322 SUPPLEMENT. 



M. 3487. An imperfect cranium and several specimens of the 

 maxilla ; from the Pleistocene breccia of Mont San Gio- 

 vanni, Sardinia. Purchased, 1886. 



M. 3487 a. Several mandibular rami ; from the same locality. 



Purchased, 1886. 



M. 3487 h. Specimens of the humerus, radius, ulna, femur, tibia, 

 and astragalus ; from the same locality. Purchased, 1886. 



Genus EUMYS, Leidy \ 

 This genus, according to Cope ", is distinguished from Hesperomys 

 (pt. i. p. 299) by the upward extension of the orbital fossae to form 

 an interorbital crest ; but some species of the latter show the same 

 feature. Schlosser^ considers that it is probably identical with 

 Cricetodon (pt. i. p. 228), which appears the common ancestral type. 



Eumys elegans, Leidy''. 



This is the type and only described species ; the series of cheek- 

 teeth is as long as in Mus decumanus, but the muzzle is shorter. 

 Hah. North America. 



M. 2563. Two imperfect mandibular rami, showing the molars ; 

 from the Miocene of the White Eiver, Colorado, U.S.A. 

 Similar specimens are figured by Cope, op. cit. pi. Ixv. 

 figs. 9-13. Presented by 11. Lydekker, Esq., 1885. 



Genus ARVICOLA (pt. i. p. 230). 



Arvicola henseli, Forsyth-Major ^ 



Apparently allied to A. nivalis and A. hrecciensis. 

 Hah. Sardinia. 



M. 3488. Several specimens of the imperfect cranium and mandible; 

 from the Pleistocene breccia of Mont San Giovanni, Sar- 

 dinia. Purchased, 1886. 



M. 3488 a. Specimens of the humerus, ulna, femur, and tibia ; from 

 the same locality. These specimens were determined by 

 the founder of the species. Purchased, 1886. 



1 Proc. Ac. Nat.. Sci. Philad. vol. viii. p. 90 (1856, vol. dated 1857). 



'^ Vertebrata of the Tertiary Formations of the West (Eep. U.S. Geol. Surv. 

 Terr. vol. iii.), Book i. p. 848 (1884). 



3 Paleeontographica, vol. xxxi. p. 137 (1884). ^ Loc. cit. 



" The specimens were sent to the Museum with this unpublished name 

 attached. 



