You cannot help but notice the handsome, broad ribs going around the shell as well as the special feature of the grinning tun ​ — its thickened lip buttressed with teeth.
Muciņgliemeža čaulu apvij lielas, platas vītnes, un sevišķi iezīmīga ir šīs čaulas biezā lūpa, ko ieskauj mazi zobiņi.