. Bulletin of the British Museum (Natural History) Zoology. 72 N. callicredemna originally taken from off Tobago in 1609 metres (Dall, 1890) is now known to be common in the Gulf of Mexico in depths ranging from 2122 metres to 3563 metres (James, 1972). The one specimen taken off Recife in the Brazil Basin now extends the range of the species approxi- mately 2180 km south. Material RHIND AND ALLEN Nucula callicredemna: Measurements (from James, 1972) Cruise Sta Depth No Lat Long (m) Gear Date Brazil basin Atlantis II 156 3459 1 00°'S 29°'W ES Guyana basin Knorr 306 3
. Bulletin of the British Museum (Natural History) Zoology. 72 N. callicredemna originally taken from off Tobago in 1609 metres (Dall, 1890) is now known to be common in the Gulf of Mexico in depths ranging from 2122 metres to 3563 metres (James, 1972). The one specimen taken off Recife in the Brazil Basin now extends the range of the species approxi- mately 2180 km south. Material RHIND AND ALLEN Nucula callicredemna: Measurements (from James, 1972) Cruise Sta Depth No Lat Long (m) Gear Date Brazil basin Atlantis II 156 3459 1 00°'S 29°'W ES Guyana basin Knorr 306 3392 4 09°'N 56°'W ES Venezuela basin Norda 33 3800- 4035 1 15°'N 69°'W OT 35 3954- 4017 16 15°'N 69°'W OT 36 3951- 4044 24 15°'N 69°'W OT 37 3995- 4097 11 15°'N 69°'W OT 38 3995- 4013 15 15°'N 69°'W OT 39 3993- 4065 1 15°'N 69°'W OT 40 3967- 4009 11 15°'N 69°'W OT 87 3482- 3518 22 13°'N 64°'W OT 88 3516- 25 13°'N 64°'W OT 25- 3550 90 3422- 3464 19 13°'N 64°'W OT 26- 91 3459- 3503 12 13°'N 64°'W OT 92 3476- 34 13°'N 64°'W OT 27- 3518 93 3411- 3459 21 13°'N 64°'W OT 94 3428- 3476 11 13°'N 64°'W OT 28- Shell description The original shell description by Dall, (1890) is detailed, although as pointed out by James, (1972) it is in reverse ie. in the description anterior is posterior and vice versa. A sum- mary description is given here. Shell large, ovoid, lustrous, equivalve, inequilateral, sur- face covered in fine concentric ridges, radial striations give surface a fine reticulated appearance; umbos (frequently eroded) posterior to the midline, opisthogyrate; when poste- rior margin orientated vertically the anterior dorsal margin is above the horizontal; lunule long, escutcheon short and broad, den
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