. Bulletin of the British Museum (Natural History), Geology. BENTHIC LUDLOW COMMUNITIES 253 organisms as substrates, and confronted newly-recruited larvae, on the average, with the same type of sediment bottom occupied by their parents. Sediment dilution of organic remains would preclude the inheritance of accumulated biological information, as discussed by Margalef (1968), which is necessary for new generations to proceed beyond the organizational state of their pre- decessors. In this situation, only a change in the external environment can cause an alteration of community structure.

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. Bulletin of the British Museum (Natural History), Geology. BENTHIC LUDLOW COMMUNITIES 253 organisms as substrates, and confronted newly-recruited larvae, on the average, with the same type of sediment bottom occupied by their parents. Sediment dilution of organic remains would preclude the inheritance of accumulated biological information, as discussed by Margalef (1968), which is necessary for new generations to proceed beyond the organizational state of their pre- decessors. In this situation, only a change in the external environment can cause an alteration of community structure. WEN LOCK LUDLOW PR IDOL I Ross Brook Fm. Wenlock elastics Whitcliffe Beds Jones Creek Fm. Nova Scotia 0 50% i—i—i—i—i—i I I 10 & Britain Britain 40 V, mMis. New Brunswick. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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