BY INFERIOR ORGANISMS. 113 
ata, Lumbricus hirticauda, L. simplicissinus, Pla- 
naria retusa, Brachiurus quadruplex, and Spirogra- 
plhis Spallanzani. Some of these were found off the 
coast of Genoain 1805. Scoresby and Riville soon 
recognized other phosphorescent species, which 
they dredged from the ocean in their voyages. 
Macartney made known, in 1810, the luminous 
Medusa scintillans, M. lucida, and another curious 
little being closely allied to Meduse, called Beroe 
fulgens. Peron and Lesueur, in their voyage from 
Kurope to the Isle of France, discovered the Pyro- 
soma Atlantica (fig. 12: 1, the entire animal mag- 
nified; 2, the phosphorescent surface of the body, 
magnified 300 diameters), one of the most curious 
of animals. It belongs to the tribe of Tunicata ; 
each individual resembles a minute cylinder of 
glowing phosphorus; sometimes they are seen 
adhering together in such prodigious numbers, 
that the ocean appears as if covered with an enor- 
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