. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 169. Occasional exceptions can be found to these general rules. Thus, L. jamesi common in the Argentine and Guinea Basins does not occur to the north and to the east. Such a distribu- tion is known from other protobranch groups (Allen & Sanders in m/s, Sanders & Allen, 1965). In addition the benthic slope and abyssal bivalve faunas of the Argentine and Guiana Basins tend to have a high degree of endemism, but, unlike the impoverished fauna of Norwegian basin which also has a high degree of endemism, the
. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 169. Occasional exceptions can be found to these general rules. Thus, L. jamesi common in the Argentine and Guinea Basins does not occur to the north and to the east. Such a distribu- tion is known from other protobranch groups (Allen & Sanders in m/s, Sanders & Allen, 1965). In addition the benthic slope and abyssal bivalve faunas of the Argentine and Guiana Basins tend to have a high degree of endemism, but, unlike the impoverished fauna of Norwegian basin which also has a high degree of endemism, the isolated fauna off the East coast of South America is relatively rich in species. This is possibly correlated in some way to the north moving, rela- tively organically rich bottom water. MORPHOLOGICAL EVOLUTION. 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 Farn, Alexander E. London : Butterworths
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