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Its carapace is but slightly compressed laterally and hairy, as in Sacculina purpurea; the adherent feet are of considerable size, and the natatory feet are wanting, as, in the adult animal, are the corresponding cirri. As I learn from Mr. Powell in the Mauritius. Eggs of Tetraclita porosa in segmentation, magnified 90 diam.
Nauplius of Tetraclita porosa after the first moult, magnified 90 diam. The entire series of Nauplius-stages which are passed through by the free Copepoda, are in this case completely over-leapt. Some ascribe to them a very subordinate position among the Copepoda; as Milne-Edwards . In direct opposition to this notion of his father's, Alph.
To this Upper Devonian belong a series of limestones and slates well developed at Petherwyn, in Cornwall, where they have yielded 75 species of fossils. Heliolites porosa, Goldf. sp. Portion of the same magnified. Favosites cervicornis, Blainv. S. Devon, from a polished specimen. a. Cyathophyllum caespitosum, Goldf.; Plymouth and Ilfracombe. b. A terminal star. c.
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