(Examples, grasses, lilies, orchids,
palms, etc.)
MORAINES.--The accumulations of fragments of rock brought down by glaciers.
MORPHOLOGY.--The law of form or structure independent of function.
MYSIS-STAGE.--A stage in the development of certain crustaceans (prawns),
in which they closely resemble the adults of a genus (Mysis) belonging to a
slightly lower group.
NASCENT.--Commencing development.
NATATORY.--Adapted for the purpose of swimming.
NAUPLIUS-FORM.--The earliest stage in the development of many Crustacea,
especially belonging to the lower groups. In this stage the animal has a
short body, with indistinct indications of a division into segments, and
three pairs of fringed limbs. This form of the common fresh-water CYCLOPS
was described as a distinct genus under the name of NAUPLIUS.
NEURATION.--The arrangement of the veins or nervures in the wings of
insects.
NEUTERS.--Imperfectly developed females of certain social insects (such as
ants and bees), which perform all the labours of the community. Hence,
they are also called WORKERS.
NICTITATING MEMBRANE.--A semi-transparent membrane, which can be drawn
across the eye in birds and reptiles, either to moderate the effects of a
strong light or to sweep particles of dust, etc., from the surface of the
eye.
OCELLI.--The simple eyes or stemmata of insects, usually situated on the
crown of the head between the great compound eyes.
Pages:
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801