Section of a calcareous sponge; Various forms of sponge-spicules; and Canal system of Sycon gelatinosum. From Sea Beach at Ebb Tide, Augusta Foote Arnold, 1901.

---

Size: 2369px × 2932px
Photo credit: © Jennifer Booher / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: apopyle, arnold, augusta, beach, biology, calcareous, canal, cavity, cell, choanocytes, cortex, dermal, diaphragm, ebb, ectoderm, embryo, excurrent, flagellated, flagellum, foote, gastral, incurrent, marine, mesoderm, ovum, oxeate, paragastric, passage, pore-membrane, prosopyle, sea, spicule, spicules, spiculesendoderm, tetraradiate, tide, triradiate