Gorthner, A. - Bau, Funktion und Evolution komplexer Gastropodenschalen in Langzeit-Seen. Mit einem Beitrag zur Paläobiologie von Gyraulus "multiformis" im Steinheimer Becken.

Stuttgart, Staatliches Museum fïr Naturkunde, 1992. 8vo (24.4 x 16.4 cm). 173 pp., ten plates, 56 text illustrations. No wrappers issued. = A detailed study, based on an amazing, uninterupted sequence of sedimental layers in which the evolution of these fresh water snails is perfectly preserved. Stamp and handwritten numbers on front page; otherwise a very good, clean copy.

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