Subject ASC00001af
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature.
v. 3 (1867), Page 82 (1867)
MBLWHOI Library
BHL Page 1780756
Keywords
#urchin #oceanography Purple urchin Shell purple urchin transverse section echinoderm anatomy Echinus lividus Paracentrotus lividus shell ambulacral disc spine section structure ambularcral disc spine