[3] Jenner Weir, Entomologist, 1880, XIII, p. 251.
[4] Jentink, Notes Leyden Mus., 1885, VII, p. 111. Specimens illustrating this peculiarity are in the British Museum.
[5] Proc. Zool. Soc., 1895, p. 850. Plate. Many points beyond that mentioned above are involved in this remarkable case. For example, not only are there males like females, but a small proportion of females resemble the ordinary male type. The stripes are not merely the spots produced, for they occupy different anatomical positions. The spots almost always go with a black ventral surface, but the striped forms nearly always have that region testaceous. Spartium retama, the food-plant, will not grow in England, but if it could be naturalised in America the whole problem might be investigated there and results of exceptional interest would almost certainly be attained.
[6] Doncaster, L., Proc. Zool. Soc., 1905, II, p. 528.
[7] I am not aware that the details of this striking case have ever been worked out. It should be noted that the green and blue forms are not due to simple modification of the red pigment; for these colours, due to interference, fork over the area occupied by the red lines. The distinctions between these forms cannot therefore be simply chemical, as we may suppose them to be, for instance, in the case of many red and yellow forms, and the genetic relationships of the Heliconid varieties would raise many novel problems and be well worth studying experimentally.
[8] Woodeforde, F. C., Trans. North Staffordshire Field Club, XXXV, 1901, Plate.
[9] E. Gallé, Compte Rendus du Congres Internat. de Bot. a l'Expos. Univ., 1900, p. 112.
[10] Flora of Mentone, 1864-8, Nova Acta Acad. Caes., XXXV, 1869.
[11] I owe these facts to Canon A. M. Norman, who showed me illustrative specimens. They were originally described by Bowerbank (Monogr. Brit. Spongiadae, vol. II, pp. 18 and XX; vol. III, Pls. I and III). A specimen of G. compressa measured 5 inches, with a greatest width of 3-1/4 in. G. ciliata was found measuring 3 in. long and 3/4 in. wide. These dimensions are many times those of normal specimens.
[12] Coutagne, G., Recherches sur le Polymorphisme des Mollusques de France, Annales Soc. d'Agric. Sci. et Industr. Lyon, 1895.