National September 11 Memorial and Museum

ABSTRACT One of the most telling artifacts in the 9/11 Memorial Museum is the slurry wall, a vestige in situ of the pre-9/11 World Trade Center complex, preserved under Section 106 of the National Historic Preservation Act. This subterranean 20 meter long section of the perimeter wall that surrounded 4.5 hectares of the Trade Center site was never meant to be seen or tell its story. Made of reinforced concrete,and tied back to bedrock, its job was to hold back the waters of the Hudson River. The wall was a marvel of engineering in its time and on 11 September 2001 withstood untold forces and thus acquired new meaning – the once mute, utilitarian object became a symbol of hope and resilience. The slurry wall no longer performs the work it was intended to – there is another loadbearing structure behind it – but remains in conversation with Mother Nature. The wall weeps, which has catalyzed corrosion of the steel, introduced salts and a host of other material concerns. The complexity of the slurry wall, as an artifact and an architectural element of the Museum that affects its environment, has necessitated collaboration between a diverse group of stakeholders to parse its secrets.

SynopsisThis paper is a first report on the Echiurids and Sipunculids of Zanzibar, and deals with the material collected by Dr J. D. Robertson during the years 1948–1950 on the shores of Zanzibar, supplemented with a few dredgings. These collections contained two species of Echiurids and eighteen species and varieties of Sipunculids. Of these, one Echiurid (Ochetostoma zanzibarense) and two Sipunculids (Dendrostoma robertsoniandPhascolion robertsoni) are described as new species. Six others are recorded from the area for the first time. The list of species now described from the Zanzibar area contains eight species of Echiurids and twenty-four species and varieties of Sipunculids. Rich as the area is in species, it is even more remarkable for the numbers of individuals, some species being dominant forms in the population.

(1933). The King Shag of Queen Charlotte Sound. Emu - Austral Ornithology: Vol. 33, No. 1, pp. 44-48.