. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. and Physiology of the Spongida. 23 tube somewhat inflated at its extremity, where the neck of the inflation is surrounded by a sarcodic frill; and from its summit proceeds a long cilium (altogether not unlike the pistil and corolla of a flower), while in the body may be observed a granuliferous sarcode containing a nuclear organ and one or two "contracting vesicles," which, carrying out the simile, would be analogous to the seed-vessel of the flower. Fisr. Fig. 2
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. and Physiology of the Spongida. 23 tube somewhat inflated at its extremity, where the neck of the inflation is surrounded by a sarcodic frill; and from its summit proceeds a long cilium (altogether not unlike the pistil and corolla of a flower), while in the body may be observed a granuliferous sarcode containing a nuclear organ and one or two "contracting vesicles," which, carrying out the simile, would be analogous to the seed-vessel of the flower. Fisr. Fig. 2. Fig. 1. Common form of spongozoon in Grantia compressa. Fig. 2. Not unfrequent form: a, body ; b, nucleus; c c, contracting' vesicles; d, granules of sarcode ; e, grains of food; f, rostrum ;; g, collar ; h, cilium. Scale l-4tk to l-6000th of an inch. The conical bulb-like portion has been called the " body;" the bacilliform tube, the "rostrum" or beak ; the sarcodic frill, the "collar," in the midst of which is the inflated end of the rostrum and the cilium. This, then, is the form of the spongozoon of Grantia com- pressa in its active living state; and that it is the animal of the sponge may be assumed from no other body or cell in the sponge taking in the colouring-matter *. That the particles of colouring-matter pass into the ampul- laceous sac directly through the pore has been demonstrated by the presence of a continuous line of colouring-matter having been seen to exist between the pore on the surface and the ampullaceous sac ('Annals,' 1874, vol. xiii. p. 437); and that subsequently it may pass into the body of the spongozoon through the rostrum or beak (by the side of the cilium, as in such flagellated Infusoria generally) seems most probable, * It must not be thought that the colouring-matter requires to be so minutely divided as for its particles to be almost imperceptible, since the " rostrum " is so expansible that it will
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