. The depths of the sea; an account of the general results of the dredging cruises of SS. 'Porcupine' and 'Lightning' during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, J. Gwyn Jeffreys, and Dr. Wyville Thomson. Porcupine (Ship); Lightning (Ship); Ocean; Marine animals; Deep-sea temperature; Marine sediments. ciiAr. THE CRUISES OF THE 'PORCUPINE: 159 The spines are very delicate and hollow, with pro- jecting- processes arranged in an imperfect spiral; and resemble somewhat the small spines of the Diade- matidse. The colour of the test is a ric
. The depths of the sea; an account of the general results of the dredging cruises of SS. 'Porcupine' and 'Lightning' during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, J. Gwyn Jeffreys, and Dr. Wyville Thomson. Porcupine (Ship); Lightning (Ship); Ocean; Marine animals; Deep-sea temperature; Marine sediments. ciiAr. THE CRUISES OF THE 'PORCUPINE: 159 The spines are very delicate and hollow, with pro- jecting- processes arranged in an imperfect spiral; and resemble somewhat the small spines of the Diade- matidse. The colour of the test is a rich crimson with a dash of purple, and it is very permanent; the only perfect specimen procured which is preserved in spirit has not lost colour greatly to the present time. In the summer of 1870, Mr. Gwyn Jeffreys, dredging on the coast of Portugal, took two nearly perfect specimens and several frag- ments of another species of the genus Calveria; and subsequent careful examination of fragments and debris has shown that this second species, , occurs likewise in the deep water off the coast of Scotland and Ireland. The interambulacral plates are nar- rower, and leave larger membra- nous spaces between them, and tlie great key-like overlapping expan- sions in the middle line are much larger. The spines have the same form and are arranged nearly in the same way; but parallel to the outer row of large spines on each interambulacral space of four or five or more pedicellarige, of quite a peculiar type. The head of the ]3edicellaria, which is supported on a long stalk, consists of four valves (Eig. 29), the Avide terminal portion of each forming. o. 29.—CoZrecin fenes/nit(t, WvviLLE Thomson. One of the four-valved peclicellaricie. there is a row. 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 Thomson
Size: 900px × 2775px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectmar, booksubjectocean
