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“TERRA NOVA” EXPEDITION. 
g h i 
Fig. 13. — Outline dorsal views of the bodies of a series of “ crabs” — a, Porcellanojoagurus ; 
b, Tylaspis ; c, Ostraconotus (after Milne-Edwards) ; d, Birgus ; e, Lornis ; f, Lithodes ; 
g, Porcellana ; h, Albunea ; i, Carcinus. Not drawn to scale. In each case the part 
indicated by a dotted line is normally carried under the rest of the body. 
