322 
GLOSSARY, 
differing in size or sliape from 
the oilier, as in llie oyster or 
Bracliiopod shells. 
Ir'ro-ra-ted. Freckled ; sprin- 
kled with atoms. 
Lamb doi'dal. Referring to the 
lainbdoidal or y4-shaped suture, 
with the apex upward, in a 
mammal's skull. 
Lam EL-LI BKAN CHI A TA (Lat. 
lamella, a leaf or sheet ; b7'((n- 
chia, gill). A class of mollusks 
with large leaf-like gills. 
Lar'va (Lat. larva, a mask). 
The second stage of the insect, 
a caterpillar, grub, or mag- 
got. 
Lum'bar (Lat. lumhus, a loin). 
Connected with the loins. 
Lu'men. The cavity of an organ. 
Ma-li'pe DES. The fourth and 
fifth pairs of head-nppendnges 
of chilopod Myriopods. 
Me-dul'la (marrow). The spinal 
cord of vertebrates. 
Men'tum (chin). The basal 
piece or sclerite of the labium 
or second maxillse of insects. 
Submentum is the posterior 
division of the mentum. 
Mes-en'te-ron. The mid-gut or 
stomach. 
Mes'en-te RY (Gr. mesos, inter- 
mediate ; enteron, intestine). 
The membrane between the in- 
testine and abdominal walls. 
Me'so-blast. The primitive, 
embryonic mesoderm. 
Me-tag'e ne-sis. Alternation of 
generations. 
Me'ta-mere. The same as som- 
ite or t^rtUrom^i'^, 
Mon-ce'ci-ous (Gr. monos, single; 
oikos, house). With the sexual 
glands, etc., united in the same 
individual. 
My'o-blast. The embryonic 
cells which become muscle 
cells. 
Myr-i-op'o-da (Gr. mun'os, thou- 
sand ; pons, podos, foot). The 
class of tracheates comprising 
the Millepedes and Centipedes. 
Ne-mat'o-cyst (Gr. nema, a 
thread ; kustis, a bladder). 
The nettling, slinging organs 
or thread-cells or lasso-cells of 
the jelly-fishes and polyps, 
etc. 
Ne-phrtd'i A (Gr. nephi'os, kid- 
ney). The segmental organs 
of worms, etc. 
Neu-rop'te-ra (Gr. neuron, 
nerve; pteron, wing). The 
order of net-veined insects with 
a complete metamorphosis. 
NiD-A-MEN TAL. Referring to a 
nest, or egg-sac. 
No' TO CORD (Gr. noton, back ; 
chorde, a string), or chorda 
dorsalis. The primitive sup- 
port of the body of vertebrate 
embryos, larval ascidians, and 
the backbone of the lancelet 
and lampreys. 
Ob'tec-ted. Covered ; con- 
cealed. 
O'do-na-ta (Gr. odous, teeth). 
The dragon flies. 
0-don'to-phore ( Gr. odous, a 
tooth ; phero, I carry). The 
so-called tongue or lingual 
ribbon of the higher mo}, 
lusks. 
