Archive image from page 718 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 the animal can leap pretty actively. It is secu- riform when its free edge is arched like the cutting face of an axe, as in Petuncttlus, (a, Jig. 358). When it presents this form its edge Fig. 358. is generally divided into two lips, which, being separated, present with some degree of ac- curacy, although much contracted, the sem- blance of the locomotive plane of certain Gas- teropoda. When this structure occurs, the Fig. 359.

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