. 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. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCHINS. 97. Fig. olio. — Hemipedina cubensis. }. of proof that pedicellariae are merely modified spines. The only other striking genus among the regular urchins is that of Hemi- pedina (Fig. 363), the modern repre- sentative of a family once grea


. 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. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCHINS. 97. Fig. olio. — Hemipedina cubensis. }. of proof that pedicellariae are merely modified spines. The only other striking genus among the regular urchins is that of Hemi- pedina (Fig. 363), the modern repre- sentative of a family once greatly de- veloped in the cretaceous period. Although the line to the eastward of Charleston, S. C., was commenced off the very home of the Scutelke and other clypeastroids, it is remarkable that not a single Mellita or Clypeaster was dredged either on that line or the line run in the axis of the Gulf Stream as far as Cape Hatteras. We had a similar experience while dredging near the 100-fathoni line when approaching the South American continent. The clypeastroids are evidently shallow- water types, with the exception of Echinocyamus, which extends into deep water (805 fathoms), and Echinarachnius, living speci- mens of which have come up in the trawl from a depth of 524 fathoms off George's Bank. An immense number of dead tests of Echinocyamus pusillus were dredged in the Caribbean, the Gulf of Mexico, and the Straits of .The Nucleolidse, to which Neolampas (Fig. 364), Rhyncho- pygus (Fig. 365), and Conolampas belong, are but scantily rep-. 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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Keywords: ., bookauthoruscoasta, bookcentury1800, bookdecade1880, bookyear1888