Yes, it's slugs. Here are a lot of things that you can do that don't involve spraying with Sevin. (Carbaryl is Sevin.)

Here is a link that might be useful: Snails and slugs management

Sevin is an insecticide and just in case you don't know, its use is very controversial. Slugs are not insects. ;) Check out Sluggo Slug and Snail Bait.

And if you haven't already done so, please be sure to read the label instructions, hazards, and warnings on the Sevin very carefully and use it only as recommended.

Dave

Get 'em drunk and dead on beer. Pour about an inch into some jar-tops and set them out in the garden. They'll drink and drown in it.

I see lots of slugs in those pictures, some on the ground, some on the leaves. Get busy!

Jim