The Ctenophores were the first forms in which the inhibiting effect of light was noticed.
"The Nature of Animal Light" by E. Newton Harvey
Why are ctenophores more easily seen in the night than other coelenterates are?
"A Guide for the Study of Animals" by Worrallo Whitney
When hatched, the little Ctenophore is already quite advanced.
"Seaside Studies in Natural History" by Elizabeth Cabot Cary Agassiz
The representatives of the Ctenophores, most often seen on our own coasts, are small rounded forms.
"Stories of the Universe: Animal Life" by B. Lindsay