. 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 1800. Blake (Ship); Marine animals -- Atlantic Ocean; Marine sediments; Ocean. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCHINS. 89 acters derived from the study of a limited number of specimens, both in the fossil and recent species. In the seas of the Jura. Fig-. 348. — Dorocidaris papillata. and of the chalk the Cidaridse must have been common types of sea-ur
. 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 1800. Blake (Ship); Marine animals -- Atlantic Ocean; Marine sediments; Ocean. CHARACTERISTIC DEEP-SEA TYPES. SEA-URCHINS. 89 acters derived from the study of a limited number of specimens, both in the fossil and recent species. In the seas of the Jura. Fig-. 348. — Dorocidaris papillata. and of the chalk the Cidaridse must have been common types of sea-urchins. Dorocidfiris Blakei (Fig. 349), obtained by the "Blake," is perhaps the most interesting of the recent Cida- ridse, from the variability of its spines. Before the " Blake " dredgings none were known among the recent species showing any great or striking variety in the form of the radioles. With the exception of some of the species of the genus Goniocidaris, the radioles are characterized by their uniformity, while among the fossils of the family the variation in shape and size of some of the Jurassic and cretaceous species is quite remarkable. If the present species had been dredged without its two or three. 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 Houghton, Mifflin
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectocean, bookyear1888
