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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.
His peculiarity is a white collar about the neck, so his Latin name, Ursus collaris, means the bear with a collar. All through the Himalayas, this restless plantigrade has wandered, and even far down upon the low-lying plains of India and China; but all the way he shuffles and shambles and is the same droll fellow. The bear's vegetable diet consists of berries, nuts and many kinds of roots.
Hence it is remarkable that four or five of the fossil shells from Navidad, namely, Voluta alta, Turritella Patagonica, Trochus collaris, Venus meridionalis, perhaps Natica solida, and perhaps the large oyster from Coquimbo, are considered by Mr. Sowerby as identical with species from Santa Cruz and P. Desire. M. d'Orbigny, however, admits the perfect identity only of the Trochus.
We will first take the case of Navidad, in latitude 34 degrees, where thirty-one species were collected, and which, as we shall presently see, must have inhabited shallow water, and therefore will necessarily well exhibit the effects of temperature. Including Coquimbo, we have Perna in the same predicament. The Trochus collaris, moreover, and, as we have just seen according to Mr.
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