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GLOSSARY. 



differing in size or shape from 

 the other, as in the oyster or 

 Bracbiopod shells. 

 Ir'ro-ra-ted. Freckled ; sprin- 

 kled with atoms. 



Lamb doi'dal. Referring to the 

 lambdoidal or //-shaped suture, 

 with the apex upward, in a 

 mammal's skull. 



Lam-el-li-bran'chi a ta (Lat. 

 lamella, a leaf or sheet ; bran- 

 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. 



Ltjm'bar (Lat. lumbus, a loin). 

 Connected with the loins. 



Lu'men. The cavity of an organ. 



Ma-li'pe-bes. The fourth and 

 fifth pairs of head-appendages 

 of chilopod Myriopods. 



Me-ddl'la (marrow). The spinal 

 cord of vertebrates. 



Men'tum (chin). The basal 

 piece or sclerite of the labium 

 or second maxillae 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, 

 embr3'onic mesoderm. 



Me-tag'e ne-sis. Alternation of 

 generations. 



Me'ta-mere. The same as som- 

 ite or arthromere. 



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. murios, thou- 

 sand ; pous, podos, foot). The 

 class of tracheates comprising 

 the Millepedes and Centipedes. 



Ne-mat'o-cyst (Gr. nema, a 

 thread ; kustis, a bladder). 

 The nettling, stinging organs 

 or thread-cells or lasso-cells of 

 the jelly-fishes and polyps, 

 etc. 



Ne-phrid'ia (Gr. nephros, 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. 



O-don'to-phore ( Gr. odous, a 

 tooth ; phero, I carry). The 

 so-called tongue or lingual 

 ribbon of the higher mol- 

 lusks. 



