22 SlDEBOTTOM, Fora7ui?iiyeni // ofH the Bay of Palermo. 

 POLYMORPHININ/E. 



Polymorphina, d'Orbigny. 



PolyviorpJiina lactea, Walker and Jacob, sp. 



Polymorphina amygdaloides, Reuss. 



The specimens on the slide are very good examples 

 of this compressed form. 



Polymorphina lactea (W. and J.), var. oblonga, Williamson. 



One or two specimens occur, but they are not quite 

 typical. 



Polymorphina gibba, d'Orbigny. 



Polymorphina communis, d'Orbigny. 

 Two examples only. 



Polymorphina compressa, d'Orbigny. 



Large examples ; fistulose forms also. 



PolymorpJiina lactea, var. concava, Williamson. 

 A few small examples occur. 



Polymorpliina sorroria, Reuss. 



The tests are not quite typical. Some are round 

 at the base, approaching P. gutta, and others slightly 

 pointed ; all are small. 



Polymorphina spinosa, d'Orbigny, sp. 



See Delos paper (1907) for an account of these. 



Polymorphina complexa, Sidebottom. 



There are ten tests of this protean species on the 

 slide. They none of them correspond with the Delos 

 examples, but the aperture and colour are the same. 



Full particulars are given on page 16 in the Delos 

 paper (1907). 



PolymorpJiina, sp. 



There are a few large masses of Polymorphina, which 

 are, no doubt, monstrosities. 



