148 THE FOEAMINIFEEA 



Genus TJiurammiiia, Beady. 



Test usually nionothalamous, inflated or com- 

 pressed, with apertures situated at the summits of 

 surface mammillae. Jurassic to Becent. 



Example. — T. i^apiUata, Brady, ' Quart. Journ. 

 Micr. Sci.' vol. xix. N.S. 1879, p. 45, pi. v. figs. 

 4-8. 



The variability sho^Yn in this species is very 

 great, the characteristic papillte being in some speci- 

 mens few, in others very numerous, and imparting 

 quite a rugose appearance to the test. The interior 

 is sometimes occupied by another globular chamber, 

 after the manner of Ofh/iliva, with which form it 

 presents some points of isomorphism. It is a deep or 

 moderately deep water species. The geological range 

 of T. lici'inlldtci. commences with the Jurassic beds of 

 Switzerland, in which they w^ere discovered by 

 Haeusler. Jurassic to Becent, (Plate 8, fig. A.) 



The sub-genus Tliurammiunpsis was established 

 by Haeusler for certain types of Jurassic Foraminifera 

 allied to the above genus, but which are much more 

 irregular in growth and consist of a multiple series 

 of chambers, on the internal walls of which a system 

 of tube-like ridges are apparent. The external sur- 

 faces of the test are papillate, especially at the 

 irregular outgrowths, after the manner of the typical 

 Thuraminina. Tliu ra mm inopsis caualicu lata was de- 

 scribed by Haeusler from the sponge beds of the 

 Jurassic ' Transversarius ' zone of Aargau, Switzer- 

 land (' Neues Jahrbuch,' 1883, vol. ii. p. 69, pi. iv.) 



