. Bulletin of the British Museum (Natural History) Zoology. galatheae pustulosa hampsoni verdiensis lusitanensis sublevis sandersi ultima Fig. 80 The distribution of the Ledella species in the Atlantic. sande similis verdiensis oxira. galathe solidula acuminata Thus, the length of the hind gut and its relationship to the depth at which its possessor lives is not entirely consistent. Species possessing a short single loop are not all found at slope depths, but in general most abyssal species have long hind guts. Conversely elongate hind guts can be found in a few upper slope species and presuma
. Bulletin of the British Museum (Natural History) Zoology. galatheae pustulosa hampsoni verdiensis lusitanensis sublevis sandersi ultima Fig. 80 The distribution of the Ledella species in the Atlantic. sande similis verdiensis oxira. galathe solidula acuminata Thus, the length of the hind gut and its relationship to the depth at which its possessor lives is not entirely consistent. Species possessing a short single loop are not all found at slope depths, but in general most abyssal species have long hind guts. Conversely elongate hind guts can be found in a few upper slope species and presumably give digestive advantage. In a small species an enlarged gut has the disadvantage of restricting the space for gonadial development but then food pustulosa modesta jamesi lusitanensis parva ult ima Fig. 81 The radiative evolution of hind gut configurations in species of Ledella. reserves are in such short supply in deep water as to limit egg production. Presumably there is a fine balance between energy supply and space apportionment. In this regard adap- tive advantage would appear to be in the exceptional change of direction of shell growth as seen in L. ultima and with the consequent enlargement of shell space. L. ultima is certainly the numerically and geographically the most successful species of the 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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