I found this milk snail, Otala lactea, while on a walk with Iggy, our chihuahua roommate. These snails are actually pretty easy to spot around our apartment complex, but I wasn’t sure exactly what kind of snail they were until I posted one on iNaturalist. With the help of an iNaturalist member and a picture of the front and underside of the snail, I was able to properly identify it. This snail is native to the Eastern Mediterranean and North Africa areas but it can also be found in southern US in humid climates and in California it is considered a serious pest, as it displaces native snails.
Milk snails are terrestrial, air-breathing snails. They feed on fruit and plants and are active at night. Their shells vary in color but are usually light brown with dark brown spiraling lines and patterns of stripes and dots. You can distinguish it by a highly extended apertural rim. The lip of its aperture is dark brown, almost black colored.
Since these snails are invasive in the US, one article suggests harvesting these edible snails so chefs could try to incorporate them into their menus. This will help to promote the populations of native snails.
My iNaturalist post can be found here.
Sources:
http://www.tsusinvasives.org/home/database/otala-lactea
http://www.molluscs.at/gastropoda/terrestrial.html?/gastropoda/terrestrial/otala.html