. Bulletin of the Natural History Museum Zoology. Fig. 16 Yoldiella similiris. Lateral views of a series of shells to show changes in shape with growth. Specimens from Sta. 236 Argentine Basin. (Scale = mm).. Fig. 15 Yoldiella spp. Dorsal views of shells of a, Y. obesa Q obesa; b, Y. similiris and c, Y. lucida. (Scale = mm). is particularly noticeable in the larger specimens. The height to length ratio is greater in Y. similiris. Internal morphology (Fig. 14). The internal morphology is very similar to that of Y. lucida. The adductor muscles are unequal in size, the posterior muscle is
. Bulletin of the Natural History Museum Zoology. Fig. 16 Yoldiella similiris. Lateral views of a series of shells to show changes in shape with growth. Specimens from Sta. 236 Argentine Basin. (Scale = mm).. Fig. 15 Yoldiella spp. Dorsal views of shells of a, Y. obesa Q obesa; b, Y. similiris and c, Y. lucida. (Scale = mm). is particularly noticeable in the larger specimens. The height to length ratio is greater in Y. similiris. Internal morphology (Fig. 14). The internal morphology is very similar to that of Y. lucida. The adductor muscles are unequal in size, the posterior muscle is oval and approxi- mately 1/3 the size of the anterior. There are a smaller number of gill filaments (maximum of 11 observed) and the labial palp ridges vary between 11-13. The stomach and style sac appear relatively smaller than those in Y. lucida and the hind gut, while making a single loop on the right side of the body, is not as deep as it is in the latter species. A maturing female ( mm total length) had 203 ova with a maximum 50 W/L 30 80 60 60 50H H/L PL/TL 12 3 4 Length (mm) Fig. 17 Yoldiella similiris. Variation in the ratios of height H/L, width W/L and postero-umbonal length to length against length of a subsample from Sta. 236. Argentine 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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