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Volume 72, 1942-43
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[1] Arey, L. B., and Crozier, W. J., 1919. Sensory Responses of Chiton, Journ. Exp. Zool., 29.

[2] Clark, W., 1885. On the Phenomenon of Reproduction of the Chitons, Ann. of Nat. Hist., 2, ser. XVI.

[3] Crozier, W. J., 1918. Growth and Duration of Life of Chiton tuberculatus, Proc. Nat. Acad. Sci., 4.

[4] —– 1918. Growth of Chiton tuberculatus in Different Environments, Proc. Nat. Acad. Sci., 4.

[5] —– 1921. Homing Behaviour of Chiton, Amer. Nat. New. York, 55.

[6] Fox, H. M. Lunar Periodicity in Reproduction, Nature, 130, p. 23.

[7] Graham, D. H., 1942. Breeding Habits of Twenty-two Species of Marine Molluscs, Trans. Roy. Soc. N.Z., 71.

[8] Hammarsten, D., and Runnström, J., 1926. Zur Embryologie von Acanthochiton disorepans (Brown), Zool. Jahr., 47.

[9] Heath, H., 1905. The Breeding Habits of Chitons of the Californian Coast, Zool. Anz., Bd., 29.

[10] Lovèn, —, 1856. Ueber die entwicklung von Chiton, Ann. Mag. Nat. Hist., 17.

[11] Metcalf, M. M., 1893. Contributions to the Embryology of Chiton, Stud. Johns Hopkins Univ., 5.

[12] Powell, A. W. B., 1937. The Shellfish of New Zealand.

[13] Suter, H., 1915. Manual of the New Zealand Mollusca.

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Fig. 1 Three specimens of Cryptoconchus porosus photographed in the aquarium. The male on the lett is clinging to the side of the tank just below the water level. A string of white sperms is pouring from the exhalant respiratory aperture at the posterior end. The general whiteness of the floor of the tank is due to the presence of sperms. Both the other individuals are females, the one on the light resting after spawning. whilst the central one is in the act of extruding eggs, which can be seen as a grey mass on the floor of the tank between the two females.
Fig. 2 Drawings of a male (left) and a female (right) made from photographic negatives. The male is shown spawning on the floor of the tank, and the force by which sperms exit by the exhalant respiratory aperture at the posterior end is illustrated. Note the inhalant respiratory aperture at the anterior end. The female shows the usual position for spawning, head directed downwards, posterior region of foot and mantle elevated, mantle edges rolled in over pallial groove in this region. The eggs are shown pouring out of the exhalant respiratory aperture passing down the back of the animal in a long gelatinous string, and forming a pile on the floor of the tank.

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Dates and Times of Spawning of Cryptoconchus Porosus