. 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. WORMS. 53 extend from the littoral region as far as the greatest depth here recorded, one species having indeed been brought up in a Dentalium shell from a depth of 1,568 fathoms. Although so numerous, no new forms of these groups were collected eithe
. 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. WORMS. 53 extend from the littoral region as far as the greatest depth here recorded, one species having indeed been brought up in a Dentalium shell from a depth of 1,568 fathoms. Although so numerous, no new forms of these groups were collected either by the " Challenger" or " Blake," with the exception, perhaps, of some of the tubicolous types in deep water. Fur- thermore, these groups have but a slight significance as com- pared with the chsetopods of the collection. The existence of chaBtopods in certain localities where the animals themselves are not found may be inferred by the presence of their tubes. Like the littoral species of MaldanidaB, Clymense, Serpulas, and their allies, they must cover extensive tracts of ground with their tubes. Yet such- a conclusion is not always admissible without further evidence ; it can be accepted only when the indi- vidual worm builds his tube in so characteristic a way that there is no possibility of mistaking it for that of other annelids. Sev- eral tunes tubes which from their whole appearance have been taken for worm-cases were discovered to be inhabited by crusta- ceans (Amphipoda). We cannot always decide if the occupant of the tube was also its When no foreign material is used in the construction of the tube except mud consolidated by the secretions of the worm, the tubes of very different spe-. 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.
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Keywords: ., bookauthoruscoasta, bookcentury1800, bookdecade1880, bookyear1888
