Dear Sean,
do you know the following paper?
Plate, Susanne & Husemann, Eginhard (1994)
Identification guide to the planctonic polychaete larvae around
the island of Helgoland (German Bight).
Helgolaender Meeresuntersuchungen, 48: 1-58.
If the address of the authors is still actual, you can call them at
Ruhr-Universitaet Bochum
Lehrstuhl fuer Spezielle Zoologie und Parasitologie
Postfach 10 21 48
D-44721 Bochum
I suppose they still have their material.
Hope that I could help you.
Frank Licher
--------------------------------------------------------
Frank Licher <LICHER at cipfb5.biologie.uni-osnabrueck.de>
Universitaet Osnabrueck, FB 5, Spezielle Zoologie
D-49069 Osnabrueck, Germany
Tel: +49-(0)541-969-2859 Fax: +49-(0)541-969-2870
