. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. — SEA-URCHIN8. 97. Fig. '.'AY.). — Hemipedina cubensis. }. of proof that pedicellate 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 w
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. CHARACTERISTIC DEEP-SEA TYPES. — SEA-URCHIN8. 97. Fig. '.'AY.). — Hemipedina cubensis. }. of proof that pedicellate 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-fathom 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 oif 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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