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CHAP. VI.
PALÆOZOIC STRATA.
173
| Zoophyta — | Polyparia | 41 |
| Crinoidea | 40 | |
| Echinida | 3 |
| Fig. | 1. Syringopora ramulosa. Goldfuss. |
| 2. Cyathophyllum (or Lithostrotion) basaltiforme. Phillips. | |
| 3. Actinocrinus triaconta dactylus. Miller. | |
| 4. Platycrinus laevis. ? Miller. |
The molluscous reliquiæ are numerous; 326 species being described in the 'Geology of Yorkshire,' without noticing about a dozen others from the coal formation, which are included in the following general summary:
| Mollusca — | Conchifera | plagimyona | 40 |
| mesomyona | 28 | ||
| brachiopoda | 100 | ||
| Gasteropoda | 92 | ||
| Cephalopoda | monothalamia | 10 | |
| polythalamia | 69 | ||
| —— | |||
| 309 |
Of these, only about 10 can by any means be considered as of freshwater, or even estuary, origin: and these all belong to the coal formation (unio, anodon, &c.). Many of the genera are the same as those now
