no. 1702. ,1 NEW FOSSIL CROCODILE GILMORE. \\)\ 



of the right maxillary. In the Left ramus of the lower mandible are 

 the fourth and seventeenth, with the base of the twelfth and in the 

 portion of the right ramus is the base of the third and a young tooth 

 in the eighth alveolus. Taken in the order mentioned above, the 

 crowns of the teeth give the following measurements in millimeters, 

 the first of each pair of numbers being the height; the second, the 

 basal or antero-posterior extent: First, 4.. 5 — :>..">; fourth, 9 (tip broken 

 off)— 7.5; sixth, 6—5; eighth, 4.8 1: twelfth, (i 6; thirteenth, 

 5 — 5.7; seventeenth, 3.2—4.7; eighteenth, 2.5 4.5. Right side, 

 seventh, 5 — 4.1; eighth, 5.1 4.5; ninth, 5 •">.(;. 



Most of the teeth, excepting those enlarged, are much the same 

 shape, with short, compressed subacute or obtuse crowns. The 

 crown bears on each side a distinct, sharp-edged ridge placed a little 

 toward its inner face, and unworn crowns extending from the apex to 

 near the base. These ridges or carina define laterally, on the shorter 

 teeth of the series, an area on the inner surface that is less convex and 

 slightly less in breadth than the outer surface. In most of the 

 enlarged teeth these ridges are placed nearer together and define an 

 area on the inner side, the breadth of which slightly exceeds one-third 

 the circumference of the tooth. The crowns of all the smaller teeth 

 are separated from the fang by a slight constriction or neck. 



The larger teeth in cross section are more rounded and proportion- 

 ally narrower transversely than the smaller, but somewhal more 

 curved. A scrutiny of the measurements given above shows that the 

 crowns of the posterior teeth are greater in width than in height, 

 while in advance of the tw T elfth maxillary tooth the height is greater. 



The anterior pair of premaxillary teeth are close together, being 

 separated on the median line by a narrow 7 slit, which emerges dorsally 

 into an enlarged rounded foramen. The one preserved tooth of this 

 pair is small and comparatively slender. The first pair is separated 

 from the alveoli of the second pair by deep pits for the reception of 

 the anterior mandibular teeth, which do not perforate the upper 

 surface as in some extinct and all modern crocodiles. The second 

 pair are small and in close contact with the alveoli for the third pair, 

 which are much enlarged. The fourth pair appear to be a trifle larger 

 than the third, from which they are separated on the inner side 1>\ a 

 pit. The fifth and last pair in the premaxillaries are very small and 

 in dose contact with the fourth. 



Between the fifth pair of the premaxillaries and the lirst of the 

 maxillaries are elongated notches (anterio-posteriorly they measure 

 15 mm.) which receive the two enlarged teeth of the mandibular 

 series. 



The first three maxillary alveoli are rather small, though they 

 increase in size from front to back. The fourth and fifth are much 

 enlarged, and, judging from the size of the alveolus, the fourth is the 



