Laube, and Etheridge, were described in the essay on the fossil Madreporaria, it is not necessary to refer to them again.
Nor do I refer to the New-Zealand strata which have yielded Echini, as they will probably form the subject of a future communication. I have, however, noticed all the species of Echini hitherto described; and I have carefully compared all the fossil species not only with their geological, but also with their recent representatives and allies.
In doing this it has been necessary to absorb some genera, and to consider some species as varieties; and this proceeding has been forced upon me principally by the insight I have obtained into the variability of the recent Echini. Alexander Agassiz has placed me under great obligations by the gift of his magnificent works on the revision of the Echini; and I have been able to determine some difficult points by the study of Lovén's 'Etudes sur les Echinoïdées,' and especially those relating to the Hemipatagi now included in the genus Lovenia.
II. List of Species of the Australian Cainozoic Deposits.
1. Leiocidaris australiæ, sp. nov. Cape Otway.
2. Psammechinus Woodsi, Laube. Murray Cliffs.
3. Paradoxcechinus novus, Laube. Murray Cliffs.
4. Temnechinus lineatus, sp. nov. Mordialloc.
5. Echinanthus testudinarius, Gray. Lindenow, Mitchell River.
6. Echinarachnius parma, Gray. Cape Otway, Cardies River.
7. Arachnoides Loveni, sp. nov. Mordialloc.
8. „ elongatus, sp. nov. Mount Gambier.
9. „ australis, Laube, sp. Murray Cliffs.
(Syn. Monostychia australis, Laube.)
10. Echinolampas ovulum, Laube. Murray Cliffs.
11. Rhynchopygus dysasteroides, sp. nov. Cape Otway.
12. Echinobrissus australiæ, sp. nov. Cape Otway.
13. Pygorhynchus Vassali, Wright. East of Glenelg River.
14. Catopygus elegans, Laube. Murray Cliffs.
15. Holaster australis, sp. nov. Cape Otway.
16. Maretia anomala, sp. nov. Mouth of Sherbrook River.
17. Eupatagus rotundus, sp. nov. Murray Tertiaries.
18. „ Laubei, sp. nov. Mouth of Sherbrook River.
19. „ murrayensis, Laube. Murray Cliffs.
20. „ Wrighti, Laube. Murray Cliffs.
21. Lovenia Forbesi, Woods and Duncan, sp. Mount Gambier,
Mordialloc, &c.
(Syn. Hemipatagus Forbesi, Woods and Duncan.)
„„ var. minor, nov. Mordialloc.
Lovenia Forbesi, var. Woodsi, Etheridge. Mordialloc.
(Syn. Hemipatagus Woodsi.)
22. Schizaster ventricosus, Gray. Adelaide.
23. Micraster brevistella, Laube. Banks of the Murray.
24. Megalaster compressa. Banks of the Murray.
