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Hélix Bilamellata, G. Sowerby. Testâ orbiculato-depressâ, spirâ planâ, anfractibus senis, ultimo subtus ventricoso, superne angulari; umbilico parvo; aperturâ semilunari, superne extus angulatâ, labio externo tenui; interno plicis duabus spiralibus, posticâ majori: long, 0,15, lat. 0,33, poll.
Cerithium Aemulum, G. Sowerby. Testâ oblongo-turritâ, subventricosâ, apice subulato, anfractibus decem leviter spiraliter striatis, primis serie unicâ tuberculorum instructis, intermediis irregulariter obsolete tuberculiferis, ultimo longe majori absque tuberculis, sulcis duobus fere basalibus instructo: labii externi margine interno intùs crenulato: long. 1,8; lat. 0,7, poll.
Testâ orbiculato-depressâ, anfractibus quinque rotundatis, striatis; aperturâ semilunari, labio interno, plicis duobus spiralibus, posticâ majori; umbilico magno; long. 0,04, lat. 0,1, poll.
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