I  recently returned from the Philippines. Diving around Mactan Is. I
collected
several specimens Bursa leo and Bursa tuberosissima. A couple of the
specimens have characteristics of both species. i.e. aperture bright yellow
with typical
dentation of tuberoissima but with the color and body whorl of  Bursa leo.
The two odd specimens lack the destintive hump on the dorsum as well. Does
anyone out there know if these species intergrade or if this is common?