...—When wings are folded, it will be helpful to remember thatthickened fore or cover wings always have membranous wings folded beneaththem... 
Worrallo Whitney 「A Guide for the Study of Animals」
...
Per i car' di um, a membranous bag surrounding the heart...
Worrallo Whitney 「A Guide for the Study of Animals」
...Valve, (1) a membranous fold which allows the blood, or other fluids, to flowin only one direction; (2) one of the two parts of the shell of a bivalve...
Worrallo Whitney 「A Guide for the Study of Animals」
...By this character they may at once be known from flies, which have only two membranous wings...
Edward Saunders 「Wild Bees, Wasps and Ants」
...In severe cases membranous (croupous) deposits are found in thethroat...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Pericardial diaphragm: a delicate membranous tissueattached to the ventral surface of the heart and laterally to thebody wall := dorsal diaphragm wings of the heart...
John. B. Smith 「Explanation of Terms Used in Entomology」
...The labium, whichis divided into three joints, becomes flattened towards the tip, whichis square, and ends in two thin membranous lobes, probably endowed witha slight sense of touch...
Alpheus Spring Packard 「Our Common Insects」
...These two appendages are able, by means of a mechanismrecalling, on a smaller scale, that of the Snail's horns, to withdrawinto themselves, as a result of the membranous character of theirbase...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...The skull develops in the same way as the membranous vertebral column...
Ernst Haeckel 「The Evolution of Man」
...177: Rudiment of flying membrane, membranous fold between foreand hind leg...
Ernst Haeckel 「The Evolution of Man」
...At thispoint a soft membranous (partly turning into cartilage), small skull-capsule isformed, and encloses the brain...
Ernst Haeckel 「The Evolution of Man」
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