GLOSSARY 



325 



blastoderm, bias* to derm (Gr. blastos, a bud ; derma, skin), the layer of cells 



forming the wall of the blastula. 

 blastomere, bias 1 to mer (Gr. blastos, a bud ; meros, a part) , a term applied to 



a cell during cleavage of the egg. 

 blastopore, bias' to por (Gr. blaslos, a bud ; poros, pore), the opening of the 



gastrula, the primitive mouth, 

 blastula, bias' til Id (dim. of Gr. blastos, a bud), an embryo consisting of a sac 



formed of a single layer of cells. 



botany, bot'a ni (Gr. botane, a plant), the science which treats of plants. 

 branchial, branchial (L. branchiae, gills), pertaining to the gills, 

 buccal, buk'al (L. bucca, a cheek), pertaining to the cheek or mouth. 



Cambarus, kam'ba rus (L. camarus, a sea crab), a genus of crayfishes. 



capillary, kap'i 13, ri (L. capillus, hair), a hairlike tube. 



carapace, kar'a pas (Gr. karabos, a crustaceous animal like the crab), the 



shield covering the cephalothorax of the crayfish. 

 carbohydrate, kar bo hi 1 drat (L. carbo, a coal ; Gr. hudor, water), an 



organic body containing 6 carbon atoms or some multiple of 6, and 



hydrogen and oxygen in the proportion in which they form water (H^O). 

 cardiac, kdr'di ak (Gr. kardia, the heart), pertaining to the heart, 

 caudal, kd'dal (L. cauda, a tail), having a position or relation toward the 



tail when compared with some other part. 

 Cell, set (L. cella, a store-room), a mass of protoplasm containing a nucleus ; 



the unit of structure of the Metazoa. 

 centrosome, senffrosom (Gr. centron, center; soma, body), a body found 



at the center of the aster of the amphiaster during mitotic cell division. 

 Cephalic, sefdfik (Gr. kephale, the head), having a position or relation 



toward the head when compared with some other part, 

 cephalothorax, sefa Id tho'raks (Gr. kaphale, the head ; thorax, the thorax), 



the (coalesced) head and thorax of certain arthropods, 

 cervical, ser'vi kal (L. cervix, the neck), of or pertaining to the neck. 

 Chela, ke'ld (Gr. kele, a claw), the pair of pinchers that terminates some of 



the appendages of certain crustaceans. 

 cheliped, ke'liped (Gr. kele,*. claw; L. pes, foot), the chelate walking legs 



of the crayfish and other crustaceans. 

 Chemotropism, kern ot'ro pism (Gr. chemeia, a mingling; trope, a turning), 



the reaction of an animal to a chemical, 

 chitin, kit tin (Gr. chiton, a coat of mail), the organic substance forming the 



exoskeleton of arthropods and certain other animals. 

 ChlorogOgen, kid' r 5 go' j en (Gr. chloros, grass-green), (see p. 169). 

 Chlorophyll, klo'rojil (Gr. chloros, grass-green : phullon, a leaf), the green 



coloring matter of plants. 



