2 adjectives to describe cockleshells

I must record also the disappearance of that tiny bronze cockleshell, outward bound for "Far Ports," from the Bonnie Lassie's window, though Mr. Hines was wrong in his theory that it could be boughtlike all else "at a price."

"Women and children first," the order long enforced among all decent men who use the sea, was the word passed from man to man as the boats were filled, the boatfalls rattled, and the frail little cockleshells were lowered into the calm sea.

2 adjectives to describe  cockleshells