 2, 



approach of the external face to the anterior or cutting edge is much more 

 abrupt than to the posterior. 



The teeth of the smaller saurian only differ from the others in their size. 

 The more posterior is probably anterior in position to those described 

 above, as its external face is more convex, especially anteriorly, and is not 

 faceted. Length of crown of the anterior tooth .032 ; width at base .019. 

 Width of base of posterior tooth .015 ; length .019. 



Pal^eoctonus atjlacodtjs, sp. nov. 



The teeth of this saurian differ from those of the P. appalachianus in 

 having their basal portion sculptured with parallel shallow grooves. These 

 are quite close together, leaving ridges between them which are narrower 

 than themselves. The surface of the crown displays the silky sculpture of 

 minute raised lines more distinctly than in the other species. But one 

 tooth of this animal has been so far obtained by Mr. Wheatly, and this 

 one is from the middle of the series of an animal rather smaller than the 

 second individual of the P. appalachianus. In accordance with this posi- 

 tion the crown is short and half conic with the external face strongly con- 

 vex, most so in front. The denticles are well exhibited on both edges, 

 but only descend on the anterior to the middle of the length of the 

 crown. In both large and small specimens of P. appalachianus the den- 

 ticles descend nearly or quite to the base. Length of crown .022 ; width 

 at base .011. 



Clepsysatjrus ve A-Txeianus, sp. nov. 



Represented by a single large tooth in perfect preservation. In accord- 

 ance with the characters of the type species, C. pennsylvanicus of Lea, the 

 tooth is straight, and possesses two cutting edges. The posterior of these 

 is denticulate and perfectly straight ; the other is less extensive and is sep- 

 arated from the posterior by very unequal surfaces. 



In the present saurian the tooth is compressed, and rounded in front, 

 the section throughout the basal half being an oval with one end acute. 

 The antero-interior edge only exists on the apical half of the crown, and is 

 separated from the posterior edge by a somewhat convex face two-thirds 

 the width of the external face. It is not denticulated, and its lower 

 extremity falls behind the anterior margin of the crown when viewed in 

 profile. The enamel is perfectly smooth. Length of crown from base of 

 enamel layer .047 ; longitudinal diameter at base .018 ; transverse do. 011. 



As compared with the G. pennsylvanicus of which several teeth are 

 known, the C. veatleianus differs in its more compressed form, and in 

 having the anterior cutting edge not denticulated. The position of this 

 edge is more internal than in the longer known species, but this may indi- 

 cate a more anterior position in the jaw. 



This saurian is named in compliment to Charles M. Wheatley, A.M., of 

 Phoenixville, Pa., to whose exertions we owe nearly all the material hith- ' 

 erto obtained from the Triassic formation of Pennsylvania. 





