GLOSSARY. 



691 



in the chelate maxilla of the 

 scorpion. 



CHI-AS'MA (Gr. chiasma, a cross- 

 ing). The commissure of the 

 optic nerves in most verte- 

 brates. 



CHI'TIN (Gr. chiton, a tunic). The 

 horny substance in the skin of 

 insects, etc. 



CHYLE (Gr. chulos, juice). The 

 milky lluid resulting from the 

 action of the digestive fluids on 

 the food or chyme. 



CHYME (Gr. chumos, juice). The 

 acid, partly fluid or partly 

 digested food, produced by 

 the action of the gastric juice 

 on the food. 



CIL'I UM (pi. cilia). Microscopic 

 filaments attached to cells, 

 usually within the body, and 

 moving usually rhythmical- 



iy. 



CIR RUS. A slender process on 

 the body of worms. 



CLO'A-CA (Lat. a sewer). The 

 common duct or passage at the 

 end of the intestine into which 

 the oviducts and urinary ducts 

 open, as in reptiles, birds, and 

 monotreme mammals. 



CCE'CAL. Ending blindly or in a 

 cul-de sac. 



CCE'CUM. A blind sac; usually 

 applied to one or more append- 

 ages of the digestive canal. 



CCE-NEN'CHY-MA (Gr. Jcoinos, com- 

 mon; cltumon, chyme or juice). 

 Applied in polyps to the coral 

 mass containing the chymifer- 

 ous or nutritive canals connect- 

 ing the different polyps. 



COL'LO-PHORE. The sucker-like 

 organ extended from the under- 



side of the abdomen of Podu- 

 rans. 



COM-MIS'SURE. The nerves con- 

 necting two ganglia. 



CON COL'O ROUS. Of the same 

 color as another part. 



CON'DYLE (Gr. kondulos, a 

 knuckle). The articular sur- 

 face of a bone, especially of 

 the occiput. 



COR'TI CAL. Relating to the cor- 

 tex or inner skin; external, as 

 opposed to medullary. 



COS'TAL (Lat. costa, a rib). Re- 

 lating to the ribs. 



CRIB'RI FORM (Lat. cribrum, a 

 sieve ; forma, form). With 

 perforations like those of a 

 sieve. 



CROP. A partial dilatation of 

 the gullet or oesophagus, the 

 ingluvies ; in many insects the 

 fore stomach or proveutricu- 

 lus. 



CU'TI-CLE. The outermost layer 

 of the integument. 



DE-CID'U-OUS. Relating to parts 

 which fall off or are shed dur- 

 ing life, as the gills of the 

 frog, etc. 



DEN'TATE. Furnished with 

 teeth. 



DEI;M'A-TOP-TE-RA (Gr. derma, 

 skin; pteron, wing). The ear- 

 wigs. 



DEU-TOM'A-LJE. The third pair 

 of head appendages of Myri- 

 opoda. 



DI-DEL'PHI-A (Gr. dis, two, or 

 double; delphus, womb). The 

 sub-class of Marsupials. 



DIF FER-EN-TI-A'TION. The spec- 

 ialization or setting apart of 



