NO. II 



FOSSIL TOOTHED CETACEAN TRUE 



The crowns of the teeth, which are of a very dark brown color, 

 are short and conical, and elliptical in section at the base. They are 

 strongly curved inward, or a little backward, from about the middle 

 of the height. The enamel is distinctly rugose and there is a clearly- 

 defined, longitudinal postero-internal ridge, and also an antero-ex- 

 ternal ridge. The latter is bifurcated in the lower half. The cin- 

 gulum is represented only by a small tubercle at the base of the 

 internal ridge. The crown is slightly constricted below this point. 

 The base of the crown appears oblique owing to wear or splintering 

 of the enamel on the outer side, but was probably not so originally. 

 The apex of the crown in two of the teeth is obliquely truncate as 

 a result of attrition, the upper exposed surface being quite flat. In 

 the other two teeth only the extreme tip is abraded and the ex- 

 posed worn surface is nearly at right angles with the longitudinal 

 axis of the crown. The dimensions of the teeth are as follows : 



The four teeth, of which measurements are given above, differ 

 somewhat in their characteristics when compared with each other. 

 Tooth Xo. i is from the left side, if a lower tooth. It is the smallest 

 of the four and the crown is most strongly recurved. The antero- 

 external ridge of the crown is nearly obliterated, but appears to be 

 widely bifurcated at the base. On this account and because of the 

 curvature of the crown it may be a posterior tooth, and belong be- 

 hind the other three. The anterior side of the crown is worn away 

 by abrasion, leaving a large, flat, elliptical and nearly vertical sur- 

 face devoid of enamel. Tooth No. 2 has the largest crown of the 

 four and the crown is also more compressed than in the other teeth. 

 The bifurcation of the anterior ridge extends upward only a little 

 way from the base. This tooth is only slightly curved inward and 

 backward. Teeth Nos. 3 and 4 are almost identical in form and 

 size. They are perceptibly larger in diameter than No. 1, and the 

 crown is somewhat gibbous near the base. The apex is worn away, 

 leaving a large, oblique, elliptical surface devoid of enamel, but was 

 originallv stronqlv curved inward and backward. The anterior 



