124 



TERRA NOVA " EXPEDITION. 





9 



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Fig. 13. — Outline dorsal views of the bodies of a series of " crabs" — a, Porcellanopagurus ; 

 h, Tylaspis ; c, Ostraconotus (after Milne- Edwards) ; d, Birgus ; e, Lomis ; 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. 



