8 



BULLETIN 110, UNITED STATES NATIONAL MUSEUM. 



more perfect than the cranium to be described; and its importance is greatly en- 

 hanced on account of its forming a part of so perfect a skeleton as the present indi- 

 vidual. 



The occipital segment was largely articulated (as shown in fig. 4) when found, 

 but the other parts were detached though not far separated in the matrix. The 

 skull has been skillfully articulated by Mr. N. H. Boss, as shown in plate 3. The 

 missing portions have been restored by him, so that it now gives a very close approxi- 

 mation to its original shape and proportions. In some few instances, because of 



ar 



ex.inJ\ 



Fig. 1. — Skull of Antrodemus valens Leidy. Sideview. Cat. no. 4734, U.S.N. M. £ natural size, an, angular; ar, ar- 

 ticular; (ZjDENTARY; CC.p(,ECTOPTERYGOID; ei.m.f, EXTERNAL MANDIBULAR FORAMEN; /.FRONTAL;/', FIRST ANTIORBITAL FE- 

 NESTRA;/", SECOND ANTIORBITAL FENESTRA; j, JUGAL; la, LACHRYMAL; lat.t.fen, LATERAL TEMPORAL FENESTRA; mi, MAXILLARY; 



n, nasal; o, orbit; p, parietal; p.ar, prearticular; pf, prefrontal; pmx, premaxillary; p.oc, paraoccipita£; po.f, 

 postfrontal+postorbital; p, pterygoid; q, quadrate; qj, quadratojugal; sa, surangular; sq, squamosal. 



The dentary pertains to specimen Cat. No. 8335, U.S.N.M. See p. 25. 



distortion by crushing, it was necessary to compromise in regard to the exact 

 articulation of the elements, but in the main they joined up very accurately. 



The important parts missing maybe enumerated as follows: left premaxillary, 

 right maxillary, right prefrontal, left jugal, left quadrate, and quadratojugal. Of 

 the palatal region the left pterygoid and all bones forward of the ectopterygoids 

 are missing. The lower jaw is represented by the posterior half of the right ramus, 

 which lacks the coronoid, splenial, and the greater portion of the angular. The 

 dentary of a second individual No. 8335, U.S.N.M. of about the same size and pro- 

 portions was used in restoring the jaw as now exhibited, and as shown in figure 1 

 and also in plate 4, fig. 2. 



