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. II.

OPHREÆ—continued.

genus Ophrys differs from Orchis chiefly in having separate pouch-formed rostella, instead of the two being confluent.

In Ophrys muscifera, or the Fly Ophrys, the chief peculiarity is that the caudicle of the pollinium (B, fig. 5) is doubly bent. The nearly circular piece of membrane, to the under side of which the ball of viscid matter adheres, is of considerable size, and forms the summit of the rostellum. It is thus freely exposed