1 - Relay-crystals of common salt
2 - Spicules of Grantia and other calcareous sponges
3 - Spicules of tetractinellid sponges. a–e, anatriaenes; d–f, protriaenes.
4 - Spicules of hexactinellid sponges
5 -Crane-head and femur
6 - Suture-line of a Triassic Ammonite (Pinacoceras)
7 - Phractaspis prototypus
8 -Oithona nana; Sapphirina.
9 - 1. Harpinia plumosa Kr. 2. Stegocephalus inflatus Kr. 3. Hyperia galba.
10 - a, Cladocarpus crenatus, F.; b, Aglaophenia pluma, L.; c, A. rhynchocarpa, A.; d, A cornuta, K.; e, A. ramulosa
Post #1353
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On growth and form by D'Arcy Thompson