THE PERIDINIALES OF PLYMOUTH SOUND. 1&9 
(42) G. viridis n. sp. (Fig. 4). Closely related to the last species is 
one also found only singly and which is less than half the size. 
In shape it is much like G. pseudonoctiluca with a cap-like anterior 
Fia. 3.—Gymnodinium pseudonoctiluca Pouchet. 466. 
a side view, b ventral view. N=nucleus. C=chromatophores. 
OPMec0csvYZ 
S 
Ez 
Se, 
Fic. 4.—Gymnodinium viridis n. sp. x 466 
a side view, b ventral view. C=chromatophores. 
end; the longitudinal groove, however, reaches back slightly o ver 
the dorsal surface posteriorly so that the hind end is divided. 
The chromatophores are of a greenish yellow colour, not bright 
yellow as in P. pseudonoctiluca. Length 0.06 mm. Occurred 
once in June. 
