▁wh or ls ▁are ▁orn ament ed ▁with ▁longitud inal ▁fol ds ▁or ▁rib s , ▁narrow , ▁and ▁regular , ▁fin er ▁and ▁closer ▁towards ▁the ▁lip . ▁Upon ▁the ▁body ▁wh or l , ▁which ▁is ▁somewhat ▁vent ric ose , ▁the ▁rib s ▁are ▁slightly ▁ar cu ated ▁throughout ▁their ▁whole ▁length . ▁They ▁descend ▁quite ▁to ▁the ▁base , ▁and ▁towards ▁that ▁point ▁they ▁are ▁inter se cted ▁by ▁trans verse ▁st ria e . ▁Similar ▁st ria e ▁exist ▁at ▁the ▁upper ▁part ▁of ▁the ▁lowest ▁wh or l , ▁which ▁is ▁fl atten ed . ▁The ▁a pert ure ▁is ▁el ong ated , ▁and ▁dil ated ▁in ▁the ▁middle . ▁Its ▁interior ▁is ▁vio let ▁colored . ▁The ▁thick ▁outer ▁lip ▁is ▁stri ated ▁internally . ▁ ▁Distribution ▁The ▁species ▁occurs ▁in ▁the ▁Atlantic ▁Ocean ▁off ▁Gab on , ▁the ▁G ulf ▁of ▁Guinea ▁and ▁Ang ola ▁ ▁References ▁▁ ▁Bernard , ▁P . A . ▁( Ed .) ▁( 1 9 8 4 ). ▁Co qu ill ages ▁du ▁Gab on ▁[ Sh ells ▁of ▁Gab on ]. ▁Pierre ▁A . ▁Bernard : ▁Lib re ville , ▁Gab on . ▁ 1 4 0 , ▁ 7 5 ▁pl ates ▁pp . ▁▁ ▁G of as , ▁S .; ▁Af onso , ▁J . P .; ▁Brand à o , ▁M . ▁( Ed .). ▁( S . a .). ▁Con chas ▁e ▁Mol us cos ▁de ▁Ang ola ▁= ▁Co qu ill ages ▁et