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Littorina pyramidalis and mauritiana are inhabitants of the rocky headlands of Broken Bay; other forms were collected at Port Curtis and at Port Dalrymple. At the last-named locality, Turbo undulatus, a new Risella, Monodonta constricta and buccata, and Trochus reticularis were taken on reefs. Littoral species of the same genera occurred on the north-east coast.
Murchison and De Verneuil discovered this species dispersed in myriads through a white limestone of Upper Silurian age, on the banks of the Is, on the eastern flank of the Urals in Russia, and a similar species is frequent in Sweden. Lingula Lewisii, J. Sowb. Atrypa reticularis, Linn. Upper valve. b. Lower valve. c.
This is by no means a rare fossil in the slaty limestone of South Devon, and, like the Eifel form, is confined to the middle group of this country. Spirifera mucronata, Hall. Among the 18 species of all classes enumerated by Mr. Etheridge, two-thirds are common to the Middle Devonian, but only one, the ubiquitous Atrypa reticularis, can with certainty be identified with Silurian species.
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