GLOSSARY. 1G1 



Bivalve (Lat. Iris, twice; valvce, folding doors) Applied to the 

 shells of the Lamellibranchiata and Bracltiopoda, which are 

 composed of two pieces. 



Brachiopoda (Gr. brachion, an arm; pous, a foot) A class of 



Molluscoida, having long ciliated arms, and bivalve shells. 

 i/Branchiae (Gr. branchice, gills) The breathing organs of fish and 

 other aquatic animals. 



Branchiogasteropoda (Gr. branchke, gills ; gaster, the belly ; pous, a 

 foot) A group of Gasteropoda that breathe by means of grills. 

 ^ Bronchi (Gr. bronchos, the windpipe) The branches of the wind- 

 pipe that permeate the lungs. 



Bryozoa (Gr. bruon, moss; zoon, an animal) Another name for 

 the Polyzoa. 



Byssus (Gr. bussos, flax) Silky threads by which the mussel and 

 other lamettibranchs attach themselves to rocks. 



Caeca Blind processes in the alimentary canal. 

 ^Canine Teeth (Lat. canis, a dog) The eye teeth, so called because 

 they are. well developed in the dog and other carnivorous 

 animals. 

 Carapace The upper shell of crabs and lobsters ; the upper half 



of the case in which tortoises and turtles are enclosed. 

 ^-Carpus (Gr. carpos, the wrist) The bones that are placed be- 

 tween the fore-arm and the hand. 

 ^-Caudal (Lat. cauda, the tail) Belonging to the tail. 

 Cephalopoda (Gr. Jcephale, the head ; pous, foot) A class of Mol- 

 lusca, to which the cuttle-fish and nautilus belong. They 

 are so called because the organs of locomotion are arranged 

 round the head. 



Cephalothorax (Gr. kephak, the head; thorax, breast) That part 

 of the body in Crustacea and Arachnida which is formed 

 by the tmion of the head and thorax. 

 fc Cervical (Lat. cervix, the neck) Belonging to the neck. 

 Chsetognatha (Gr. chaite, hair; ynathos, a jaw) A class of Anar- 



thropoda, containing the Sagitta only. 

 Chitine (Gr. chiton, a coat) The horny substance which forms 



the exoskeleton of insects, &c. 

 Chrysalis (Gr. chrusos, gold) The pupa state of an insect, so 



called because it is sometimes of a golden colour. 

 V- Chyle (Gr. chulos, juice) The milky fluid which results from the 



digestion of food. 

 ^ Chyme (Gr. chumos, juice) The pulpy mass into which food is 



formed by the action of the gastric juice. 



i Cilia (Lat. cilium, an eye-lash) Microscopic hair-like organs 

 which, by their movements, produce currents in the water, 

 and thus supply the Infusoria and other animals with minute 

 particles of food. They also serve as means of locomotion. 



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