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The present investigation has been undertaken in order to endeavour to determine the tubular nature of the strim from without, in the enamel of certain fish, and their functional significance, and to show that, in the Sparidre and Labridre, the mode of development of the enamel differs in essential particulars from that hitherto described in fish, a regular penetration by vascular tubes and a secreting structure in the enamel organ being demonstrable. A penetration of the enamel by tubes from the dentine is very commonly found in fish, and a strongly marked striation from the outer surface, which does not reach the dentine, is also seen in many groups.

VII. On the structure and development of the tubular enamel of the sparidæ and labridæ