6 CRETACEOUS PALEONTOLOGY. 



soft and fr,iable condition have been given the same treatment 

 with most satisfactory results. In immersing the specimens in 

 the paraffin a wire basket has been found most convenient. They 

 have been carefully arranged in this basket to be lowered into 

 the vessel containing the molten paraffin, then after having been 

 allowed to remain in the paraffin for a sufficient length of time 

 they can be removed without injury, to be spread out to cool and 

 harden. 



During the preparation of the report it became desirable to 

 make more careful comparisons of the material than could be done 

 from the literature alone, with species of similar age from the Gulf 

 border states. For the opportunity to make such comparative 

 studies I am under great obligation to Dr. T. W. Stanton of 

 the U. S. Geological Survey, who- allowed me unlimited access 

 during an entire week to the extensive collections made by him- 

 self and preserved in the U. S. National Museum, from the 

 Upper Cretaceous of the Gulf border region. To Dr. H. A. 

 Pilsbry, of the Philadelphia Academy of Science, I am also 

 greatly indebted for the courteous manner in which he gave me 

 every facility for examining and studying the collections from 

 the New Jersey Cretaceous preserved in the museum of the 

 Academy. Through his cooperation also, and that of Dr. Gilbert 

 van Ingen, it has been possible to reproduce in the plates many 

 of Whitfield's types which are in that museum. These collec- 

 tions have been of special value in connection with the work, 

 containing as they do the larger number of types of species de- 

 scribed by the earliest workers in the field. Prof. J. V. Lewis, 

 of Rutgers College, has also most generously placed the nu- 

 merous types of species described by Whitfield, preserved in the 

 museum of the college, in my hands for study and comparison. 

 For assistance in the preparation of the chapter on the Bryozoans 

 from the Vincentown limesand I am profoundly indebted to Dr. 

 R. S. Bassler of the U. S. National Museum. All the identi- 

 fications of these forms were made by Dr. Bassler with the 

 assistance of Dr. E. O. Ulrich of the United States Geological 

 Survey, all the new species were recognized by them, and notes 

 on their characteristics furnished the writer for use in the pre- 



