Into this abstract question, of course, I cannot enter. The reader who would wish to know more of the subject than I have faintly shadowed forth in this chapter, may consult Steenstrup's Memoir, published by the Ray Society; Dr. Reid's admirable papers in the 'Magazine of Natural History' 2d series; Lewes' 'Sea-Side Studies;' and the learned works of Professor Owen.
MEDUSÆ IN VARIOUS STAGES OF DEVELOPMENT.
[CHAPTER XIV.]
Doris, Eolis, &c.
'The inhabitants of the watery element were made for wise men to contemplate
and fools to pass by without consideration.'—Isaak Walton.