| Arp | SPIRAL GALAXIES: | Examples | 
      
        | 1-6 | Low surface brightness | NGC 2537 | 
      
        | 7-12 | Split arm | NGC 2523 | 
      
        | 13-18 | Detached segments | NGC 4088, NGC 7314 | 
      
        | 19-21 | Three-armed | NGC 145 | 
      
        | 22-24 | One-armed | NGC 4027, NGC 4618 | 
      
        | 25-30 | One heavy arm | M101, NGC 6946 | 
      
        | 31-36 | Integral sign | NGC 4615 | 
      
        |  | SPIRALS WITH COMPANIONS ON ARMS: |  | 
      
        | 37-48 | Low surface brightness companions | M77, NGC 1232 | 
      
        | 49-78 | Small, high surface brightness companions | M90, NGC 1097 | 
      
        | 79-91 | Large, high surface brightness companions | M51, NGC 5395 | 
      
        | 92-101 | Elliptical companions | NGC 3227, Hickson 93 | 
      
        |  | ELLIPTICAL GALAXIES: |  | 
      
        | 102-108 | Connected to spirals | NGC 5218 | 
      
        | 109-112 | Repelling spiral arms | NGC 7805 | 
      
        | 113-132 | Close to & perturbing spirals | M60, NGC 2300 | 
      
        | 133-136 | With nearby fragments | M49, NGC 1023 | 
      
        | 137-145 | Material emanating from E galaxies | NGC 275, NGC 2444 | 
      
        |  | GALAXIES: |  | 
      
        | 146-148 | With associated rings | IC 298 | 
      
        | 149-152 | With jets | M87 | 
      
        | 153-160 | Disturbed with Interior Absorption | NGC 5128, NGC 520 | 
      
        | 161-166 | With diffuse filaments | NGC 3414, NGC 750 | 
      
        | 167-172 | Diffuse counter-tails | NGC 2672, NGC 5718 | 
      
        | 173-178 | Narrow counter-tails | NGC 5613, NGC 4933 | 
      
        | 179-193 | Narrow filaments | NGC 4651, NGC 6217 | 
      
        | 194-208 | Material ejected from nucleus | NGC 3432, NGC 5544 | 
      
        | 209-214 | Irregularities, absorption & resolution | NGC 1569, NGC 7625 | 
      
        | 215-220 | Adjacent loops | NGC 2782, NGC 3310 | 
      
        | 221-226 | Amorphous spiral arms | NGC 2655, NGC 7727 | 
      
        | 227-231 | Concentric rings | NGC 474, NGC 508 | 
      
        | 232-256 | Appearance of Fission | NGC 4038, NGC 4676 | 
      
        | 257-268 | Irregular clumps | NGC 3239, NGC 4861 | 
      
        |  | DOUBLE GALAXIES: |  | 
      
        | 269-274 | Connected arms | NGC 4490, NGC 3395 | 
      
        | 275-280 | Interacting | NGC 3769, NGC 1253 | 
      
        | 281-286 | Infall & attraction | NGC 4631, NGC 5566 | 
      
        | 287-292 | Wind effects | NGC 3981, IC 195 | 
      
        | 294-297 | Long filaments | NGC 3786, NGC 3690 | 
      
        | 311-321 | Groups of galaxies | M66, Hickson 44 | 
      
        | 322-332 | Chains of galaxies | Hickson 55, Hickson 56 |