CYPHODEUIA AMPULLA. 



79 



might be expected, is a specialized form of tlie sphag- 

 num- and moss-inhabiting variety. 



Whatever may be the size of the test it is at once 

 identified by an examination of its structure. No 



FiQ. 146. — Portion of test of Oyphoderia ampulla var. major, and 

 section of same, x 4000. 



FiGi. 147. — Portions of test of Oyphoderia ampulla var. major, x 4000. 

 a, from Port Erin, Isle of Man ; 6, another specimen from same 

 locality showing line of a fracture. 



other known species of Oyphoderia possesses the small 

 circular or oval " perforations " geometrically arranged 

 around the scales ; these " perforations " are in the 

 living animal filled up by a chitinous cement which is 

 dissolved out by cold sulphuric acid, the test itself 

 remaining unaffected. 



