Note 3 — Chapter I · STARS OF THE SEA.
Reading edition
Page 9. Giglioli and his assistant, De Fillipi, observed luminosity in the gelatinous mass described by Hækel as Citophora.
The genera of those low forms most remarkable for luminosity are Thalassicolla, Collozoum, Sphærozoum, and Collosphæra. Giglioli states that the forms of this group which are found in the Indian Ocean and China seas are not luminous.