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Pectunculus lividus, Reeve. 73. Pectunculus pectenoides, Deshayes. 74. Avicula margaritifera, Linne. 75. Tridacna gigas, Linne. On the day of our arrival at El-Wijh I sent a hurried letter of invitation to Mohammed 'Afnan, Shaykh of the Baliyy tribe; inviting him to visit the Expedition, and to bring with him seventy camels and dromedaries.
Unfortunately they are very sensitive, especially to wet weather. Oenothera gigas and O. rubrinervis, or the giant, and the red-veined evening-primroses, are the names given to two robust and stout species, which seem to be equal in vigor to the parent-plant, while diverging from it in striking characters.
The animal of northern Europe and Asia is usually considered to be distinct from the American, and lately the Alaskan moose has been christened Alces gigas, marked by greater size, relatively more massive skull, and huge antlers. Of the antecedents of Alces, as in the case of the reindeer, we are ignorant.
Or is it perhaps concealed among the throng, being distinguished by no peculiar character? If our gigas and rubrinervis were growing in equal numbers with the lamarckiana in the native field, would it be possible to decide which of them was the progenitor of the others?
" crispa × " " " Dowiana × " " " Schofieldiana × " gigas imperialis. " Leopoldii × " Dowiana. Cypripedium Stonei × Cypripedium Godefroyæ. " " × " Spicerianum. " Sanderianum × " Veitchii. " Spicerianum × " Sanderianum. " Io × " vexillarium. Dendrobium nobile nobilus × Dendrobium Falconerii. " " × " nobile Cooksonianum. " Wardianum × " aureum. " " × " Linawianum. " luteolum × " nobile nobilius.
Two or three of these, as Calamites gigas, Sphenopteris erosa, and S. lobata, are also met with in the government of Perm in Russia. Cardiocarpon Ottonis. Neoggerathia cuneifolia. Brongniart. Coniferae, of the Araucarian division, also occur; but these are likewise met with both in older and newer rocks.
Briefly considering the different forms, we may state that the full experimental proof has been given for the origin of gigas and rubrinervis, for albida and oblonga, and even for nanella, which is to be considered as of a varietal nature; with lata the decisive experiment is excluded by its unisexuality. laevifolia and brevistylis were found originally in the field, and never appeared in my cultures.
It has been attempted to compute, but I believe erroneously, the rate of growth of a reef, from the fact mentioned by Captain Beechey, of the Chama gigas being embedded in coral-rock. But it should be remembered, that some species of this genus invariably live, both whilst young and old, in cavities, which the animal has the power of enlarging with its growth.
This is especially evident in the case of lata and nanella, which appeared in the first year of the pedigree culture and which since have been repeated yearly, and have been seen to arise by mutation also during the last season . Only gigas appeared but once, but then there is every reason to assume that in larger sowings or by a prolongation of the experiments it might have made a second appearance.
What he wanted was a vessel or a receptacle of some description in which he could heat the soup and make it somewhat more palatable; and here he remembered having passed during his morning's ramble on the beach a very large shell of the species Tridacna gigas.
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