. Bulletin of the Natural History Museum Zoology. Fig. 68 Yoldiella inconspicua profundorum. Lateral view from the right side of the internal morphology of a specimen from Sta. 242 Argentine Basin. (Scale = mm). For identification of the parts see Fig. 34. (but broader than in Y. inconspicuous ) short, with up to 7 teeth on each side; ligament amphidetic, large, slightly elon- gate, short external secondary extensions of fused perios- tracum on either side of umbo. The shell shape of this subspecies while similar to that of Y. inconspicua is slightly more rounded, in particular th
. Bulletin of the Natural History Museum Zoology. Fig. 68 Yoldiella inconspicua profundorum. Lateral view from the right side of the internal morphology of a specimen from Sta. 242 Argentine Basin. (Scale = mm). For identification of the parts see Fig. 34. (but broader than in Y. inconspicuous ) short, with up to 7 teeth on each side; ligament amphidetic, large, slightly elon- gate, short external secondary extensions of fused perios- tracum on either side of umbo. The shell shape of this subspecies while similar to that of Y. inconspicua is slightly more rounded, in particular the posterior limit of the shell margin is medial instead of supramedial. The hinge plate is broader and the teeth stron- ger in Y. i. profundorum. Maximum recorded shell length: mm. ALLEN, SANDERS AND F. HANNAH Shell measurements (mm) & ratios are as follows:- Length Height Width H/L W/L PL/TL Internal morphology (Fig. 68). Very similar to that of Y. inconspicua and Y. argentinea. In Y. i. profundorum, size for size, the posterior adductor muscle is more elongate than in Y. inconspicua , the palps are slightly smaller and the ridges are broader but not as long and slightly fewer in number (12-14 internal ridges). Yoldiella argentinensis (new species) Type locality. Atlantis II, Cruise 60, Sta. 237, Argentine Basin, , 36°'S, 53°'W, Epibenthic Trawl, 993-1011 m. Type specimen, presently housed in the Sanders collection. Woods Hole Oceanographic Institution, Paratypes: in collec- tion held by Allen. Material. Cruise Sta Depth No Lat Long (m) Gear Date 53°'W ES 53°'W ES ARGENTINE BASIN Atlantis II 236 497-518 3 36°'S 60 237 993- 26 36°'S 1011 239 1661- 26 36°'S 53°;W ES 1679 Y. argentinensis has only been recorded from Argentine. Fig. 69 Yoldiella argentinensis. Lateral view of the shells from the right side t
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