. Bulletin of the Natural History Museum Zoology. . Length(mm) Fig. 94 Yoldiella ovata. Lateral views from the right and left side of the internal morphology of a specimen from Sta. 300, Guyana Basin. (Scale = mm). For identification of the parts see Fig. 34. penetrate anteriorly into the visceral mass to any great extent. The sexes are separate. One sectioned female ( mm) contained approximately 50 ova with a maximum diam- eter of 80 u,m. With increasing length, the height/length, width/length and particularly the posterior umbonal length/total length ratios gradually increase (Fig. 93
. Bulletin of the Natural History Museum Zoology. . Length(mm) Fig. 94 Yoldiella ovata. Lateral views from the right and left side of the internal morphology of a specimen from Sta. 300, Guyana Basin. (Scale = mm). For identification of the parts see Fig. 34. penetrate anteriorly into the visceral mass to any great extent. The sexes are separate. One sectioned female ( mm) contained approximately 50 ova with a maximum diam- eter of 80 u,m. With increasing length, the height/length, width/length and particularly the posterior umbonal length/total length ratios gradually increase (Fig. 93). Yoldiella ovata is closely related to Y. biguttata, but can be distinguished by its more ovate outline and not being flat- tened at the postero-ventral shell margin. Yoldiella insculpta (Jeffreys 1879) Fig. 93 Yoldiella ovata. Variation in the ratios of height H/L, width W/L and postero-umbonal length PL/TL to length against length of subsample from Sta. 300, Guyana Basin. Type locality. West of Ireland, Porcupine, 1869, Sta. 16, 54°19'N, 11°50'W, 816 fms. Type specimen. Holotype: not designated. Lectotype: (here. 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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