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277 



(])1. 10. fig. 110) are pale glaucous blue. A larger group is found at the red end, 

 comprising G. postmandatum sp. nov. (pi. 6, fig. 64), G. coraUinum sp. nov. 

 (pi. 10. fig. 117), G. virgatnm sp. nov. (jjl. 10, fig. 112), G. hritannia nom. sp. 

 nov., G. cuneatiim sp. nov., G. capsuJatnm sp. nov. (pi. 5, fig. 54), G. rubricau- 

 datiim sp. nov. (pi. 10, fig. 116), and G. culetis sp. nov. (pi. 7, fig. 77), all exhib- 

 iting various tones of red and purple, in several cases in the form of pigment 

 with a greenish yellow color in the cj'toplasm, as in G. eoralliiuim sp. nov. and 

 G. virgatum sp. nov. 



Fig. EE. Gyrodinium. 1 and 2. G. fonroi/ncMm (Lebour). After Lebour (19176, figs. 11a, 6). 3. G. fucorum 

 (Kiister). After Kiister (1908, fig. 1). 4. G. fusiforme nom. sp. nov. After Mcunier (1910, pi. 14, fig. 25). 

 5. G. mitra (Schiitt). After Schutt (1895, pi. 21, fig. 68a,). 6. G. lachryma (Meunier). After Meunier (1910, 

 pi. 14, fig, 21). 7. G. ovatum (Gourret). After Gourret (1883, pi. 1, fig. 22); magnification? 8. G. fusiforme 

 nom. sp. nov. After Meunier (1910, pi. 14, fig. 23). 9. G. cornittum (Pouchet). After Pouchet (1885a, pi. 4, 

 fig. 31). X 500. 



Of the remaining thirty-seven species ten have been described without 

 reference to their color and the others fall Avithin the green-yellow part of the 

 spectriun, varying from the mixed yellow green of G. fissmn (Levander) (pi. 9, 

 fig. 95) and G. ohtnsum nom. s]x nov. to the green of G. herbaceum sp. nov. 

 (pi. 10, fig. 109), on the one hand, and on the other the yellow of G. caudatiim 

 sp. nov. to the deep yellow ochre of G. ocJiraceum sp. nov. (pi. 7, fig. 76). In 

 the green and yellow group the latter color predominates, sixteen species exhib- 

 iting various shades of yellow and yellow ochre and seven exliiliiting a green 

 color with three of intermediate tones. One species only, G. spiunantia sp. nov. 

 (pi. 7, fig. 72), shows the presence of melanin. 



GyrocUnium sliows a distinct advance over the genus Gymnodinium in that 

 the number of species possessing chromato])hores has been reduced and the 

 number of those possessing colored pigment has lieen increased. As in that 

 genus, so also in Gyrodiniuiit the latter group is composed of those species whose 



