By W. T. Hillier
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Extra info for A Theory of the Formation of Animals
The cells which compose it are those of the macromeres and of the fourth and fifth quartettes : t h a t is t o say, t h e mid-gut or stomach and t h e hind-gut or intestine are formed from these cells, but the fore-gut or stomodseum, as already described, is made of cells from t h e second and third quartettes. The stomach is of nearly globular shape and its diameter is about half t h a t of the larva itself. The wide m o u t h of the trochophore larva situated between the great ciliated band or prototroch above, and the much lesser ciliated band or metatroch below, leads through the stomodaeum into t h e anterior aspect of t h e stomach.
I n the next chapter suggestions are made as to the nature of these supposed active meridians and main axes. They are abstract things, and regarded as modified parts of one and t h e same cycle, as shown in Fig. 22. I n Fig. 21 t h e main axes are not shown. Each contorted gutter consists of an enormous number of successive positions of the active meridian, and might have been drawn as shown in Fig. 23, if such a method of depicting t h e m would not have spoilt t h e clearness of 52 THE FORMATION OF ANIMALS the diagram as a whole.
The structures which the cells of the embryo perforce have to build. There are some interesting points which the reader may take note of now. The stomach, inasmuch as it represents one blastular cavity stowed within another (which is the trochophore larva), is built up by all the four phantoms that enter into the composition of Polygordius. This is as it should be, for all metazoan animals exhibit a gastrular stage. The other points of interest concern the spiral curves. THEORY OF DEVELOPMENTAL HISTORY 55 I n order t o find t h e course which a spiral curve takes, provided it is a perfectly regular one, a very simple way is t o draw a large circle with a large number of evenlyspaced radii.
A Theory of the Formation of Animals by W. T. Hillier