caption: The image shows a group of five different types of conch shells on a black background, with the text "Cancellaria trigonostoma agassizii dall, 1889" at the top. The shells are arranged in a symmetrical pattern, with each one having a unique shape and texture. The colors of the shells range from light brown to dark brown, with some having a glossy finish. The text is written in a bold, white font, making it stand out against the dark background.