Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 676
angles. The transition between the extreme forms is foundto be so gradual when a number of specimens are compared, thatno lines of specific distinction can be drawn between them ; and thedifference in the number of rays is probably of no more account inthese low forms of Animal life, than it is in…
Microscopy · Biology
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