O LOSS ART. 



695 



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

 phagein, to eat). The gullet. 



On-tog'b-nt (Gr. on, ontoa, being; 

 gene, birth). The development 

 from the egg, of an individual 

 animal. 



O-pbk'cu-ltim (Lat. opeirio, to 

 cover). In fishes one or more 

 bones covering the gills ; in 

 Gastropod mollusks a horny- 

 plate or solid limestone mass 

 closing the orifice of shells. 



0-pis-tho-ccb'lous (Gr. oputhen, 

 behind ; koilos, hollow). Those 

 vertebrates with bodies hollow 

 l)ehind and convex in front. 



O'ral. Related to the mouth. 



Or-ni-tho-del'ph i-a (Gr. ornia, 

 bird ; delplius, womb). The 

 subclass of mammals and or 

 der Monotremata. 



Or-thop'te-ka (Gr. orthos, 

 straight ; pteron, wing). The 

 order of insects with straight 

 nari'ow fore- wings, as the grass- 

 hoppers 



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

 shelled). A group of shelled 

 Crustacea. 



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

 stone). Small bones suspended 

 in the internal ear of fishes, or 

 concretions in the auditoiy 

 sacs of invertebrates. 



0-vip'akous (Lat. ovum, an egg; 

 pario, I bring forth). Applied 

 to animals bringing forth eggs 

 instead of living, active young. 



O-vi-pos'i-tor (Lat. omim, an 

 egg; pono, I place). An organ 

 in insects homologous with the 

 sting, by which eggs are de- 

 posited in solid substances. 



O'vi-SAC. A sac or bag-like mem- 



brane attached to the parent, 

 and containing eggs. 

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

 an egg; mvus, alive; pario, I 

 bring forth). Applied to such 

 animals as retain their eggs in 

 the body until they are hatched. 



"Pm, do-gbn'e-sis. Parthenoge- 

 nous development in larval in- 

 sects. 



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

 mantle or body-wall of mol- 

 lusks, which secretes the shell; 

 adj. pallial. 



Pa-pil'la. a minute soft projec- 

 tion. 



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

 from^dJ'a, en, clmo, something 

 poured in besides). Applied 

 to the proper substance of vis- 

 cera, excluding connective tis- 

 sue, blood-vessels, and other 

 accessory parts. 



Par-the-no-gbn'b-sis (Gr. par- 

 tlienos, 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, llulie-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; hranchia, 

 gill). Those Batrachia which re- 

 tain their gills throughout life. 



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

 uneven; daktulos, finger). 



