Hubble's Tuning Fork Diagram   (A Classification Scheme)

        N o r m a l   S p i r a l s  
        Sa (NGC1357) Sb (M81) Sc (NGC3184)  
       
Ellipticals         (Irregulars)
   
E0 (M87) E4 (NGC1339) E7 (NGC4342)

S0/SB0(NGC2787)

      SMC

Click here for an image of a peculiar galaxy (not irregular) which doesn't fit into Hubble's sequence.
Click here for another.
   
        SBa (NGC357) SBb(NGC1300) SBc(NGC1365)  
        B a r r e d   S p i r a l s