Art. 24 TEXAN PLEISTOCENE VERTEBRATES HAY 15 



the crown at the first crest, 100 mm. ; at the third, 101 mm. ; at tl}e 

 fourth, 93 mm. ; at the fifth, 85 mm. 



The bases of the anterior crest and a part of the second are pres- 

 ent. On the outer side they are worn down quite to the base of the 

 enamel; on the inner side the enamel rises not more than 33 mm. 

 The inner end of the first valley is present and exposes the remains 

 of a large tubercle which blocked it more or less. A considerable 

 part of the enamel of the third crest remains. The fourth shows 

 on tlie outer end a trefoil whose anterior lobe is large and meets the 

 hinder lobe of the trefoil of the third crest. On the front face of 

 the inner cone is a buttress which was worn down so as to present a 

 circle of dentine. This, with some tubercles, blocked the third valley. 

 No buttress is found on the rear face of the inner end of this fourth 

 crest; but at its base, as in the third valley, close to the midline, are 

 two tubercles. A small buttress is present on tlie front face of the 

 outer half of the fifth crest and aids in blocking the valley on 

 that side. The hinder face is expanded backward, but no distinct 

 buttress is formed. On the front face of the inner end of this fifth 

 crest is a buttress which on further wear would have produced a 

 lobe of a trefoil, imperfect only because no corresponding buttress 

 is developed on the hinder face. The talon is rather small and con- 

 sists of a large conule and a row of three smaller ones on the post- 

 trite side of it. 



On the outer side of the base of the crown is a distinct cingulum, 

 composed at the ends of the crests of a row of small tubercles, 

 while opposite the outer ends of each of the valleys is a large, 

 rounded tubercle. Similar tubercles are located at the inner ends 

 of all the valleys. The enamel is nearly everywhere more or less 

 rough and wrinkled. The valley between the fifth crest and the 

 talon is nearly filled by a mass of cement. A much smaller amount 

 is seen in the fourth valley at the midline of the tooth. 



This lower third molar must be compared with that of A. orar^ius. 

 However much they differ, however closely they agree, the jaws 

 testify that two species are present. It is evident that the molar 

 of A. defloccatus had crests less elevated than ttiose of A. orarius. 

 Also there is an evident tendency to the production of trefoils on 

 the posttrite side of the crests. The presence of a distinct cingulum 

 on the pretrite side of the crown and of the large, knoblike prom- 

 inences at the ends of the valleys distingish this species from A. 

 orarius. 



Doctor Francis presented to the United States National Museum 

 the lower right third molar of the type specimen of Anancus de- 

 floccatus^ and to this has been assigned the number 11,378. 



In the Francis collection from near Sinton is a small tooth of a 

 mastodon which is possibly a first milk molar, but which is taken 



