84 MICROSCOPICAL OBJECTS FOUND 



above Beyrout. Nature has here gone a step 

 beyond what she has accomplished in the Irish 

 Chalk, and obliterated not only the fragments, 

 but the perfect Polythalamia, with the exception 

 of a few scattered translucent points, which may 

 be the faint remaining indications of the once 

 organic condition of the whole mass. 



The Blue Clay of Speeton, the Yorkshire 

 representative of the Neacomian series, abounds 

 in Polythalamia. From one specimen, not more 

 than 1 g cubic inches in bulk, I obtained examples 

 of at least five species, consisting of two specimens 

 of a small Nodosaria, two of a Marginulina, two of 

 an Oolina, or same genus identical with fig. 71, 

 about forty specimens of a beautiful little Cristella- 

 ria, and above one hundred of a curious form of which 

 I have not yet identified the genus. These, along 

 with a few Entomostraca, and small fragments of 

 shell structures, constituted the only calcareous 

 elements of the stratum. I was much interested 

 in receiving from Mr. Harris a Marginulina and 

 a Cristellaria which he had found in the Gault 

 of Folkstone, both of them identical with ray 

 Yorkshire species, as well as a third beautiful 

 form which was new to me. 



