INVERTEBRATES FROM THE FALUNS OF TOURAINE (Crustaceans)

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N°	Description	Genus	Species	Family	Origin
1	acorn-fish fixed on pebble	Megabalanus (?)	tintinnabulum (?)	Balanidae	Channay
2	colony of acorn-fishes	Megabalanus (?)	tintinnabulum (?)	Balanidae	region of Savigné
3	acorn-fish	Megabalanus (?)	tintinnabulum (?)	Balanidae	region of Savigné

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In spite of their immobility, acorn-fishes are crustaceans in the same way as crabs or shrimps. On all the samples presented here, the two triangular plaques, which permit the animal to shut itself completely into its shell, miss. According to René-Pierre Carriol, "attaché honoraire au Muséum national d'Histoire naturelle", who has agreed to express his opinion on these specimens and whom I thank here, the absence of these triangular plaques (or opercular valves) does not allow to determine exactly these acorn-fishes, so the interrogation marks for these species, classically admitted into the faluns.