In each line of progression in the Terebratellidae, the acceleration of the period of reproduction, by the influence of environment, threw off genera which did not go through the complete series of metamorphoses, but are otherwise fully adult, and even... The Primary Factors of Organic Evolution - Page 180by Edward Drinker Cope - 1904 - 547 pagesFull view - About this book
| 1895 - 644 pages
...lines of progression, and has terminated in similar typo of structure. In each line of progression, the acceleration of the period of reproduction, by...plates, and exhibit all the evidences of senility and reversion presented during the old age of the higher genera. JK-raussinti shows partial loss of... | |
| 1904 - 1088 pages
...parallelism •with Dattina and Terebratalia. " In each line of progression in the Terebratellidse, the acceleration of the period of reproduction, by...plates, and exhibit all the evidences of senility." In 1893 there was discovered in the Utica formation near Rome, New York, a thin band not more than... | |
| 1893 - 1266 pages
...permanent in individuals evidently fully adult. In each line of progression in the Terebratellidse, the acceleration of the period of reproduction, by...plates, and •exhibit all the evidences of senility. EXPLANATION OF PLATE. Morphogeny of Magellaniinse. The figures in the left hand column, AH, represent... | |
| Newton Horace Winchell - 1893 - 462 pages
...Terebratalia is also inexact parallelism with Terebratella.'' (p.383.) "In each line of progression, the acceleration of the period of reproduction, by...plates, and exhibit all the evidences of senility and reversion presented during the old age of the higher genera." (p. 388.) " Progressively through... | |
| 1893 - 474 pages
...equivalent to Ma9ellania, and Terebratalia is also inexact parallelism with Terebratella.' ' (p.383.) age; so that nearly every stage passed through by...plates, and exhibit all the evidences of senility and reversion presented during the old age of the higher genera." (p. 388.) " Progressively through... | |
| Newton Horace Winchell - 1893 - 476 pages
...Moreover, the lower genera are not merely equivalent to or in exact parallelism with the early etagee of the higher, but they express a permanent type of...of development, but thicken the shell and cardinal procese, absorb the deltidial plates, and exhibit all the evidences of senility and reversion presented... | |
| Edward Drinker Cope - 1896 - 576 pages
...3 3 i O S' o1 P) 3 BB 1 llrllrllllif mlllll lsmenlorm plllllorm llstlllorm 7; B O r en H o o O PI S 3 an adolescent condition. Similar comparisons may...plates, and exhibit all the evidences of senility. 2. PARALLELISM IN THE CEPHALOPODA. Among Mollusca it is well known that the Cephalopoda form a number... | |
| Edward Drinker Cope - 1896 - 580 pages
...§ B B O M 0 cn ffff fffffif B fmfmfm "2. 5* ; ffffmfms gwymfms 3m CL cn a. O* H 3 O M 0 o3 n § i an adolescent condition. Similar comparisons may be...plates, and exhibit all the evidences of senility. 2. PARALLELISM IN THE CEPHALOPODA. Among Mollusca it is well known that the Cephalopoda form a number... | |
| Edward Drinker Cope - 1896 - 602 pages
...simpler genera. It is evident that in the identification of specimens belonging to the Terebratellidse, whether recent or fossil, the strict specific characters...plates, and exhibit all the evidences of senility. 2. PARALLELISM IN THE CEPHALOPODA. Among Mollusca it is well known that the Cephalopoda form a number... | |
| California Academy of Sciences - 1897 - 568 pages
...parallelism with, the early stages of the higher, but they express a permanent type of structure, so far as these genera are concerned, and after reaching...plates, and exhibit all the evidences of senility." If, then, the morphologist tries to study the race history in one of these species thus arrested in... | |
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