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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.