A manual of zoology for the use of students : with a general introduction on the principles of zoology / by Henry Alleyne Nicholson.

Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: A manual of zoology for the use of students : with a general introduction on the principles of zoology / by Henry Alleyne Nicholson. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Ma.xill.33 (Lat. jaws). The inferior pair or pairs of jaws in the Arthropoda (Insects, Crustacea, &c.) The upper jaw-bones of Vertebrates. Maxillipedes (Lat. maxillae, jaws ; pes, the foot). The limbs in Crustacea and Myriapoda which are converted into masticatory organs, and are com- monly called foot-jaws. Medulla (Lat. marrow). Applied to the marrow of bones, or to the spinal cord, with or without the adjective spinalis. Medusae. An order of Hydrozoa, commonly known as Jelly-fishes (Disco- phora, or Acalephce), so called because of the resemblance of their tentacles to the snaky hair of the Medusa. Many Medusce are now known to be merely the gonophores of Hydrozoa. Medusiform. Resembling a Medusa in shape. Medusoid. Like a Medusa; used substantively to designate the medusiform gonophores of the Hydrozoa. Membrana nictitans (Lat. nicto, I wink). The third eyelid of Birds, &c. Mentum (Lat. the chin). The basal portion of the labium or lower lip in Insects. Mbrostomata (Gr. meron, thigh ; stoma, mouth). An order of Crustacea in which the appendages which are placed round the mouth, and which offi- ciate as jaws, have their free extremities developed into walking or pre- hensile organs. Mesenteries (Gr. mesos, intermediate; enteron, intestine). In a restricted sense, the vertical plates which divide the somatic cavity of a Sea-anemone (Actinia) into chambers. Mesopodium (Gr. mesos, middle ; pons, foot). The middle portion of the foot of Molluscs. Mesosternum (Gr. mesos, intermediate ; sternon, the breast-bone). The middle portion of the sternum, intervening between the attachment of the second pair of ribs and the xiphoid cartilage (xiphisternum). Mesothorax (Gr. mesos; and thorax, the chest). The middle ring of the thorax in Insects. Mesozoic (Gr. mesos; and zoe, life). The Secondary period in Geology. Metacarpus (Gr. mete, after; karpos, the wrist). The bones which form the root of the hand, and intervene between the wrist and the fingers. Metamorphosis (Gr. meta, implying change; morphe, shape). The changes of form which certain animals undergo in passing from their younger to their fully-grown condition. Metapodium (Gr. meta, after ; pous, the foot). The posterior lobe of the foot in Mollusca; often called the operculigerous lobe, because it deve- lops the operculum when this structure is present. Metastoma (Gr. meta, after ; stoma, mouth). The plate which closes the mouth posteriorly in the Crustacea. Metatarsus (Gr. meta, after; tarsos, the instep). The bones which inter- vene between the bones of the ankle (tarsus) and the digits in the hind-foot of the higher Vertebrates. Metathorax (Gr. meta, after ; thorax, the chest). The posterior ring of the thorax in Insects. Mimetic (Gr. mimetihos, imitative). Applied to organs or animals which re- semble each other in external appearance, but not in essential structure. Molars (Lat. mola, a mill). The grinders in man, or the teeth in diphyo- dont Mammals which are not preceded by milk-teeth. Mollusca (Lat. mollis, soft). The sub-kingdom which includes the Shell- fish proper, the Polyzoa, the Tunicata, and the Lamp-shells ; so called from the generally soft nature of their bodies. Molluscoida (Mollusca ; Gr. eidos, form). The lower division of the Mollusca, comprising the Polyzoa, Tunicata, and Brachiopoda. Monads (Gr. monas, unity). Microscopical organisms of an extremely simple character, developed in organic infusions. Monoculous. Possessed of only one eye. Monodelphia (Gr. monos, single ; delphus, womb). The division of Mamma lia in which the uterus is single.