[410]. Semper came near to discovering the fact when he saw, at Heligoland, ripe eggs in a Phoxichilidium that was, nevertheless, totally destitute of ovigerous legs. The animal, he says, was adult and sexually mature: “Trotzdem fehlen dem Tiere die Eierträger vollständig; es muss sich also das Tier noch mindestens ein Mal häuten vor der Eierablag, und dabei müssen die Eierträger gebildet werden.” (Arb. Inst. Würzburg, 1874, p. 273).
[411]. The correspondence is not universally admitted. Meinert (Ingolf Expedition, 1899) believes that the second and third appendages of the larva disappear, and that the palps and ovigerous legs are new developments; so giving to the normal Pycnogon nine instead of seven appendages. See also Carpenter “On the Relationship between the Classes of the Arthropoda,” Proc. R. Irish Acad. xxiv., 1903, pp. 320–360. The latest observer (Loman) inclines to the older view.
[412]. A slightly different account is given of the Australian P. plumulariae by v. Lendenfeld (Zeitschr. wiss. Zool. xxxviii., 1883, pp. 323–329).
[413]. Zur Lehre vom Generationswechsel und Fortpflanzung bei Medusen und Polypen, 1854.
[414]. Rep. Brit. Ass. 1859; cf. “Gymnoblastic Hydroids,” Ray Soc. pl. vi. fig. 6.
[415]. Trans. Tyneside Field Club, v. (1862–3), 1864, pp. 124–136, pls. vi., vii.; Ann. Mag. Nat. Hist. (3), ix., 1862, p. 33.
[416]. See also Hallez, Arch. Zool. Exp. (4), v., 1905, p. 3; Loman, Tijdschr. Ned. Dierk. Ver. (2), x., 1906, p. 271, etc.
[417]. “On Hydroid and other Corals,” 1881, p. 78.
[418]. Hugo Mertens, Mitth. Zool. Stat. Neapel, xviii., 1906, pp. 136–141.
[419]. One is tempted to explain such cases as the above of harmonious or identical coloration by the simple passage of pigments unchanged from the food.