Lunds Univ. Arsskrift., 59, 1-60, 9 figs.
Peyer B. (1935). Die Triasfauna det Tessiner Kalkalpen. 8. Wei- tere Placodontierfunde. Abh. Schweiz. Paleont. Ges., 55, 1- 26, 5 plates.
Peyer B. (1950). Geschichte der Tierwelt. Btichergilde Guten-berg, Zurich.
Peyer B. (1955). Die Triasfauna der Tessiner Kalkalpen. 18. Helveticosaurus zollingeri n.g.n.sp. Abh. Schweiz. Paleont. Ges., 72, 1-50.
Peyer В., Kuhn-Schnyder E. (1955). Placodontia. In: J. Piveteau (ed.), Traite de Paleontologie, 5, 458-486. MassonS. A., Paris.
Repossi E. (1902). Mixosauro degli strati triasici di Besano in Lombardia. Atti della Soc. Ital. di Sci. Nat., 41, 361-372.
Robinson J. A. (1975). The locomotion of plesiosurs. Neues Jahrbuch. Geol. Palaeont. Abh., 149(3), 286-332.
Romer A. S. (1968). An ichthyosaur skull from the Cretaceous of Wyoming. Univ. Wyoming. Contrib. Geol., 7, 27-41.
de Saint-Seine P. (1955). Sauropterygia. In: J. Piveteau (ed.), Traite de Paleontologie. Volume 5; pp. 420-428. Masson S. A., Paris.
Seymour R. S. (1982). Physiological adaptations to aquatic life. In: C. Gans and F. H. Pough (eds.), Bio¬logy of the Reptilia. Vol. 13; pp. 1-51. Academic Press, New York.
Shikama Т., Kamei Т., Murata M. (1978). Early Triassic Ich-thyosaurus, Utatsusaurus hataii gen. et sp. nov., from the Ki- takami Massif, Northeast Japan, Tohoku Univ., Sci. Rept., 2nd ser., Geol., 48, 77-97.
Sollas W.J. (1916). The skull of Icthyosaurus studied in serial sections. Phil. Trans. Roy. Soc., Lond. (B), 208, 63-126.
Sues H.-D. (1987). On the skull of Placodus gigas and the rela-tionships of the Placodontia. Jour. Vert. Paleont., 7, 138-144.
Sues H.-D. (1987). The postcranial skeleton of Pistosaurus and the interrelationships of the Sauropterygia (Diapsida). Zool. Jour. Linn. Soc., 90, 109-131.
Tarlo L. B. (1958). The scapula of Pliosaurus macromerus Phil-lips. Paleontology, 1, 193-199.
Watson D. M. S. (1924). The elasmosaurid shoulder girdle and forelimb. Proc. Zool. Soc. Lond., 885-917.
Webb P.