[90] Mr. E. T. Browne, of the Zoological Laboratory of University College, London, has kindly furnished me with the following notes on this subject: "Jonston (1657) gives figures of Anemones and large _Medusae_ under the name of _Urtica_. On Tab. xviii. he figures Anemones and other beasts, but not _medusae_. The _medusae_ are on the next Tab. (xix.). _Urtica marina_ includes both Anemones and certain Scyphomedusae (not _Pulmo_). Under 'some ... called Squalders of a burning and stinging quality,' I think Browne must refer to our common stinging Scyphomedusae belonging to the genus _Chrysaora_ or _Cyanaea_, of which there are three species. "The vague description of what he calls 'sea buttons' [see below, also second letter to Merrett] would suit either a Medusa or a Ctenophore. The additional note, 'two small holes in the ends,' rather upsets matters, but I think he must refer to some sort of jelly-fish, probably damaged, which is usually the case when cast up on the shore. If the buttons worn in those days were like filbert-nuts or eggs, I am inclined to think that the reference must be to a Ctenophore, genus _Pleurobrachia_, but if flat, then to one of the _Hydromedusae_. It would be safe to say, 'probably a kind of jelly-fish,' which is about as vague as the reference." See also Dr. Reuben Robinson's description of "Squalders" in a letter to Browne (Wilkin i., pp. 422-424). It seems probable that the gelatinous masses referred to in the early part of this letter, which Dr. Robinson says were ascribed by Dr. Charleton to "the nocturnall pollution of some plethorick or wanton starr: or rather excrement blowne from the nosthrills of a rheumatick planett," were the remains of the undeveloped spawn of frogs, the bodies of which had been eaten by rats, crows, or herons, and which had become swollen by exposure to moisture. [The next paragraph on folio 33 _verso_ is evidently added subsequently.] Another elegant sort that is often found cast up by shoare in great numbers about ye bignesse of a button cleere & welted & may bee called fibula marina crystallina. hirudines marini or sea Leaches.[91]