. A contribution to American thalassography : Three cruises of the United States Coast and geodetic survey steamer "Blake", in the gulf of Mexico, in the Caribbean sea, and along the Atlantic coast of the United States, from 1877 to 1880. Blake (Steamer); Marine animals -- Atlantic Ocean; Marine sediments. 114 THREE CRUISES OF THE BLAKE. Like other marine animals, ophiurans are distributed accord- ing to the depth and temperature of the water. About one half of the known species are confined to the zone between low-water mark and 30 fathoms. These include the Medusa-heads (Astro- phy
. A contribution to American thalassography : Three cruises of the United States Coast and geodetic survey steamer "Blake", in the gulf of Mexico, in the Caribbean sea, and along the Atlantic coast of the United States, from 1877 to 1880. Blake (Steamer); Marine animals -- Atlantic Ocean; Marine sediments. 114 THREE CRUISES OF THE BLAKE. Like other marine animals, ophiurans are distributed accord- ing to the depth and temperature of the water. About one half of the known species are confined to the zone between low-water mark and 30 fathoms. These include the Medusa-heads (Astro- phyton). But not less than one tenth of the known living forms are found entirely below 1,000 fathoms, and of these sev- eral, such as Ophiomusium Lymani? Ophiocreas spinulosus, and Ophiocamax hystrix, live in great colonies, just as some of the. Fig. 399. — SigsLeia murrhina. shallow-water species do. They are found in various situations. The localization of some of these is very marked. The stiff- armed Ophiomusium of deep water, with their swollen tubercu- lous plates, naturally lie on the bottom, while other species with supple or prehensile arms, such as Sigsbeia (Fig. 399) and As- 1 All the way from Cape Hatteras to the extremity of George's Bank, Ophiomu- sium Lymani was quite common in deep Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agassiz, Alexander, 1835-1910; U. S. Coast and Geodetic Survey. Boston ; New York : Houghton, Mifflin and Co.
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