SIMPLICIDENTATA 535 



4. Lisduff, Cavan. Hon. B. E. B. Fits 76. 11. 18. 1-2. 



Patrick (c & p). 77. 1. 18. 1-2. 

 2 6, st. Rathrobbin, King's County. Col. M. W. Biddulph 98. 2. 10. 1-2. 



(o & p). 



st. Donabale, Dublin. Charles Cobbe(c&p). 82.2.4.1. 



(Type of L. lutescens Barrett- 

 Hamilton.) 



3. Kilmanook, Waterford. G. Barrett-Hamilton 99. 2. 16. 1-3. 



(c & p). 



2 <5, 9. Kilmanock, Waterford. G. Barrett-Hamilton 9. 12. 15. 1-3. 



(c & p). 



6,9. Waterford. G.Barrett-Hamilton 9.10.4.1. 



(o & p). 8. 2. 27. 1. 



1. Bangor, Carnarvonshire, G. W. Assheton 3.1.28.1. 

 Wales. Smith (c & p). 



Sub-Oeder SIMPLICIDENTATA. 



1891. Simplicidentata Flower and Lydekker, Mammals, Living and 

 Extinct, p. 448. 



Geographical distribution. — Same as that of the order 

 Bodentia. 



Characters. — Upper incisors 1-1, their enamel covering not 

 extending to posterior surface ; distance between mandibular and 

 maxillary tooth-rows approximately equal, both pairs of rows 

 capable of opposition at the same time, the primary motion of 

 the jaws in mastication longitudinal or oblique ; premolars never 

 more than f ;£ ; incisive foramina moderate or small, not confluent 

 posteriorly ; bony palate never reduced to a narrow bridge 

 between premolars ; facial portion of maxillary entire ; fibula 

 not articulating with calcaneum. 



Remarks. — This sub-order contains the vast majority of exist- 

 ing rodents, among which about twenty families are now recog- 

 nized. Eight of these occur in Europe (for keys see pp. 481-483). 



Family ZAPODID^E. 



1875. Zapodidm Coues, Bull. U.S. Geol. and Geogr. Surv. Terr., 2d ser., i, 



p. 253. 

 1901. Zapodidm Lyon, Proc. U.S. Nat. Mus. xxxm, p. 666, May 2, 1901. 



Geographical distribution. — Boreal portions of both hemi- 

 spheres, east in Europe to Norway. 



Characters. — Skull and teeth with a general resemblance to 

 those of the Bipodidse though less highly modified ; but infra- 

 orbital foramen similarly large and with distinct supplemental 

 canal along inner border, and jugal in contact with lachrymal ; 

 hind legs much less specialized than in the related family, the 

 foot with five distinct metatarsals. 



Memarhs. — The family Zapodidse, though related to the 



