  The "evolved main-sequence" channel is thought to contribute significantly to
the population of AM CVn type systems in the Galaxy, and also to the number of
cataclysmic variables detected below the period minimum for hydrogen rich
systems. CSS120422:J111127+571239 was discovered by the Catalina Sky Survey in
April 2012. Its period was found to be 56 minutes, well below the minimum, and
the optical spectrum is clearly depleted in hydrogen relative to helium, but
still has two orders of magnitude more hydrogen than AM CVn stars. Doppler
tomography of the H$\alpha$ line hinted at a spiral structure existing in the
disk. Here we present spectroscopy of CSS120422:J111127+571239 using the COS
FUV instrument on the Hubble Space Telescope and using the MODS spectrograph on
the Large Binocular Telescope. The UV spectrum shows SiIV, NV and HeII, but no
detectable CIV. The anomalous nitrogen/carbon ratio is seen in a small number
of other CVs and confirms a unique binary evolution. We also present and
compare the optical spectrum of V418 Ser and advocate that it is also an
evolved main-sequence system.
