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f or pertaining to the Trematodea. See Illustration in Appendix.

system of veins, as in the wing of an insect, or in the leaves of a plant. See Illust. in Appendix.

open sea. Its form is due to the enormous development of two spheromeres. See Illust. in Appendix. -- Venus's hair (Bot.), a delicate and graceful fern (Adiantum Capillus-Veneris) having a slender, black and shining stem and branches. -- Venus's hair stone (Min.), quartz penetrated by acicular crystals of rutile. -…

The external male organ of certain mollusks, worms, etc. See Illustration in Appendix.

rm in form or motions; vermicular; as, the vermiform process of the cerebellum. Vermiform appendix (Anat.), a slender blind process of the cæcum in man and some other animals; -- called also vermiform appendage, and vermiform process. Small solid bodies, such as grape seeds or cherry stones, sometimes lodge in it, caus…

s species of small Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structure of the chemical…

, called also Jack curlew, half curlew, stone curlew, and tang whaup. See Illustration in Appendix. Hudsonian or, Eskimo, whimbreal, the Hudsonian curlew.

hat the after mast is very small, and stepped as far aft as possible. See Illustration in Appendix.

s in many turbellarians, and in some other invertebrates. See Illust. of Hermaphrodite in Appendix. -- Yolk sack (Anat.), the umbilical vesicle. See under Unbilical.