808 THE WHITE EIVEE FAXHSTA. 



Geolabis rhynch^us Cope. 



Plate LXII ; figs. 30-32. 



The muzzle of this species is long and narrow, with vertical sides and 

 convex superior surface, which is nearly straight in profile. The depth is 

 a little greater than the width, and the extremity is rather abruptly trun- 

 cated downwards and forwards. The nasal orifice is exclusively anterior. 

 The nasal bones are narrow, but widen regularly posteriorly. The palate 

 is moderately concave. The premaxillary bone presents a rather wide ex- 

 ternal face. The cranium expands just in front of the orbits, which are 

 well defined in front and above by a rather flat wide frontal region. 



The bases of the crowns of the incisors are subround. The second 

 premolar is separated from the first by an interspace as wide as that be- 

 tween the first premolar and last incisor. 



Measurements. 



M. 



Lengtli muzzle of No. 1 from front of orbit 0.0100 



Depth at miilcUe 0030 



Width at middle 0023 



Length estern.al face of premaxillary hone 0028 



Width of No. 2 between anterior borders of orbits 0070 



Interorbital width of No. 2 0060 



The cranium of this species is rather smaller than that of the Scalops 

 aquaticus. Tlie species was first described, but not named, under the head 

 of the genus Domnina, in the Annual Report of the U. S. Geol. Survey of 

 the Terrs., 1873 (1874), p. 469. 



INSECTIVORA. 



MENOTHERIUM Cope. 



Bulletin U. S. Geological Survey Terrs., I, January, 1874, p. 22. Annual Report U. S. Geolog. Surv. Terra., 



1673 (1874), p. 510. 



This genus is possibly a remnant of the lemuroid group of the Adap- 

 idce, so abundantly represented during the Eocene period; but as I only 

 possess portions of two mandibular rami with dentition, a more exact de- 

 termination will be looked for with interest. It is the first indication of the 

 existence of lemurs in the Miocene formation of the United States. 



There are at least two premolars and three molars in the inferior series ; 



