DEVRIèS, ANDRé - Une anomalie de symétrie chez Holaster algirus (Coq. sp.) Péron 1866. /&/ A propos de la symétrie des echinides.

1953. Publ. Serv. Carte Géol. de l'Algérie Bull. No. 1, fasc. II; pp. 85-90, 1 plt. /&/ pp. 91-128, 6 fig. 5 plts. Orig. extract, plain new wrps. as such very good.

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