caption: The image shows three white conch shells from the Mangilia Evadne Dall, 1919 USNM 211334 Holotype, set against a black background. The shells are arranged in a triangular formation, with the largest shell in the center and two smaller shells on either side. The text at the top of the image reads "Mangilia evadne dall 1919 USMM 211334 holotype".