GLOSSARY. 
319 
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 fluid resulting from the 
action of the digestive fluids on 
the food or chyme. 
Chyme (Gr. cJiumos, 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- 
ly. 
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. koinos, com- 
mon; chumos, 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 ejcteu(iec! 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 oi 
the occiput. 
CoR Ti CAL. Relating to the cor- 
tex or inner skin; external, asr 
opposed to medullary. 
Cos'tal (Lat costa, a rib). Re 
lating to the ribs. 
Crib'ri form (Lat. cnhrum, 9 
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 proventricu- 
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. 
Derm'a-top-te-ra (Gr. derma, 
skin; pteron, wing). The ear- 
wigs. 
Deu-tom'a-l^. 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. 
Pif-fer-en-ti-a'tion. The spec- 
ialization or setting apart of 
