GLOSSARY. 



695 



CE-soph'a-gus (Gr. oisos, a reed ; 

 pMgein, to eat). The gullet. 



ON-TOG'E-NT(Gr. on, ontos, being; 

 gene, birth). The development 

 from the egg, of an individual 

 animal. 



O-PEK'cu-LtrM (Lat. operio, to 

 cover). In fishes one or more 

 bones covering the gills ; in 

 Gastropod moUusks a horny- 

 plate or solid limestone mass 

 closing the orifice of shells. 



O-pis-tho-cos'lous (Gr. opisthen, 

 behind ; kmlos, hollow). Those 

 vertebrates with bodies hollow 

 behind and convex in front. 



O'ral. Related to the mouth. 



Or-ni-tho-dbl'ph i-a (Gr. ornis, 

 bird ; delphua, womb). The 

 sub class of mammals and or 

 der Monotremaia. 



Orthop'te-ra (Gr. orthos, 

 straight ; pteron, wing). The 

 order of insects wilh straight 

 narrow fore- wings, as the grass- 

 hoppers. 



Os-tra'co-da (Gr. ostracodea, 

 shelled). A group of shelled 

 Crustacea. 



O'to-liths (Gr. ous, ear ; lithos, 

 stone). Small bones suspended 

 in the internal ear of fishes, or 

 concretions in the auditory 

 sacs of Invertebrates. 



O-vip'a-rous (Lat. mum, an egg; 

 pario, I bring forth). Applied 

 to animals bringing forth eggs 

 instead of living, active young. 



0-vi-POs'i TOR (Lat. ovum, an 

 egg; potio, I place). An organ 

 in insects homologous with the 

 sting, by which eggs are de- 

 posited in solid substances. 



O'ti-sac. a sac or bag -like mem- 



brane attached to the parent, 

 and containing eggs. 

 0-vo-vi-vip'a-rous (Lat. mum, 

 an egg; vivus, alive; pario, I 

 bring forth). Applied to such 

 animals as retain their eggs in 

 the body until they are hatched. 



P.* DO gbn'e-sis. Parthenoge- 

 nous development in larval in- 

 sects. 



Pal'li-um: (Lat. a cloak). The 

 mantle or body-wall of niol- 

 lusks, which secretes the shell ; 

 adj. pallial. 



Papilla. A minute soft projec- 

 tion. 



Pa-ren'chy-ma (Gr. paregchuma, 

 ivovapara, en, chuo, something 

 poured in besides). Applied 

 to the proper substance of vis- 

 cera, excluding connective tis- 

 sue, blood-vessels, and other 

 accessory parts. - 



Pae-the-no gen'e-sis (Gr. pa/r- 

 tlienoa, virgin; genesis, genera- 

 tion). Reproduction by direct 

 growth of germs from the egg, 

 without fertilization by male 

 germs or spermatozoa, as in the 

 aphis, gall-insects, lluke-worm, 

 etc. 



Pel'a Gic. Living on the high 

 seas, away from the coast; in 

 mid-ocean. 



Pbr'i-somb (Gr. peri, around; 

 soma, body). In Crinoids the 

 oral region of the cup or body. 



Pe rbn-ni-bran'chi-a-ta (Lat. 

 perennis, perennial : branchia, 

 gill). Those Batrachia which re- 

 tain their gills throughout life. 



Per-is-so-dac'tt-la (Gr. perisaos, 

 uneven; dakty,los, finger). 



