Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 581
formed atonce, since no addition could be made either to its length orto its diameter, save on the outside of this sheath, where it isnever to be found. The sheath itself often rises-up in pro-miuent points or ridges on the surface of these spines; thusgiving them a character by which they may be… … Spiiies of Spatangus. posed of the like regularly-reticulated substance; and manyof these are very beautiful objects for the lower powers of theMicroscope, when examined by reflected light, and laid upona black ground, without any further preparation.—It is inte-resting also to find that the same…
Microscopy
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