PLATE 1 
DESCRIPTION OF FIGURES 
1 Transverse section of an arm of Octopus vulgaris according to Guérin. 
a, epithelium; 6, subcutaneous connective tissue; c, chromatophores; d, vein; 
e, dermal musculature; /, perimuscular connective-tissue membrane; g, external 
oblique muscle; 7, inner oblique muscle; j, inner lateral longitudinal muscle; 
k, external longitudinal muscle; /, internal longitudinal muscle bundle; m, trans- 
verse musculature; m, perinervous connective tissue; 0, layer of ganglia; p, cen- 
tral mass of nerve fibers (neuropil); g, myelin cords; 7, brachial arteries; s, nerve; 
t, sucker; u, sucking cavity; v, adhesive part; w, sphincter. 
2 Muscles according to Ballowitz. A, longitudinal section; B, transverse 
section; a, spiral fibers; b, core; c, nucleus. 
3 Large nerve cell in the axial nerve of the arm of Octopus vulgaris. a, glia 
fiber; b, glia nucleus; c, ectoplasm; d, endoplasm; e, Nissl granules; k, nucleus; 
k’, nucleolus. 
4 Blood-corpuscles from the brachial arteries. 
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