Smithsonian Report, 1960 — Nico 



Plate 4 



1. A brightly luminous colonial sea squirt, Pyrosoma. The colony is made up of many 

 luminous individuals, inhabiting a common casing. Colonies reach a length in the 

 neiuhborhood of 500 cm. 





2. Li\ii.^ Liilc, v.i Noctiluca miliaris, a singlc-ccUcd animal that sometimes swarms in im- 

 mense numbers at the surface of the sea and produces bright luminous displays. It is 

 one of several creatures responsible for "phosphorescent" seas. Each organism or cell 

 is about 1 mm. in diameter. 



