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In 1878 I had the good fortune to find at Roscoff the material for the solution of the problem in the grass-green planarian, Convoluta schultzii, of which multitudes are to be found in certain localities on the coast, lying on the sand, covered only by an inch or two of water, and apparently basking in the sun.
Coelenteria, without anus and body-cavity. : 6. Gastraeades. With two germ-layers. : 6. Gastrula. Hydra, Olynthus, Gastremaria. 6 to 8. Coelenteria, without anus and body-cavity. : 7. Cryptocoela. Convoluta, Proporus. 6 to 8. Coelenteria, without anus and body-cavity. : 8. Rhabdocoela. Vortex, Monotus. 9 to 11. Vermalia, with anus and body-cavity. : 9. Provermalia. Gastrotricha.
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