Annual report of the Board of Regents of the Smithsonian Institution . asc. 3-4, et vol. 11, fasc. 1-2, Var-sovie (1907-8). (7) Letendue des changements possibles de coleur de VHippolyte variansLeach. C. R., t. 147, No. 20 (nov. 190S). (8) Etude experimentale du synchromatisme variable de VHippolyte variansLeach. Bull, internat. de IAcademie Polonaise de Cracovie (nov. 1908). (9) Sur le chlorotropisme normal des Pagures. C. R., t. 147 (nov. 1908). (10) Lapparition rythmique et les stades de passage de Iinversiou experi-mentale du chlorotropisme des Pagures. C. R., t. 147 (dec. 1908). 465 466 A


Annual report of the Board of Regents of the Smithsonian Institution . asc. 3-4, et vol. 11, fasc. 1-2, Var-sovie (1907-8). (7) Letendue des changements possibles de coleur de VHippolyte variansLeach. C. R., t. 147, No. 20 (nov. 190S). (8) Etude experimentale du synchromatisme variable de VHippolyte variansLeach. Bull, internat. de IAcademie Polonaise de Cracovie (nov. 1908). (9) Sur le chlorotropisme normal des Pagures. C. R., t. 147 (nov. 1908). (10) Lapparition rythmique et les stades de passage de Iinversiou experi-mentale du chlorotropisme des Pagures. C. R., t. 147 (dec. 1908). 465 466 ANNUAL EEPOKT SMITHSONIAN INSTITUTION, 1909. or unfamiliar; on the contrary, many people, including the bathers onthe Breton coast, are acquainted with the creatures that I am going to discuss, which are commonlycalled by the name of sea-spiders. These self-disguising Crustacea,although they belong exclusivelyto the rather restricted group ofBrachyura Oxyrhyncha, are verycommon, not only along all theEuropean coasts (of the Mediterra-nean, the English Channel and the. Fig. 1.—Disposition of the dorsal hooksin Maja verrucosa M. Edw. (Onlythe right side is completely drawn.)


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