. Bulletin of the Natural History Museum Zoology. Fig. 54 Yoldiella frigida. Lateral view from the right side of the internal morphology of a specimen from Sta. 105 North America Basin. Inset is a right-frontal external view of the stomach. (Scale = mm). For identification of parts see Figs. 34 & 39 Type specimen. Holotype : BM(NH) 1992030, Paratypes: in collection held by Allen. Material. Cruise Sta Depth No Lat (m) Long Gear Date ARGENTINE BASIN Atlantis II 280 256- 3495 36°'S 293 53°;W ES Restricted to one Station at the shelf/slope break of the Argent


. Bulletin of the Natural History Museum Zoology. Fig. 54 Yoldiella frigida. Lateral view from the right side of the internal morphology of a specimen from Sta. 105 North America Basin. Inset is a right-frontal external view of the stomach. (Scale = mm). For identification of parts see Figs. 34 & 39 Type specimen. Holotype : BM(NH) 1992030, Paratypes: in collection held by Allen. Material. Cruise Sta Depth No Lat (m) Long Gear Date ARGENTINE BASIN Atlantis II 280 256- 3495 36°'S 293 53°;W ES Restricted to one Station at the shelf/slope break of the Argentine Basin. Depth range: 256-293 m. Shell description (Figs. 55 & 56). Shell subovate, moder- ately inflated, irregular concentric growth lines and small ridges best developed posteriorly, periostracum pale yellow; umbos anterior to mid line, slightly raised and inwardly. 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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