. Bulletin of the Natural History Museum Zoology. . Fig. 29 Yoldiella artipica. Lateral view from the right side of the interal morphology of a specimen from Sta. 200 Angola Basin. (Scale = mm). For identification of parts see Fig. 5. Type specimen. Holotype: BM(NH) 1992023, Paratypes: collection held by J. A. Allen. Material in Fig. 30 Yoldiella similis. Lateral view of a shell from right side and a hinge-plate of a left valve compared with the hinge-plate of a specimen of Y. jeffreysi (a) Specimens from Sta. 197, Angola Basin and Sta. 316, West European Basin, respectively. (Scale =
. Bulletin of the Natural History Museum Zoology. . Fig. 29 Yoldiella artipica. Lateral view from the right side of the interal morphology of a specimen from Sta. 200 Angola Basin. (Scale = mm). For identification of parts see Fig. 5. Type specimen. Holotype: BM(NH) 1992023, Paratypes: collection held by J. A. Allen. Material in Fig. 30 Yoldiella similis. Lateral view of a shell from right side and a hinge-plate of a left valve compared with the hinge-plate of a specimen of Y. jeffreysi (a) Specimens from Sta. 197, Angola Basin and Sta. 316, West European Basin, respectively. (Scale = mm). Shell measurements (mm) and ratios are as follows:- Cruise Sta Depth No (m) Lat Long Gear Date Length Height Width H/L W/L PL/TL ANGOLA BASIN Atlantis II 196 42 197 4612- 1 4630 4596 35 10°'S 9°'E ES 10°'S 9°'E ES 198 4559- 12 10°'S 9°'E ES 4566 - 10°'S 9°'E PL = postumbonal length Found at abyssal depths in the Angola Basin. Depth range: 4559-4630 m. Shell description (Fig. 30). Shell small, ovate, very slightly inflated, inequilateral with posterior margin suprame- dially subrostrate, shell with very fine concentric lines, form- ing ridging on ventral half of shell; periostracum pale yellow; umbos slightly raised, internally directed; dorsal margin slightly convex, antero-dorsal margin slopes from umbo to form even curve with anterior margin, ventral margin smoothly curved, posterior margin sharply curved where it meets postero-dorsal margin; hinge strong, moderately broad, extends to anterior and posterior limits of the anterior and posterior adductors respectively; hinge teeth well- developed, equal numbers (maximum 9) on anterior and posterior hinge plates, ligament amphidetic, moderately large, goblet-shaped with very small external extensions. Prodissoconch length: 173 Maximum reco
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