The structure on the human face that contains the nostrils and organs of smell and forms the beginning of the respiratory tract
A proboscis absent, but jaws usually present.
The proboscis bears at its extremity a circlet of smaller oral tentacles.
The stomach may be drawn out into the manubrium, forming a proboscis (" Magenstiel ") of considerable length.
Proboscis present, but short.
Shell turriculated and siphonated, thick, each whorl with varices; foot broad and truncated anteriorly; pallial siphon well developed; proboscis present.