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Nightjars, noise made by some male, with their wings; elongated feathers in. Nilghau, sexual differences of colour in the. Nilsson, Prof., on the resemblance of stone arrow-heads from various places; on the development of the horns of the reindeer. Nipples, absence of, in Monotremata. Nitsche, Dr., ear of foetal orang. Nitzsch, C.L., on the down of birds. Noctuae, brightly-coloured beneath.
Smitt and Dr. Nitsche naturalists who have carefully studied this group to be homologous with the zooids and their cells which compose the zoophyte, the movable lip or lid of the cell corresponding with the lower and movable mandible of the avicularium. Mr. Busk, however, does not know of any gradations now existing between a zooid and an avicularium.
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