When Matt said "small," he wasn't kidding! Compare the Velella (of various sizes) with the surrounding sand grains:
Here's a picture with a ruler for a sense of scale. The largest Velella were only about 10 mm long:
There were thousands of Velella washed up on the beach today (9 March 2017). Here's one more picture of one of these beautiful little sailors:
P.S. I've posted about Velella quite a bit. If you're new to the blog and to Velella velella, the best place to start is probably the post from 5 December 2012. Otherwise, just visit the Natural History of Bodega Head website, scroll to the very bottom of the page, and enter "velella" under "Search This Blog" to find various posts about the biology and life history of Velella.