THE CHROMATOPHORES OF ANIMALS. 129 



How near to the truth, or how far from it, this general- 

 isation is, it must remain with future researches to decide ; 

 but it should be borne in mind that the origin of the 

 chromatic cell is by no means necessarily bound up with 

 the origin of the pigment which it contains. 



The subjoined classification indicates the relations of 

 the different kinds of chromatophore which have been dis- 

 cussed above. 



I. Autoplastic. Form-changes intrinsic. 



1. Holoplastic. Contractile as a whole, e.g., Cteno- 



phora, Isopoda. 



2. Endoplastic. Inner protoplasm alone contractile, 



e.g., Vertebrata, certain Pteropoda. 



II. Alloplastic. Form-changes extrinsic, e.g., Cephalo- 

 poda, certain Pteropoda. 



BIBLIOGRAPHY. 

 ARTHROPODA. 



(1) WEBER, Max. Anatomisches iiber Trichonisciden. Arch, 

 f. mikr. Anat., xix., 1881. 



(2) Matzdorff. Ueber die Farbung von Idotea tricuspidata. 

 Jena Zeit., xvi., 1883. 



(3) Mayer, Paul. Die Caprelliden. Naples Monograph. 



(4) Hoek. Carcinologisches. Tijdschrift d. Nederl. Dierk. 



Vereen, iv., 1879. 



(5) VlAILLANES. Ann. des. Sciences Nat. (6), xiv., pp. 10-13, 



1882. 



(6) M IN CHIN. Quart. Jour. After. Set., xxix., p. 232. 



(7) Mingazzini. Atti R. Accad. Lincei. {Rend.), v., pp. 573-8, 



1889. 



MOLLUSCA. 



(8) Muller, H., u. Gegenbaur. Ueber Phyllirhoe. Zeit. / 



wiss. Zool., v., p. 358, 1854. 



(9) PANCERL Light from Nerve-Cells of Phyllirhoe. Quart. 

 Jour. Micr. Sci., xiii., p. 109, 1873. 



(10) Kolliker, Muller u. Gegenbaur. Bericht. Zeit. f. 



wiss. Zool., iv., p. 299, 1853. 



(11) Gegenbaur. Untersuchungen Liber Pteropoden u. Hetero- 



poden, pp. 56-59. Leipzig, 1855. 



(12) HARLESS. Arch.f. Naturg., xii., 1846. 



