Exo 



Fig. 15. Skull and lower jaw of Ccenolestes obscurus Thomas. Am. Mus. Nat. Hist. No. 

 10,559. Enlarged slightly more than three diameters. After Miss Dederer. 



A. Side view. a. o. r, Antorbital vacuity; nng', angle; .4s, alisphenoid; yls.ft?, alisphenoid 

 bulla; c, condyle; cor.pr, coronoid process; Exo, exoccipital; f.l.a, sphenorbital foramen; 

 /. r, foramen rotundum; f.v.f, venous foramen in frontal; Fr, frontal; L, lachrymal; l.d, 

 lachrymal duct; m.f, mental foramen; Ma, malar; Ms, mastoid; Mx, maxilla; Na, nasal; 

 Os, orbitosphenoid; p.gl.f, post-glenoid foramen; p.l.f, postero-lateral palatal foramen; 

 Pa, parietal; Pmx, premaxilla; pt. p, pterygoid process of palatine; s.sq.f, subsquamosal fora- 

 men; So, supra-occipital; Sq, squamosal; st.rn.f, stylomastoid foramen; Ty, tympanic; V^, 

 infra-orbital foramen. The * indicates the glenoid facet. 



B. Basal view. As.bl, alisphenoid bulla; a.pl.vac, anterior palatine vacuity; Bo, basi- 

 occipital; Bs, basisphenoid; c./, condylar foramina; car.can, carotid canal; car./, carotid fora- 

 men; ewsi./. Eustachian opening; £10, exoccipital; /. ov, foramen ovale ; /.Lp, foramen lacerum 

 posterius; iWa, malar; ilfs, mastoid; il/x, maxilla: Per, periotic (pars petrosa) ; p. (/L/, post- 

 glenoid foramen; PI, palatine; p.l.f, postero-lateral palatal foramen; pl.r, palatal ridge; p.pl. 

 vac, posterior palatine vacuity; Ps, presphenoid; Pt, pterygoid; pt.p, pterygoid process of 

 palatine; Pwx, premaxilla; s.sg./, subsquamosal foramen ; s^m./, stylomastoid foramen; tr.can, 

 transverse canal; Ty, tympanic. 



(210) 



