FORAMINIFERA. 



125 



expands very rapidly in its last half turn, the mouth running along 

 the length of the base, and being constituted by numerous isolated 



Fig. 29. — Types of Foraminifera. a, Cornuspira foliacca ; b, Qiiinqiteloculiua seminulum ; 

 c, Pe?ierof>lis pertusus ', d, Lituola agglutinans ; e, Trochammina pusilla] /, Lagena sulcata; 

 g, Nodosaria radictda ; h, Marginulina rapkanus ; i, Frondicularia Archiaciana ', j, Poly- 

 morphina lac tea; k, Globigcrina bulloides ; /, Textularia sagittiila ; m, Cassidulina leevigatd; 

 n, Bulimina Bitchiana; o, Rotalia Beccarii ; p, Truncatulina lobatula; r, Archcediscus Kar- 

 reri; s, Polystomella crispa; t, Amphistegina Lessoni. All the figures are greatly enlarged, 

 the real diameters varying from 1-100 to 1-10 inch. (H. B. Brady.) 



pores. It ranges from the Eocene to the present day. Much more 

 complicated types of the Miliolidce are Alveolina and Orbitolites. 



