Pedicels occur sterile appendages consisting of slender stalks, terminating in distal expansions, which form a fleshy covering over the surface of the flower, leaving small apertures immediately above the micropyles for the entrance of the pollen-grains.
Sp.a, Section through sterile segPeltate expansions of sporanments.
To the extreme development of the carapace in Laura, as compared with the segmented body, it would be difficult to find among crustaceans any analogy more striking than that of the great ovarial expansions in Nicothoe astaci, the little copepod parasite of the common lobster.
The wings of Hexapoda are lateral expansions of the terga of the second and third thoracic somites.
The value of a is in general small, and an approximate solution may be obtained by substituting two or three terms of the expansions for sin a and cos a.