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Updated: May 26, 2025
I attempted to pull him out of his lodging, and he was so firmly fastened to the interior by hooks on his belly that he held on until he was torn asunder. His abdomen is soft and pulpy and without protecting plates, as have other crabs, and he survived only by his childhood custom of stealing a univalve abode, though he murdered the honest tenant.
Pleurotomaria carinata, Sowerby. Mountain Limestone. Euomphalus pentangulatus, Sowerby. Mountain Limestone. a. Upper side. b. Lower or umbilical side. c. View showing mouth, which is less pentagonal in older individuals. d. Euomphalus is a characteristic univalve shell of this period.
It has been quarried to the depth of more than 40 feet, but its thickness is unknown. The imbedded shells are chiefly casts, many of them of univalve mollusca, which are usually very rare in the white chalk of Europe.
Bivalve and univalve mollusca seem to be rare at the greatest depths; but starfishes, sea urchins and other echinoderms, zoophytes, sponges, and protozoa abound. It is obvious that the Challenger has the privilege of opening a new chapter in the history of the living world. She cannot send down her dredges and her trawls into these virgin depths of the great ocean without bringing up a discovery.
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