8 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 60. 



Fig. 5. — Left lach- 

 rymal OF Saniwa 



BNSIDENS LEIDT. 



T Y p E J Cat. No. 

 2185, U. S. N.M. 

 Natural size. A, 



LATERAL VIEW ; B, 

 POSTERIOR VIEW. 



length. Viewed from above, the outer border, which stands up as 

 a vertical plate, curves in toward the median line and nearly if not 

 quite meets the ridge on the vomer of the opposite side. From this 

 point forward the outer border curves outward to meet the maxil- 

 lary. The anterior ends of the vomers are missing in the type, as 

 shown in plate 1. 



Ecfopteri/goid. — Both ectopterygoid bones are 

 present, but the right element is the more perfectly 

 preserved. It is a curved bone, having a bifurcated 

 posterior end that straddles the small outwardly 

 turned process on the pterygoid, lapping above and 

 below, thus forming a strong union of these two 

 bones. Its curved and rounded inner border forms 

 the greater part of the outer boundary of the in- 

 fraorbital vacuity. The anterior end tapers out 

 to an obtuse point having a groove on the external side that joined the 

 posterior end of the maxillary. The anterior, outer border was in 

 sutural contact with the jugal for half its entire length. Its greatest 

 length over all is 16.5 mm. 



Lachryinal. — The left lachrymal is almost perfectly preserved, 

 lacking only a little of its external posterior border. Viewed from 

 the side, it is a flat bone, subtriangular in outline, with a thickened 

 posterior border that is slightly concave vertically. This end, 

 which contributed to the boundary of the orbit, is perforated by two 

 oval foramina, one above the other. The larger is above and sepa- 

 rated from the lower one by a very narrow filament of bone. These 

 appear to have a common exit on the me- 

 dian internal side of the bone. In Vara- 

 nus the lachrymal is perforated by the 

 usual lachrymal foramen, but the larger 

 and more dorsal foramen of Sankoa is in 

 the Varanus, represented by a notch, the 

 inner border being formed by the lower 

 branch of the prefrontal. A striated ar- 

 ticular surface on the postero-inferior 

 border appears to indicate the point of 

 articulation with the forward end of the 

 jugal as in Varanus. Its greatest length is 7.5 mm. ; greates*; height, 

 6.5 mm. 



Maxillaiy. — Both maxillae retain their natural relationships to 

 the interposed palatal bones as shown in plate 1. The right is the 

 better preserved, though it lacks the anterior extremity and a portion 

 of the median superior border. In so far as comparison can be made 

 it closely resembles the maxillary of Varanus. The principal differ- 



mt 



'fp-^ 



Fig. 6. — Right maxxllahy of 

 Saniwa ensidens L e i d t . 

 Type, Cat. No. 2185, U.S. 

 N.M. Natural size. Lat 

 BRAL VIEW. na, border 

 that contributes to the 



boundary op the EXTERNAL 

 NARIAL OPENING. 



