. Bulletin of the Natural History Museum Zoology. B. Fig. 16. Neilonella whoii. a, right lateral view of shell of elongate form, from Atlantis II station 242 from the Argentine Basin, in right lateral view and b, detail of the umbonal region of the same shell in dorsal view. Scales = 1 mm. ALLEN AND SANDERS Family Nuculanidae Adams and Adams 1858 A recent definition of the family is given by Allen, Sanders and Hannah (1995). Subfamily Ledellinae Allen and Sanders 1982 The subfamily is defined by Allen and Hannah (1989) and comprises two genera, Ledella and Tindariopsis. Genus LEDELLA
. Bulletin of the Natural History Museum Zoology. B. Fig. 16. Neilonella whoii. a, right lateral view of shell of elongate form, from Atlantis II station 242 from the Argentine Basin, in right lateral view and b, detail of the umbonal region of the same shell in dorsal view. Scales = 1 mm. ALLEN AND SANDERS Family Nuculanidae Adams and Adams 1858 A recent definition of the family is given by Allen, Sanders and Hannah (1995). Subfamily Ledellinae Allen and Sanders 1982 The subfamily is defined by Allen and Hannah (1989) and comprises two genera, Ledella and Tindariopsis. Genus LEDELLA Verrill and Bush 1897 Type SPECIES. Ledella bushae Waren 1978. SD - Waren 1981. Shell small, short, robust, surface matt, concentric sculpture, in some species scattered incomplete radial striae, usually rostrate, single postero-dorsal ridge in some species, postero-ventral margin very slightly sinuous, ventral margin in older specimens maybe flattened, anterior and posterior hinge teeth series separated by edentulous space bearing short internal amphidetic ligament (resilium) which may be restricted to dorsal portion of hinge plate, outer layer of ligament visible externally and maybe extended anteriorly and posteriorly for a short distance, hind gut with various configurations. Genus TINDARIOPSIS Verrill and Bush 1897 TYPE SPECIES. Malletia (Tindaria) agatheda Dall 1889. OD. Shell veneriform, matt surface, concentric sculpture, umbo large, short rostrum defined by slight radial ridge and furrow, postero- ventral margin slightly sinuous, anterior and posterior hinge teeth separated by very small edentulous space, internal ligament small, close to shell margin, external ligament robust, amphidetic. Ledella acinula (Dall 1890) Type specimen. Holotype USNM 95438. Type LOCALITY. Fish Commission Steamer 'Albatross' Sta. 2754, 11°40'N 58°33'W, East of Tobago, 1609m. Cited specimens. BMNH 1995047 Malletia (Tindaria) acinula Dall, 1890, 253, , Tindaria acinula Ve
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