GLOSSAEY 



OF ANATOMICAL AND OTHER SCIENTIFIC TEKMS USED IN THESE 

 LECTURES. 



Abdomen. (Lat. abdo, I conceal.) The posterior and principal cavity containing 



the bowels and many other viscera of the animal. The abdomen is distinct from 



the thorax in crustaceans, spiders, and insects. 

 Abdominales. (Lat. abdomen.^ An order of fishes, so called from the attachment 



of the ventral fins to the abdomen behind the pectorals. 

 Aberrant. (Lat. aberro, I wander from.) This term is applied to those species 



which deviate most from the type of their natural group. 

 Abranchiate. (Gr. a, without; hragchia, gills.) When an animal is devoid of 



gills. 

 AcALEPHA. (Gr. akalephe, a nettle.) The class of radiated animals with soft 



skins, which have the property of stinging like a nettle. 

 AcANTHOCEPHALA. ( Gr. alicmtkos, a spine; kephale, a head.) The order of intes- 

 tinal worms having the head armed with spines or hooks. 

 AcARus. (Gr. akari, a mite.) The name of a genus of Arachnida, to which the 



cheese-mite and allied spacies belong. 

 AcARiDiE. The family of which the genus Acarus is the type, 



AcASTA. (Gr. akaste.) A name arbitrarily applied to a genus of Barnacles, para- 

 sitic upon sponges. 

 Acephalous. (Gr. a, without; kephale, head.) Headless. The animals in which 



a distinct head is never developed. 

 AcEPHALocYST. The parasitic hydatid, which consists of a cyst or bag without a 



head. 

 AcETABULA. (Lat. acetabulum, a shallow cup.) The fleshy sucking-cups with 



which many of the invertebrate animals are provided. 

 Acini. (Lat. acinum, a berry.) The secerning parts of glands, when they are 



suspended like grains or small berries to a slender stem. 

 Acoustic. (Gr. akouo, I hear.) Appertaining to sound, or the organ of hearing. 

 AcRiTA. (Gr. akritos, confused.) A term applied to the lowest animals, in which 



the organs, and especially the nervous system, were supposed to be confusedly 



blended with the other tissues. 

 Actinia. (Gr. akti7i, a ray.) The genus of Polypes, which have many arms 



radiating from around the mouth. 

 AcTiNocEROs. (Gr. aktin, a ray; keras, a horn.) A generic term, signifying the 



radiated disposition of the horns or feelers. 

 Adipose. (Lat. adeps, fat.) Fatty. 

 Akera. (Gr, a, without ; ker as, a horn.) The family of Mollusca, without horns 



or feelers. 

 Alar, (Lat. ala, a wing.) Belonging to a wing. 



Albuminous. (Lat. albumen, white of egg. ) Consisting of albumen, or the sub- 

 stance which forms the white of an egg. 

 Aliform. Shaped like a wing. 

 Alula. A little wing. 

 Ambulacra. (Lat. ambulacrum, an avenue or place for walking.) The perforated 



series of plates in the shell of the sea-star or sea-urchin. 

 Ambulatory. (Lat. ambtdo, I walk.) An animal or a limb made for walking. 

 Ammonites. An extinct genus of Mollusca, allied to the Nautilus, which inhabited 



a chambered shell, called Ammonite from its resemblance to the horns on the statues 



of Jupiter Amnion. 

 Amorphous. (Gr. a, without; morpJte, form.) Bodies devoid of regular form. 

 Amphipods. (Gr. ainphi, on both sides; pous, a foot.) The order of Crustacea, 



which have feet for both walking and swimming. 



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