. The Cambridge natural history. Zoology. PAGURIDEA EVOLUTION OF HERMIT-CRABS 179 hard plates, and re-acquiring, to a greater or less degree, a secondary symmetry of form. But the story of Pagurid evolu- tion does not apparently stop here. The genus Farcdomis, from tlie West Coast of America, superficially resembles Porcellana, and is held to be descended from such forms as Pylocheles, while isolated. Fic;. 123.—Four stages in the development oi Eupagurus longicaiyusov E. atmvlipes, x 20. A, Ventral view of Zoaca ; B, lateral view of Metazoaea ; C, dorsal view of Glau- cothoe ; D, do
. The Cambridge natural history. Zoology. PAGURIDEA EVOLUTION OF HERMIT-CRABS 179 hard plates, and re-acquiring, to a greater or less degree, a secondary symmetry of form. But the story of Pagurid evolu- tion does not apparently stop here. The genus Farcdomis, from tlie West Coast of America, superficially resembles Porcellana, and is held to be descended from such forms as Pylocheles, while isolated. Fic;. 123.—Four stages in the development oi Eupagurus longicaiyusov E. atmvlipes, x 20. A, Ventral view of Zoaca ; B, lateral view of Metazoaea ; C, dorsal view of Glau- cothoe ; D, dorsal view of stage. , 6tli alxloniinal appendage ; , , 1st and 3rd maxillijjedes. (After M. T. Thompson.) Species are known (though not well known), sucli as Ti/Iaspis, described in the Chcdlenfjer licport)^} which appear to be Pagurids that have deserted tlieir shells. The metamorphosis of the Hermit-crabs has recently been studied by ]\I. T. ; The Zoaea (Pig. 123, A) differs from that of the Cialulbcidca mainly in the absence of the long spines. It possesses tlie usuiil ^ Vol. xxvii. ]). 81. * Proc. Boston Soc. Xul. Hist., xxxi., 1904, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. London : Macmillan and Co. ; New York : The Macmillan Company
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