Charley,
Thank you for your suggestion.

Do you have a citation for that information about Phryganea egg masses? Or do you know where I could find photos?

Thank you, Tom Pelletier

Well, the short answer is that I got the information from a book I wrote (1). Pages 6-9 cover freshwater egg masses with gelatinous coverings. Phryganea eggs are described but not illustrated; some other caddisfly eggs are illustrated through, as are some chironomid eggs and some snail eggs, including Lymnaea--I followed the link from your profile to your website and saw that someone else had identified the above eggs as such. If you check my book, you'll see that snail eggs tend to have a large, clear oval surrounding the little spherical embryo; also I've never seen snail eggs arranged in such a tight spiral as in this photo, whereas this is typical of caddisfly (and midge) eggs. Plus, although I can't make out the hatchlings very well, you said they have legs, which would rule out snails.

I have seen Phryganea eggs illustrated, but unfortunately I don't recall where... it was in one or more of the sources listed on pp. 536-7 or 540 of my book.