374 GLOSSARY. 



Amphistoma. (Gr. arnphi ; stoma, a mouth.) The genus of suctorial parasitic 



worms, which have pores like mouths at both ends of the body. 

 Ampulla. (Lat. a bottle.) A membranous bag, shaped like a leathern bottle. 

 Anaima. (Gr. a, without; aima, blood.) The name given by Aristotle to the 



animals which have no red blood, and which he supposed to be without blood. 

 Analogue. A part or organ in one animal which has the same function as another 



part or organ in a different animal. See Homologue. 

 Anastomose. ( Gr. ana, through ; stoma, mouth. ) When the mouths of two 



vessels come into contact and blend together, or when two vessels unite as if such 



kind of union had taken place. 

 Androgynous. ( Gr. aner, a man ; gune, a woman. ) The combination of male 



and female parts in the same individual, 

 Anellata. (Lat. annellus, a little ring.) The worms in which the body seems to 



be composed of a succession of little rings, characterised by their red blood. 

 Anellide. The anglicised singular of Aiiellata. 

 Anenterous. (Gr. a, without; enteron, a bowel.) The animalcules of infusions 



which have no intestinal canal. 

 Annulated. (Lat. annulus, a ring.) When an animal or part appears to be com- 

 posed of a succession of rings. 

 Anourous. (Gr. a, without ; aura, a tail.) Tail-less. 

 Antenna. (From the Latin for yard-arm.) Applied to the jointed feelers or 



horns upon the heads of insects and Crustacea, and sometimes to the analogous 



parts, which are not jointed in worms and other animals. 

 Anthozoa. (Gr. anthos, a flower; zoon, an animal.) The class of Polypes, 



including the actinia and allied species, commonly called animal-flowers. 

 Antiperistaltic. ( Gr. anti, against ; and peristaltic. ) When the vermicular con- 

 tractions of a muscular tube follow each other in a direction the reverse of the 



ordinary one. 

 Antlia. ( From the Latin for pump. ) Restrictively applied to the spiral instrument 



of the mouth of butterflies and allied insects, by which they pump up the juices 



of plants. 

 Aorta. (Gr. aorte, the wind-pipe; and also the name of the great vessel springing 



from the heart, which is the trunk of the systemic arteries. ) It is exclusively applied 



in the latter sense in modern anatomy, 

 Aphidian. Belonging to the insect called aphis, or plant-louse. 

 Apical. (Lat. apex, the top of a cone.) Belonging to the pointed end of a cone- 

 shaped body. 

 Apodal. (Gr. a, without; poda, feet.) Footless; without feet or locomotive 



organs : fishes are so called which have no ventral fins. 

 Apterous. (Gr. a, without; pteron, a \vmg.) Wingless species of Insects or Birds. 

 Arachnida. (Gr. arachne, a spider.) Spiders, and the animals allied to them in 



structure. 

 Arborescent. (Lat. arbor, a tree.) Branched like a tree. 

 Arthrodial. (Gr. arthron, a joint.) It is restricted to that form of joint in 



which a ball is received into a shallow cup. 

 Articulata. (Lat. articulus, a joint. ) Animals with external jointed skeletons or 



jointed limbs. 

 AsciDiAN. (Gr. as^os, a bottle, ) The shell- less acephalous MoUusks, which are 



shaped like a leathern bottle. 

 Automatic, (Gr. automates, self-moving.) A movement in a living body without 



the intervention or excitement of the will. 

 Axilla (from the Latin for armpit) ; and applied to other parts of the animal body 



which form a similar angle. 

 AzYGOS. (Gr. a, without; zugos, yoke.) Single, without fellow. 



Baculite. Ah extinct genus of molluscous animals allied to the Nautilus, which 

 inhabited a straight-chambered shell, resembling a staff; whence the name of the 

 genus, from haculus, a staff. 



Balanoids. (Gr. halanos, an acorn.) A family of sessile Cirripeds, the shells of 

 which are commonly called acorn-shells. 



Basilar. (Lat. basis, a base.) Belonging to the base of the skull. 



