. Bulletin of the Natural History Museum Zoology. Fig. 73 Yoldiella curta. Outlines of shells of a similar size to show intrapopulation differences in shape. Specimens from Sta. BG IV DS 86 West European Bain. (Scale = mm). 5CH W/L 3CH 80-1 h/l . • /•..,•;• 60J 60- 50 PL/TL .v: Length (mm) Fig. 74 Yoldiella curta. Variation in the ratios of height H/L, width W/L and postero-umbonal length PL/TL to length against length of a sample from Sta. INCAL CP 01 West European Fig. 75 Yoldiella curta. Outlines of shells from the right side to show change in shape with growth. Specimens from St
. Bulletin of the Natural History Museum Zoology. Fig. 73 Yoldiella curta. Outlines of shells of a similar size to show intrapopulation differences in shape. Specimens from Sta. BG IV DS 86 West European Bain. (Scale = mm). 5CH W/L 3CH 80-1 h/l . • /•..,•;• 60J 60- 50 PL/TL .v: Length (mm) Fig. 74 Yoldiella curta. Variation in the ratios of height H/L, width W/L and postero-umbonal length PL/TL to length against length of a sample from Sta. INCAL CP 01 West European Fig. 75 Yoldiella curta. Outlines of shells from the right side to show change in shape with growth. Specimens from Sta. BG I DS 13 West European Basin. (Scale = mm). section of the mid dorsal margin of the body and from there to the anus. A shallow typhlosole is present along the length of the hind gut. Occasional aberrent specimens were recorded with an extra length of gut being accommodated within the general pattern (see Fig. 75). The kidney is well-developed. There is a large pericardial cavity but the heart is relatively small with few muscle fibres in the wall of the ventricle. Gonads occur dorsally from the anterior adductor muscle to just posterior to the stomach and in the anterior part of the body internal to the digestive diverticula and hind gut. The sexes are separate. In one sectioned female ( mm) 27 ova were counted and in other specimens ( and mm) 69 and 70 ova were recorded respectively. The maximum dimension was 108 |xm. This is one of a few deep-water specimens which were brought to the surface alive and from which it was posible to make some observations on the ciliary currents of the mantle and the contained organs. The ciliary sorting mechanisms of the gills, palps, mantle and body were found to be similar to. 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
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