. Evolution and its relation to religious thought . Fig. 60.—Heterocercal or vertcbrated tail-fin. a, form ; b, structure. PROOFS FROM EMBRYOLOGY. 155 (Fig. 59, b) ; in the latter the backbone runs throughthe fin to its very point, growing slenderer by degrees,and giving off rays above and below from each joint,but the rays on the lower side are much longer (Fig. 60,b). This style of fin is, therefore, vertehrated, the othernon-vertebrated. Figs. 59 and 60 show these two stylesin form and structure. But there is still another stylefound only in the lowest and most generalized forms offishes. I
. Evolution and its relation to religious thought . Fig. 60.—Heterocercal or vertcbrated tail-fin. a, form ; b, structure. PROOFS FROM EMBRYOLOGY. 155 (Fig. 59, b) ; in the latter the backbone runs throughthe fin to its very point, growing slenderer by degrees,and giving off rays above and below from each joint,but the rays on the lower side are much longer (Fig. 60,b). This style of fin is, therefore, vertehrated, the othernon-vertebrated. Figs. 59 and 60 show these two stylesin form and structure. But there is still another stylefound only in the lowest and most generalized forms offishes. In these the tail-fin is vertebrated and yet sym-metrical. This style is shown in Fig. 61, A and B
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Keywords: ., bookauthorlecontej, bookcentury1800, bookdecade1880, bookyear1888
