see Reshetnikov & Combes (1994) (RC).

Results and discussion
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NGC 3808B (PRC D-19)
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NGC 3808 (Arp 87, VV 300) is M 51-type interacting double system, which consists of Sc spiral with $B_{t}\rm\,=\,14.1\pm0.3$ (de Vaucouleurs et al. 1991, RC3) seen nearly face-on and a companion located at the end of spiral arm of the main galaxy and seen edge-on. In what follows we shall refer to the main galaxy as NGC 3808A and the companion as NGC 3808B. The distance to the system is $\rm D\,=\,$93 Mpc (RC) and the angular separation between companions is about 1.1’ (30 kpc). Our unpublished observations with 6-m telescope show that a radial velocity difference between two galaxies is only 33 km/s.

As one can see in Fig.1 where a contrast copy from the “Atlas of Peculiar Galaxies” (Arp 1966) is given, the spiral arm of the main galaxy is not only drawn out to the companion but twines it forming an unrolled spiral. For this reason Schweizer (1986) has supposed that in the case of NGC 3808B we observe the formation of polar ring as a result of mass transfer from the nearby galaxy. This suggestion is confirmed by spectral observations which 