Plate 6 — Views of specimen no. 3, in the 'sand' and 'gravel' phases. Unfortunately, the capacity of this specimen for such adaptations proved to be comparatively small. (1911) by Francis Bertody Sumner, from Journal of Experimental Zoology.
Source: MBLWHOI Library / Internet Archive
https://pdimagearchive.org/images/fb38cf3d-bc87-4e1d-958a-9514dd9f1312
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