44 



INSECTIVORA 



From Wind River beds, H. wortmani Osborn. From Bridger beds, H. paulus, 

 minusculus Leidy. From Uinta beds, H. uintensis Osborn. 



Family 8. Mixodectidae Cope {Proglires Osborn). 



3-1.1,3.3. 



--r^VrrTT- Upper M not much broader than long, with conical outer and 



3-1.1,2.3. ^^ ^ 



small median tubercles, V-shaped protocone and weak hypocone. Lower and upper 



/-^ enlarged and forwardly inclined. I^ and I^ usually reduced or absent ; P^ and 



P. 2 likewise reduced or wanting ; P^ and P^ trenchant ; P^ at first with two tubercles, 



later becoming complicated. Lower M with five indistinctly alternating cusps, the 



two inner ones conical, protoconid and hypoconid y -shaped. Paraconid developed 



only as an edge. Trigonid not much higher than talonid, which becomes very large 



in the case of My 



The M are very like those of the Anaptomorphidae, wherefore the Mixo- 

 dectidae were formerly placed among the Primates. On account of the 

 enlarged I^ and the reduction of the remaining / and the foremost P, Osborn 

 took these animals for ancestors of the rodents and called them Proglires. 

 Because of the similarity of the M with those of Hyopsodontidae it might be 



recommended that they likewise be placed only 

 temporarily in the insectivores, although a certain 

 relationship with the Primates — Chiromys — does 

 not seem to be excluded. 



Olbodotes Osborn. With three lower I. Lower 

 Eocene, Torrejon beds ; New Mexico, 0. copei 

 Osborn. A similar M also known from the Fort 

 Union beds of Montana. 



Mixodectes Cope. J^ much enlarged ; Pg fre- 

 quently present. Trigonid higher than talonid. 

 Same formation and locality. M. pungens Cope, 



Microsyops Leidy (Fig, 71) {Limnotheritim, 

 Bathrodon, Mesacodon Marsh, Palaeacodon Leidy). 

 Talonid almost as high as trigonid. Wind River beds, M. scottianus Cope. 

 Bridger beds, M. gracilis Leidy, M. speciosus Marsh. 



Indrodon Cope. 2.1.3.3. Only uj^per jaw known. P simple. Lower 

 Eocene. 



B 



Fig. 71. 



A, Microsyops gracilis Leidy. Upper 

 jaw. B, M. ehyans Marsh. Lower jaw. 

 Bridger beds of Middle Eocene ; Wyom- 

 ing, i/i. (After Wortman.) 



Torrejon beds. 



Cynoclonfomys Cope, 

 beds. C. latidens Cope. 



Smilodectes Wortman. 

 Marsh. 



Metolbodotes Schlosser 

 nected with one another. 

 M. stromeri Schlosser. 



C small. P, M-Yike. Lower Eocene. Wasatch 



P^ short. 



Middle Eocene (Bridger beds). S. gracilis 



With three /. Tubercles of M inwardly con- 

 il/^>ilf2 and M.^M.y Oligocene ; Fayum, Egypt. 



2.1.2.3. 



Family 9. Plesiadapidae Lemoine. 



Lower jaw hiqh with broad coronoid process and diastema behind the 

 1.0.2.3. J if r 



enlarged I. Upper F^ bicuspidate, I^ and C small. Upper P and M tritubercular. 



