Figure 26 1 Ammotium cassis . 2 Cassidulina reniforme . 3 Dentalina ittai . 4–9 Eggerella advena (4–7 are deformed). Scale bar = 40 μm unless otherwise indicated.

PLATE 2 1 Ammotium cassis (Parker) apertural view; 2 Cribrostomoides crassimargo (Norman); apertural view; 3 Cribrostomoides jeffreysi (Williamson), side view; 4 Cribrostomoides jeffreysi , apertural side view; 5 Cribrostomoides subglobosum (Sars), side; 6 Cribrostomoides

Fig. 9. The occurrence of Ammotium cassis in the Kiel Bight and multi-decadal variations of temperature and salinity of Baltic Sea waters at depth as depicted by end-member records of inflowing Kattegat Water from the Koljö Fjord ( Filipsson & Nordberg, 2004a ) and remaining Deep Water from

Fig. 7. Depth-distribution and abundance of the four-ranked species from 1962 to 2004 (data from Lutze, 1965 , 1974 ; Wefer, 1976 ; this study). Note the successive displacement and decline of Elphidium incertum and Ammotium cassis .

Figure 7. Agglutinated benthic foraminifera from the Herschel Basin. 1 Ammotium cassis. 2 Lagenammina difflugiformis. 3 Textularia earlandi. 4 Spiroplectammina biformis. 5 Eggerelloides advenus. 6 Portatrochammina karica. 7 Textularia torquata. 8 Cribrostomoides crassimargo. 9

Fig. 8. Depth-distribution and standing stock of the four-ranked species from 1962 to 2004 (data from Lutze, 1965 , 1974 ; Wefer, 1976 ; this study). Note the high variability of Elphidium species and the rather constant population density of Ammotium cassis where it occurs.

Chaster, 19. Ammotium cassis (Parker).

Figure 2. Electron micrographs of taxa from the eastern Mississippi Sound area. 1 Pseudothurammina limnetis , 1a attached to plant detritus, GB55S A; 1b free specimen, GB50S A; 2 Ammoastuta inepta , side view, GB50S A; 3 Ammotium cassis , GB36S A; 4 Ammotium salsum , GB36G A; 5

Leptohalysis collinsi Bell, SGB 6, MU 61981. 5, 6 Ammobaculites exiguus Cushman and Brönnimann: 5, SGB 3, MU 61982; 6, SGB 2, MU 61984 (scale bars = 50 μm). 7 Simobaculites barwonensis (Collins), SGB 17, MU 61985. 8 Warrentia ? sp., SGB 14, MU 61986 (scale bar = 500 μm). 9 Ammotium cassis (Parker

glomerata (Brady); B, 19–20 cm. 23–25 Ammotium cassis (Parker); B, 9–10 cm, 9–10 cm, 3–4 cm. 26 Eggerella advena Cushman; B, 9–10.