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The primitive mouth is surrounded by a dark ring that bears very strong and long vibratory lashes, and effects the swimming movements. Pemmatodiscus and Kunstleria may be included in the family of the Gastremaria. The Dicyemida live parasitically in the body-cavity, especially the renal cavities, of the cuttle-fishes.
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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