the opening to the snail shell is known as the umbilicus.
the opening to the snail shell is known as the umbilicus.
the opening to the snail shell is known as the?
umbilicus
in some prosobranch gastropods, the aperture of the shell can be closed, and even completely sealed, with a sort of door or operculum.









































the aperture of many snail shells is more or less round, rounded, elliptical or oval. this shape usually corresponds roughly to the cross-section of the body whorl of the shell.









































the aperture of a snail shell can have many other forms: semicircular, trilobate or auriculate. in some gastropods, the aperture is narrowed by protruding plaits, which help make the soft parts of the animal less vulnerable to predation.
aperture (mollusc)
for the most complete information available on snail shell cave and the other caves that compose the snail shell cave system, you may wish to consult the book "snail shell cave" (august, 2012) by larry e. matthews and bob biddix. published by the national speleological society, this book is 241 pages long and contains numerous maps and photographs of the caves. ("snail shell cave", )









































section::::further reading.









































bullet::::- thomas c. barr, jr. (1961), "caves of tennessee", bulletin 61 of the tennessee division of geology. description, maps, and photographs of snail shell cave are on pages 407-412.
snail shell cave