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In this species are comprehended three Ascidiæ, of different forms; one Anomia, one Terebratula attached to a Fusus, two Lepas, and a Balanus. Six Holothuria, belonging to three different species, were observed: a large Thalassema gave us a long-wished for opportunity of observing, that this species belongs to the Holothuria, and not to the Annulides.
Here are several species of the genera Murex, Fusus, Buccinum, Mitra, Trochus, and Turbo. Further, there are found here a large Fissurella, and six species of a genus which, from its simple, unwound shell, would be immediately taken for a Patella; the creature, however, closely resembles the Fissurella, with the difference that only one gill is visible in the fissure over the neck.
The sandstone contains fragments of wood, either in the state of lignite or partially silicified, sharks' teeth, and shells in great abundance, both high up and low down the sea-cliffs. Pectunculus and Oliva were most numerous in individuals, and next to them Turritella and Fusus. Gastridium cepa, G.B. Sowerby. 2. Monoceros, fragments of, considered by M. d'Orbigny as a new species. 3.
At the distance of a few yards, and in the same position, but a foot or two deeper, were observed marine shells, Cyprina islandica, Astarte elliptica, A. compressa, Fusus antiquus, Littorina littorea, and a Balanus. The height above the level of the sea was between 100 and 103 feet.
Cardita Patagonica, G.B. Sowerby. 7. Mactra rugata, G.B. Sowerby. 8. Mactra Darwinii, G.B. Sowerby. 9. Trigonocelia insolita, G.B. Sowerby. 11. Crepidula gregaria, G.B. Sowerby. 13. Voluta alta, G.B. Sowerby. 14. Trochus collaris, G.B. Sowerby. 15. Imperfect fragments of the genera Byssoarca, Artemis, and Fusus.
Speaking of the Wexford drift, the late Professor E. Forbes states that Sir H. James found in it, together with many of the usual glacial shells, several species which are characteristic of the Crag; among others the reversed variety of Fusus antiquus, called F. contrarius, and the extinct species Nucula Cobboldiae, and Turritella incrassata.
Scalaria was found at Valparaiso; Arca, at Iquique, in latitude 20, by Mr. Column 2. Latitudes, in which found fossil on the coasts of Chile and Peru. Column 3. Southernmost latitude, in which found living on the west coast of South America. Bulla : 30 to 43 30 : 12 near Lima. Cassis : 34 : 1 37. Fusus : 30 and 43 30 : 23 Mexillones; reappears at the St. of Magellan.
Yet the northern character of the Norwich Crag is not fully shown by simply saying that it contains twelve northern species. It is the predominance of certain genera and species, such as Tellina calcarea, Astarte borealis, Scalaria groenlandica, and Fusus carinatus, which satisfies the mind of a conchologist as to the arctic character of the Norwich Crag.
Fusus, very imperfect, somewhat resembling F. subreflexus of Navidad, but probably different. 3. Venus, fragments of. Sailing northward from Valdivia, the coast-cliffs are seen, first to assume near the R. Tolten, and thence for 150 miles northward, to be continued with the same mineralogical characters, immediately to be described at Concepcion.
Fusus difficilis, d'Orbigny, "Voyage, Part Pal." 5. Pyrula longirostra, d'Orbigny, "Voyage, Part Pal." 6. Pleurotoma Araucana, d'Orbigny, "Voyage, Part Pal." 7. Cardium auca, d'Orbigny, "Voyage, Part Pal." 8. Cardium acuticostatum, d'Orbigny, "Voyage, Part Pal." 9. Venus auca, d'Orbigny, "Voyage, Part Pal." 10. Mactra cecileana, d'Orbigny, "Voyage, Part Pal." 11.
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