. Bulletin of the Natural History Museum Zoology. Fig. 37. Nuculana vestita. Lateral views of right side of four shells in outline to show differences in shape with increasing size. Specimens from Atlantis II station 203 from the Angola Basin. Scale = 1mm. of the mantle edge. The anterior mantle sense organ is well- developed. The foot is large with the margins of the sole finely papillate. The palps are very small with up to 12 broad folds. The palp proboscides are stout and elongate, even in the contracted state. The gills are elongate and broad with up to 36 gill plates. Propeleda carpenter


. Bulletin of the Natural History Museum Zoology. Fig. 37. Nuculana vestita. Lateral views of right side of four shells in outline to show differences in shape with increasing size. Specimens from Atlantis II station 203 from the Angola Basin. Scale = 1mm. of the mantle edge. The anterior mantle sense organ is well- developed. The foot is large with the margins of the sole finely papillate. The palps are very small with up to 12 broad folds. The palp proboscides are stout and elongate, even in the contracted state. The gills are elongate and broad with up to 36 gill plates. Propeleda carpenteri (Dall 1881) Type specimen. Syntypes, USNM 63151 and MCZ 7936-7938. Type locality. Off Barbados, 'Blake' stations 5, 9, and 21, 100fm-287fm. Cited specimens. BMNH 1995057 Leda carpenteri Dall 1881, 125; 1886, 249, , fig. 10, , Nuculana carpenteri Johnson 1934, 16. Material: Cruise Sta Depth No Lat (m) Long Date Gear ARGENTINE BASIN Atlantis II 237 993- 194 36"'S 53''W ES 60 1011 239 1661- 8 36''S 53"'W ES 1679 240 2195- 8 36°'S 53"'W ES 2323 Specimen USNM 63151 examined by JAA. Previously reported off N. Carolina, Gulf of Mexico and Eastern Caribbean (Dall, 1889; Rice and Kornicker, 1965; James, 1970), the present specimens are from the Argentine Basin. This species has a. Fig. 38. Nuculana vestita. Internal morphology as seen from the right side of a specimen from Atlantis II station 203 from the Angola Basin. For identification of the parts see text-figure 7, p. 106. Scale = 1mm. somewhat unusual distribution from shelf to lower slope depths, 200-2323m Shell description (Figs 39^-1) Shell fragile, semi-transparent, slender, moderately elongate, rostrate with two post umbonal carinae, ornamented with faint concentric ridges; periostracum pale straw colour; umbos small, far anterior (postumbonal length 60-68% of total length), inwardly facing; antero-dorsal margin slightly flattened, ventral margin


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