. Bulletin of the Natural History Museum Zoology. 114 ALLEN AND SANDERS. Fig. 18. Ledella acinula. Four shells in outline, from Knorr station 299 from the Guyana Basin, in right lateral view to illustrate changes in shape with increasing size. Scale = 1mm. feeding aperture ventral to the siphonal embayment. The adductor muscles are relatively large, the anterior ovate and the posterior more circular in cross section. The anterior sense organ lies far anterior, ventral to the anterior adductor. The palps and gills are moderate in size with relatively few ridges (up to 15) and plates (
. Bulletin of the Natural History Museum Zoology. 114 ALLEN AND SANDERS. Fig. 18. Ledella acinula. Four shells in outline, from Knorr station 299 from the Guyana Basin, in right lateral view to illustrate changes in shape with increasing size. Scale = 1mm. feeding aperture ventral to the siphonal embayment. The adductor muscles are relatively large, the anterior ovate and the posterior more circular in cross section. The anterior sense organ lies far anterior, ventral to the anterior adductor. The palps and gills are moderate in size with relatively few ridges (up to 15) and plates (up to 17) respectively. The foot has a well-defined neck, this is probably related to the relatively large height of the shell. There is a large 'byssal' gland present in the heel of the hind gut first makes a single loop on the right side of the body before passing to the left side of the body between the oesophagus and the inner face of the anterior adductor muscle. On the left side of the body the hind gut forms a double coil. Because of the anterior penetration of the gut to the left side, the mouth is displaced some distance posterior to the anterior adductor muscle. Ledella aberrata (new species) Type specimen. Holotype BMNH 1995045; paratypes BMNH 1995046. Type LOCALITY. Chain cruise 60, station 247, Argentine Basin, 43°'S 48"'W, 5208-5223m 80- 70J 60- â o-o0- o â °o" PL/, 50- 2 3 Length (mm) I 4 Fig. 19. Ledella acinula. The ratios of height to total length (H/L)(open circles) and post-umbonal length to total length (PL/L)(closed circles) plotted against total length to show changes in shell proportions with increasing length. Specimens from Knorr station 299 from the Guyana Basin. Material: Cruise Sta Depth (m) No Lat Long Date Gear ARGENTINE BASIN Atlantis II 242 4382- 2 38°'S 51''W ES 60 4402 247 5208- 34 43°'S 48''W ES 5223 252 4435 4 38°'S 52"'W ES GUYANA BASIN
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Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
