Synopsis A detailed account is given of the classification of 555 Nd I lines in the spectrum of the electrodeless discharge. A comparison is made with the temperature classification known for 278 lines in the table. Zeeman effect measurements are reported for 110 classified lines observed in the spectrum of the hollow cathode operating in weak magnetic fields. From these splittings the g -factors of nearly 75% of all levels could be determined and the J-values could be checked so that only very few ambiguities remain. A discussion is given of the isotope shifts as measured by various authors in connection with the line classifications. Although configurations are far from pure, a definite correlation is established that will have to be taken into account when new identifications are made.