| A special sense-organ, such as the flabellum of Limulus or the pecten of scorpion, remains and gives rise to the auditory organ. |
| The heavily pigmented, pleated pecten was identified in the ventrolateral aspect of the fundus, protruding into the vitreous. |
| Found on pecten shells, and abundant off the coast of Maine. |
| Thus a Crepidula on a pecten shell will be ribbed while the same species on a stone will be perfectly smooth. |
| On this day however a new structure appears, which remains permanently through life, and is known as the pecten. |
| The proximal part of the free edge of the pecten is somewhat swollen, and sections through this part have a club-shaped form. |
