148 Rev. George Bailey, on Foraminifera, <6c,, in Flint, 



exhausted in the preparation of these slides, and I hope to 

 extend my series from the remainder of the rich material this 

 excursion yielded. 



So far, I have not mounted many of these organisms as trans- 

 parent objects, because most of those mounted in balsam become 

 so transparent as to be almost invisible. Nor have I determined 

 all the species that comprise this series, not being able to name 

 them all. Some differ from anything that I have seen described 

 or figured in such works as are accessible to me. 



There are seventy slides on the table. These slides contain 

 fifteen species of Foraminifera, six of Polyzoa, five of Sponge- 

 remains, three of Entomostraca, one small Brachiopod, and 

 six species that I have not classed in any of the foregoing 

 groups. 



Tlie largest group consists of well-preserved Foraminifera. 

 The genera represented are GlobU/eriiia, TruncatuUna, Cristellaria, 

 Maryinulina, Xodusaria, Dentalina, Textularia, Frondiculana, 

 Gaudryina, and Hnplophraiimium, and doubtless many other 

 genera can be included. There is a Nodosanan in this series 

 well-marked, and unlike any I have met with previously. But 

 the most curious and interesting form, which I take to be a 

 Foraminifer, is a somewhat irregular lobed tube, covered with 

 small yet distinct spines. At first I had only two examples of 

 this organism. Further examination yielded seven more ; and 

 yet another specimen has since been derived from the interior of 

 an Echinus obtained in a chalk-pit at Farningham Road, Kent, 

 making ten specimens in my collection for comparison and 

 determination. 



Another group consists of Polyzoa. I have not made this 

 class a study, and do not even attempt to indicate the genera 

 which are represented. The specimens will speak for themselves 

 with more eloquence than I could command. 



Then there is a group of spicules and skeleton-fragments of 

 Sponges. Dr. Hiude has been singularly fortunate in this 

 department, as will be found on reference to his memoir on 

 • Fossil Sponge-spicules from a Hollow Flint in the Upper Chalk 

 at Horsted, in Norfolk.' Dr. Hinde described and illustrated 

 160 forms of spicules, referring them to thirty-eight species of 

 thirty-two genera of Sponges. The series which I have is small 

 compared with that, but some of the examples are of great 

 beauty. 



Although the Entomostraca occur so abundantly in the Chalk 

 generally, thty were not present in noticeable quantities in the 

 material now under consideration. Only three slides represent 

 this group. 



For the rest, that are unclassed, I may say, one slide seems to 

 exhibit a piece of mammilated chalcedony ; another, three 



