Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 867
hese organs, a regular and•elaborate pattern being formed by their intermixture, which shows■considerable variety in different species. When we make a thintransverse section of almost any spine belonging to the genusEchinus (the small spines of our British species, however, beingexceptional in this… … Fig. 615.—Transverse section of spine oiJEchinometra (fig. 615). The number of these layers is extremely variable, de-pending not merely upon the age of the spine, but (as will presently appear) upon the part ofits length from which thesection happens to betaken. The centre isusually occupied by…
Microscopy
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