Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 713
Transverse Section of central portionof Spine of Acrocladia, showing its moreopen network. 632 UALCAEEOUS SKELETON OF ECHINODEEMATA. make a thin transverse section (Plate n., fig. 1) of almost any spinebelonging to the genus Echinus (the small spines of our British … One of the segments of the calcareous skeleton of an AmbulacralDisk of Echinus. species, however, being exceptional in this respect) or its immediateallies, we see it to be made up of a number of concentric layers,arranged in a manner that strongly reminds us of the concentricrings of an Exogenous…
Microscopy · Biology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
