80 VERTEBRATA. 



No. 103. Tapirns Arvernensis, Croiz. and Job. 



Lower Jaw. This contains six molars, and is from the same locality. 



Size, 11 x 6. Price, $2.25. 



No. 104. Lophiodon Parisiense, Gerv. 



Lower Jaw. This tapiroid Mammal, the Tapirotlierium of De Blainville, 

 is known only by imperfect fragments, though Cuvier established the genus so 

 early as 1800. It has the same dental formula as the Tapir ; but the premolars 

 present a more simple structure, the lower series having the crown compressed 

 and forming two cones, and the last two in the upper jaw having only one' cone 

 on the inner side. This jaw was found in the calcaire grossier (Middle Eocene) 

 near Paris, and is in the Garden of Plants. Size, 13 x 6. Price, $4.00. 



No. 105. PliolopllUS VUlpicepS, Owen. 



Skull and Lower Jaw. This odd-toed, 

 hoofed Herbivore stood intermediate between the 

 Tapir and Palasotherium. The skull has a 

 straight upper contour like that of the Horse ; 

 while that of the Palaeotherium and Anoplo- 

 theriurn is convex. As in the Hog and Palaeo- 

 therium, the greatest cerebral expansion is at the 

 middle and toward the fore-part of the temporal fossa?, with a contraction toward 

 the occiput. The orbit is higher than in the Rhinoceros, and lower than in the 

 Hog. The dentition is like that of nearly all Eocene quadrupeds, a type not ex- 

 hibited by any later or existing Mammal, namely : three incisors, one canine, 

 four premolars, and three molars in each ramus. This interesting fossil was dis- 

 covered in the London Clay (Eocene) of England, and is now in the British Mu- 

 seum. Price, $1.25. 



No. 106. Palaeothermm crassum, Cuv. 



Head. The dis- 

 covery of the P. — one 

 of the most character- 

 istic Mammals of the 

 Tertiary world — form- 

 ed an epoch in the his- 

 tory of fossils. The 

 creature resembled 

 the Tapir in the shape 

 of the head and the 

 possession of a short 

 proboscis ; but it had 

 only three toes on the 

 forefoot, and the mo- 

 lars resembled in form 

 those of the Rhino- 

 ceros, though agreeing in number, kind, and general arrangement with the den- 

 tition of the Pliolophus. The canines were longer than the other teeth, and 

 there were consequently vacancies in the series for the lodgment of the crowns 



|%^^^S^S^3 



BSteaawsm^^i^^g^^wK^^ 



