156 CRETACEOUS AND TERTIARY FISH. 



Portion of mandible with rami nearly parallel, below through 

 whole extent of fragment in contact apparently united by suture. 

 Posteriorly on each a smooth shallow cavity. Near hind end 

 appearance of suture, most distinct on left side. Dental bone 

 with single row of alveoli continued in front for teeth. Just 

 below alveolar border a series of foramina, one foramen to each 

 alveolus. Teeth of mandible (crushed?) close within upper. 

 Just within dental bone on left side rectangular portion of unde- 

 termined bone. Premaxillaries very distinct, united behind by 

 squamous suture to upper maxillary, and apparently lachrymal, 

 anteriorly premaxillaries rounded, and hind portions each side 

 with four or five teeth. A lachrymal between premaxillary and 

 maxillary on each side, deep groove on its front portion passing- 

 forward and down becomes smaller as it descends. Each lachry- 

 mal with small smooth superficial groove on upper portions, inside 

 small smooth, slightly convex, apparently articulating surface. 

 Maxillary above and in front, near junction with lachrymal, 

 with smooth convex articulating surface inclining little inwards 

 and alveoli for teeth distinct. Near alveolar edge, on inner sur- 

 face regular series of foramina. Outer surfaces of maxillary and 

 premaxillary with shagreen appearance. Teeth in both jaws 

 close together, uniserial, in distinct alveoli, similar or mandibular 

 rather more compressed, and anterior of latter also smaller than 

 posterior. Crowns of teeth enameled, smooth, land form, slightly 

 inclined inwards, and those at hind part of mandible slightly 

 curved forward. Roots hollow, slightly grooved externally, and 

 very slight groove internally. Apparently 9 or 10 intermaxillary 

 teeth and about 30 in each maxillary. Length about 87 mm. 

 (From Hays.) 



Formation and locality. The type was found in the upper 

 Cretaceous marl of Pensauken creek 5 miles southeast of Moores- 

 town (J. Brick). [The headwaters of Pensauken Creek originate 

 in the belt of Navesink-Hornerstown marl south of Mount 

 Laurel, so 1 that the specimen may be referred to that horizon, K.] 

 I have not examined any examples unless a detached tooth from 

 the marl at Allowaystown [Miocene, K.] (H. C. Yarrow) is 

 identical. 



