102 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



Plate 21 



Upper: Surface of an indurated layer of fossiliferous limesand, natural size, 

 from the marl pit at Vincentown, N.J., shown in the illustration below. 

 The flat side of a few examples of the ribbonlike branches of Coscinopleura 

 digitata Morton and the irregular fronds of Pliophloea sagena Morton are 

 visible, but most of the many bryozoan fragments present are very small 

 or are placed edgewise. 



Lower: Marl pit at Vincentown, N.J., which has supplied a large part of the 

 Bryozoa studied by the authors. The undulating line marks the uncon- 

 formity of the Vincentown limesand formation below and the overlying 

 strata of more recent age. The limesand is unusually fossiliferous at this 

 point, and sifting of the loose sand resulted in many millions of frag- 

 mentary Bryozoa. Certain beds have been cemented together producing 

 layers of harder rock, as shown in the upper figure. 



