7 6 



CRETACEOUS PALEONTOLOGY. 



in the subjacent Merchantville clay. The facts in regard to the 

 large community of species in these two formations have already 

 been touched upon in some detail under the discussion of the 

 Merchantville fauna, and need not be repeated at this place, ex- 

 cept to say that the most conspicuous species of each fauna are 

 either totally wanting or are exceedingly rare in the other one. 

 The most characteristic species of the Woodbury clay are Lin- 

 gula subspatnlata, Yoldia longifrons, Lucina cretacea, and Cypri- 

 meria cretacca, and not one of these has yet been observed any- 

 where in the Merchantville. On the other hand, Axinea sub- 

 aiistralis which is so abundant, and characteristic of the Mer- 

 chantville does not occur at all in the Woodbury, and the genus 

 Cucullaca is represented only by a single individual in all the col- 

 lections which have been studied from the higher bed. 



In passing to the faunas of the higher formations in the series, 

 a distinct alternation in the number of species common to the 

 Woodbury is shown, similar to the alternation of faunas to which 

 attention has been called in connection with the discussion of the 

 Cliffwood fauna, the Wenonah and Red Bank faunas having 

 more in common with the Woodbury than do the Marshalltown, 

 Mount Laurel-Navesink and Tinton. The following list of 

 species shows the alternation in the occurrence of members of the 

 Lucina cretacea fauna of the Woodbury, and to this list might 

 be added several others whose occurrence in the intermediate for- 

 mations is only sporadic. 



Axinea conge sta 



Pteria navicula 



Anatimya anteradiata 



Scambula p.erplana 



Lucina cretacea 



C.ardium dumosum 



Isocardia cliff wo odensis 



Cyprimeria cretacea 



Peronaeoderma georgiana 



Turritella quadrilirata 



Anchura pergracilis 



Tetracarcinus subquadratus . . . 



M 



W Ma 



We 



RR 



