THE WOODBURY. 77 



Besides that element in the Wpodbury fauna which is recurrent 

 in the Wenonali or Red Bank, a large element, 32 species in all, 

 has as yet been recognized nowhere in New Jersey outside of the 

 Woodbury. Among these species which are restricted entirely 

 to the Woodbury we find one, Yoldia longifrons, which has been 

 identified from every locality which has afforded a Woodbury 

 fauna, and which, at Lorrillard where the most extensive collec- 

 tions have been made from this formation, is one of the most 

 abundant species, individually. Another species of this same sort 

 is Cancellaria subalta which has been identified from each of the 

 Woodbury localities but one, and which is again an abundant 

 species in the Lorillard collection. This species, however, has 

 one occurrence in the Merchantville, although but a single indi- 

 vidual has been observed in a large collection. 



A notable characteristic of the Woodbury fauna shown in fol- 

 lowing it from the more northern to the more southern localities, 

 is the decrease in average size of some of the more abundant 

 species. A group of species occurring both at Lorillard and near 

 Haddonfield, and including such characteristic forms as Yoldia 

 longifrons, Lucina cretacea, Cyprimeria cretacea, Cancellaria 

 subalta and others, are conspicuously larger in the former locality 

 than in the latter, the largest individuals at Lorillard being fully 

 twice the size of the largest individuals of the same species at 

 Haddonfield. The reason for this difference is doubtless to be 

 found in the varying local conditions of environment at the time 

 when the faunas occupied the region, the more northern part of 

 the area furnishing more congenial surroundings for the robust 

 development of the typical Lucina cretacea fauna than the region 

 further south. In this same connection it may be noted that the 

 differentiation between the Merchantville and Woodbury faunas 

 is more sharp at the north than at the south, the mingling of the 

 species of the two faunas, already noted, being more conspicuous 

 to the south. 



