118 



PROCEEDINGS OF THE NATIONAL MUSEUM 



vor. S:i 



"•iZsii/^f^' 



HYI'OLAGUS FURLONGI. new Hpecies 



Fi(;ui{K 4 



Type. — Right ramus of mandible with incisor and P3 to M2 

 inclusive, Calif. Inst. Tcchn. Coll. Vert. Pal. no. 1321. 

 Locality. — Near Grand View, Idaho. 

 F o nnation. — Idaho formation ? 



Specific cJiaracters. — Size about equal to Ilypolagus limnetus. 

 Mandible of less depth and diastema between I and Pg shorter but 

 witli upper and lower teeth approximately as 

 lai-ge in //. liimielu^. P- with deep crenulaled 

 reentrant fold on ;uiterior surface and a shal- 

 low antero-ext(!i-iial gi'oove. P., triantjular in 

 in outline with antero-external fold sliallow. 

 Material. — The California Institute of Tech- 

 nology collection of lagomorpli remains fi'oni 

 near Grand View, Idaho, includes four frag- 

 mentary mandibles, no. 1321 to no. 1324, in- 

 clusive, exhibiting one to four cheek teeth 

 each. The type, no. 1321 (fig. 46), includes 

 also the incisor, but in this specimen P4 and 

 M, are not so complete as in no. 1322. A left 

 maxillary portion, no. 1325 (fig. 4a), referred 

 to this species includes the entire cheek tooth 

 f-eries. In addition to these there are several 

 nioi-e incomplete maxillary and jaw portions 

 and a iinmber of isolated teeth. 



Description. — The Grand View lagomorph 

 a])in'oaches closely in si/,(^ the small rabbit 

 IlypolaguH limnetus., from llagerman. The 

 maxillary portion equals in si/e and markedly 

 resembles that of //. livinctu.s. However the 

 first up])er cheek tooth exhibits a deeper 

 reentrant fold o?i the iintcrior face, which is in addition distinctly 

 crenulated. Kxti'rnal to this fold is a slight groove, which is some- 

 what slijillower than in //. limnettts. The remaining uj)[)er clieek 

 teeth of Ilypolar/us furlong'' •.\\)\)nv('\\{\y caiinol, be distinguislicd from 

 those in the Hagerniiui form. 



TIh^ depth of the lower jaws oi' II ypolayuH fnrloDgi is a little less 

 than in //. //nmetufi, and the diastenui between the incisor and P3 

 is appreciably shorter :dtiiongh th(> cheek teeth are about as large. 

 P;, aj)pears distinct fi'om llial in //. li'iiiiielns in being markedly trian- 

 gular in outline as viewed Iroin above. The postero-internal angle 

 of this (ootli is somewhat nioic acute. Tlie posterior external reen- 



F I G u R K 4. — llytiolanuH 

 furlonfji, new kjxmmch : 

 a, Loft iii.ixlllii witli 

 N II p c r 1 o 1' (Iciif ilioii 

 (C.I.T. no. i:525), (,(■■ 

 cluHal view, X - ; h, 

 i'i;;ht i-!UiniH of man- 



(lll)ll', t.Vp'! KlK'I'ilncil 



((;. I. T. no. i:;2i). 



lat.<;ral vii'W X 1. oc- 

 <: 1 II s a I view X -. 

 Oraml \'i('\v, Idalio. 



