8. VISION AND BIOLUMINESCENCE
233
D
FIo. 80. Sections of eyes of euphausiids. A, Nematoscelis microps; B, Euphausia sp.,
longitudinal section showing photophore ; C, horizontal section of Euphausia sp. :
D, longitudinal section of Stylocheiron suhmii ; bv, blood vessels ; ph, photophore.
(After Chun, 1896.)