76 



CRETACEOUS PAEEONTOLOGY. 



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 subspatulata, Yoldia longifrons, Lucina cretacea, and Cypri- 

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

 where in the Merchantville. On the other hand, A.vinea sub- 

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

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

 Cucitllaea 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 Eaurel-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. 



M 



W 



Ma 



We 



N 



RB 



Axinea congesta 



Pteria navicula 



Anatimya anteradiata 



Scamhula perplana 



Lucina cretacea 



Cardium dumosum 



Isocardia cliff wo odensis. . . . 



Cyprimeria cretacea 



Peronaeo derma georgiana. . 



Turrit ella quadrilirata 



Anchura per gracilis 



Tetracarcinus subquadratus 



X 



X 



X 



