. Bulletin of the Natural History Museum Zoology. Fig. 1. 'Yoldia abyssicola' Torell. Right valve, redrawn from Seguenza (1877), synonymized with Leda producta Monterosato and Yoldia striolata Brugnone. Scale = 1mm. Ledella suhlevis, which also has a widespread distribution in the Atlantic and extends into the southwest Pacific (Allen and Hannah, 1989). Further compexity in the synonymy of N. salicensis concerns so- called varieties of 'Leda pusio Philippi' a species that has recently been investigated by Laghi (1986).. Fig. 2. Neilonella salicensis. a, view of shell, from Atlantis II station
. Bulletin of the Natural History Museum Zoology. Fig. 1. 'Yoldia abyssicola' Torell. Right valve, redrawn from Seguenza (1877), synonymized with Leda producta Monterosato and Yoldia striolata Brugnone. Scale = 1mm. Ledella suhlevis, which also has a widespread distribution in the Atlantic and extends into the southwest Pacific (Allen and Hannah, 1989). Further compexity in the synonymy of N. salicensis concerns so- called varieties of 'Leda pusio Philippi' a species that has recently been investigated by Laghi (1986).. Fig. 2. Neilonella salicensis. a, view of shell, from Atlantis II station 73 in the North America Basin, drawn from the left side; b. outline of shell from Biogas VI station DS 86 in the West European Basin to show difference in shape. Scale = I mm. L. pusio is rostrate and not a neillonellid, but a ledellid, possibly synonymous ( Jeffreys 1870)(Laghi, 1986). Jeffreys (1879) reporting on Leda pusio taken by the 'Lightning'and 'Porcu- pine' Expeditions, refers to what he thought was a variety of this species which he had previously named L. pusio 'or (Jeffreys, 1876) and which he changed to L. pusio of Seguenza (1877). Laghi (1986) proposed a new genus Pseudoneilonella to accommodate this latter and raised to species level a number of the records of Jeffreys (1876, 1879). Since then, Waren (1989) has synonymized these with Neilonella salicensis and this we confirm. Jeffreys (1879) also listed a further variety which he called semistriata and which is now regarded as a separate species (Waren, 1989). In his detailed analysis Waren (1989, figs 17E & F) also. 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 Natural History Museum (London). Andover : Intercept
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