Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 866
Pig. 613.—Section of shell of Echinusshowing the calcareous network ofwhich it is composed: a a, portionsof a deeper layer. … Fig. (514.—Trans-verse section of cen-tral portion of spine of Heterocen-irotus, showing its more open net- smaller plates interposed between the larger spine-bearing plates ofits box-like shell. If the entire disc be cut of}, and be mountedwhen dry in Canada balsam, the calcareous rosette may be…
Microscopy
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