^903-] 



Hay, North American Cretaceous Fishes. 



19 



animal's life, they are now probably consolidated. The " pre- 

 dentary" of Felix was evidently the result of erroneous 

 observation. 



Lying against the inner surface of the posterior end of the 

 premaxilla (Fig. 10) is a bone whose edge bears a band of 

 three rows of teeth which resemble those of the presplenial, 

 some being two-edged, but most of them conical. This bone, 

 now 30 mm. long, but with its anterior 

 and posterior ends missing, I take to be 

 the palatine. Lying against the median 

 surface of the anterior end of this palatine 

 and extending forward nearly to the an- 

 terior end of the premaxilla is another 

 bone which bears a large patch of granular 

 teeth. It is possibly a part of the palatine. 



The writer sees little reason to doubt pig.io. Protosphyrcna 

 that the specimens referred to P. nitida by tzs^'Th Type of Z°: 

 Dr. Loomis, and figured on Plate xix, ^^U^'^u^- 

 Figs. 6, 7, of his paper here frequently 'Z'^^^^pT^l^^oi 

 quoted, really belong to P. dimidiata. Pi-^atine ;/;«.<•.. premax- 

 There is the same narrow maxilla; but, 

 especially, the dentary teeth are only slightly inclined for- 

 ward. 



Among the remains belonging to the type of P. dimidiata 

 there is present a single vertebra, apparently one belonging 



close to the head. It 

 is possible that this is 

 an intrusion, either at 

 the time of burial or 

 after collection ; but the 

 matrix is the same and 

 the bone is similarly 

 fossilized. The verte- 

 bra is represented in Figs. 11 and 12. It is 12 mm. long and 

 19 mm. in the transverse and vertical diameters. The ends 

 (Fig. 11) are deeply cupped. The arches have dropped 

 away, not having been coossified. The lower surface (Fig. 

 12) is ornamented with a network of low ridges. The verte- 



Fig. 11..^ Protosphyriena 

 ditnidiata (CopeK No. 



Fig. 12. f ProtospkyreEna 

 dimidiata (Cope). No. 



1635. X 5. Part? of type 1635. X ^. Part ? of type 



of Erisirhthe dimidiata of Erisiclithe dimidiata 



Cope. Vertebra, view of Cope. Vertebra, view of 



anterior end. lower surface. 



