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Dichelaspis Darwinii was found by Filippi in the branchial cavity of Palinurus vulgaris, and I have met with another species of the same genus in the branchial cavity of Lupea diacantha. The same thing may have taken place in primitive times.
Musters, Captain, on Rhea Darwinii; marriages amongst Patagonians. Mutilations, healing of; inheritance of. Mutilla europaea, stridulation of. Mutillidae, absence of ocelli in female. Mycetes caraya, polygamous; vocal organs of; beard of; sexual differences of colour in; voice of. Mycetes seniculus, sexual differences of colour in. Myriapoda.
Terebratula aenigma, var. Spirifer Chilensis. Mingled together in alternating beds in the main valley of Copiapo near Las Amolanas, and likewise higher up the valley: Pecten Dufreynoyi. Turritella Andii. Terebratula aenigma, var. as at Guasco. Astarte Darwinii. Gryphaea Darwinii. Gryphaea nov. species? Perna Americana. Avicula, nov. species. Pecten Dufreynoyi. Gryphaea Darwinii?
These might be called the organs of courtship, such as the peacock's tail, the plumes of the birds-of-paradise, and the brilliant plumage of humming birds and many others. The song of birds is another example, and sound is produced in many Fishes for a similar purpose. In the South American species, Rhinoderma darwinii, the enlarged vocal sacs are used for this purpose.
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.
They are greenish-yellow inside, but of a dark brownish-crimson without, while the leaves are small and round, and die off crimson in autumn. B. STENOPHYLLA, a hybrid between B. Darwinii and B. empetrifolia, is one of the handsomest forms in cultivation, the wealth of golden-yellow flowers being remarkable, as is also the dark purple berries. It is very hardy, and of the freest growth.
In conclusion I may observe that the Struthio rhea inhabits the country of La Plata as far as a little south of the Rio Negro in latitude 41 degrees, and that the Struthio Darwinii takes its place in Southern Patagonia; the part about the Rio Negro being neutral territory. M. A. d'Orbigny, when at the Rio Negro, made great exertions to procure this bird, but never had the good fortune to succeed.
Close to the junction between this upper black slate-rock and the upper red sandstone, I found the Gryphaea Darwinii, the Turritella Andii, and vast numbers of a bivalve, too imperfect to be recognised.
Oranges, treatment of, by monkeys. Orange-tip butterfly. Orchestia Darwinii, dimorphism of males of. Orchestia Tucuratinga, limbs of. Ordeal, trial by. Oreas canna, colours of. Oreas Derbianus, colours of. Organs, prehensile; utilised for new purposes. Organic scale, von Baer's definition of progress in. Orioles, nidification of. Oriolus, species of, breeding in immature plumage.
I found here a species of cactus, described by Professor Henslow, under the name of Opuntia Darwinii "Magazine of Zoology and Botany" volume 1 page 466, which was remarkable for the irritability of the stamens, when I inserted either a piece of stick or the end of my finger in the flower. The segments of the perianth also closed on the pistil, but more slowly than the stamens.
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