Spondylus gravis Fulton, 1915
FULTON, H. C. 1915. List of the Recent species of Spondylus Linne with some notes and descriptions of six new forms. The Journal of Conchology, 14 (11, 12): 331-338, 353-362. [p. 358]
1915 Spondylus gravis Fulton, 1915
«Shell oval, of a heavy solid substance; umbonal area white, the rest of the exterior of a rather light purple-brown colour; both valves with numerous longitudinal rugose ridges, which are more prominent on the right or lower valve; there are also numerous fine striae between the ridges, these with the concentric lines of former margins give the shell, especially the less-worn undervalve, a rough wavy appearance; judging by the way in which light shews through the undervalve, it is not absolutely solid, but probably of the same laminar construction as in the so-called water-Spondylus, S. varius Sowb. Interior margin crenulated and edged with same colour as exterior; ligamental area greatly produced, somewhat twisted, and forming a triangle, the sides of which are about 55 mm. in length.
Maximum dimensions: Height (umbo of lower valve to ventral margin), 144 mm.; width (anterior to posterior margin), 102 mm.; depth or diameter, 67 mm. Hab. ?» HUGH COOMBER FULTON, 1915
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