. Fig. 17. Alloposus hardyi. x c. 1-5. (Semi-diagrammatic.) Fig. 18. Alloposus hardyi. Radula. If the rotation is normal, its origin is very obscure. The animal was taken near the surface in water of a depth of 1600 fathoms and must therefore be pelagic. The modifica- tion can have no relation, as far as I can see, to crawling on the bottom, and in any case the normal Octopod posture is suited to this. It is noteworthy that Retroteuthis, which also shows a similar modification, is quite remotely allied to A. hardyi. The suckers tend to be uniserial or very widely alternating except about and j


. Fig. 17. Alloposus hardyi. x c. 1-5. (Semi-diagrammatic.) Fig. 18. Alloposus hardyi. Radula. If the rotation is normal, its origin is very obscure. The animal was taken near the surface in water of a depth of 1600 fathoms and must therefore be pelagic. The modifica- tion can have no relation, as far as I can see, to crawling on the bottom, and in any case the normal Octopod posture is suited to this. It is noteworthy that Retroteuthis, which also shows a similar modification, is quite remotely allied to A. hardyi. The suckers tend to be uniserial or very widely alternating except about and just beyond the margin of the web where they are more or less biserial. They are very prominent but small (6-2 per cent of the mantle length) and extremely weak. Like those of A. mollis (Joubin, 1900, pi. v, fig. 14) they are simple, undifferentiated cups, but the walls are everywhere thinner in A. hardyi. The mantle aperture is as in Alloposina microcotyla (Hoyle, 1904, p. 9) shaped like a flat W. Its pallial edge is non-adherent. The funnel is mainly incorporated in the head, but there is a free tubular portion about 8-10 mm. long. The shape of the funnel-organ is obscure. Unlike the other forms there are a number of longitudinal folds near the aperture, below which are the remains of what may have been a W-shaped funnel-organ. The gills have six to seven filaments in each demibranch.


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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificexpedition