GLOSSARY. 



695 



(E-SOPH'A-GUS (Gr. oisos, a reed ; 

 phagein, to eat). The gullet. 



ON-TOG'E-NY(Gr. on, onion, being; 

 gene, birth). The development 

 from the egg, of an individual 

 animal. 



O-PER'CU-LTJM (Lat. operio, 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. 



O-PIS-THO-CCE'LOUS (Gr. opisthen, 

 behind ; koilos, hollow). Those 

 vertebrates with bodies hollow 

 behind and convex in front. 



O'RAL. Related to the mouth. 



OR-NI-TIIO-DEL'PH I-A (Gr. ornis, 

 bird ; delphus, womb). The 

 sub-class of mammals and or 

 der Monotremata. 



OR-THOP'TE-RA (Gr. ortJtos, 

 straight ; pteron, wing). The 

 order of insects with straight 

 narrow fore-wings, as the grass- 

 hoppers 



OS-TRA'CO-DA (Gr. ostracodes, 

 shelled). A group of shelled 

 Crustacea. 



O'TO-LITHS (Gr. orts, ear ; litlios, 

 stone). Small bones suspended 

 in the internal ear of fishes, or 

 concretions in the auditory 

 sacs of invertebrates. 



O-VIP'A ROUS (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. ovum, 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. 

 O-VO-VI-YIP'A-ROUS (Lat. ovum, 

 an egg; vims, alive; pario, I 

 bring forth). Applied to such 

 animals as retain their eggs in 

 the body until they are hatched. 



DO GEN'E-SIS. Partbenoge- 

 iious development in larval in- 

 sects. 



PAL'LT-TJM (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'CHY-MA (Gr. paregchuma, 

 from para, en, chno, 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-GEN'E-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, lluke-worm, 

 etc. 



PEL'A-GIC. Living on the high 

 seas, away from the coast; in 

 mid-ocean. 



PER'I-SOME (Gr. peri, around; 

 soma, body). In Crinoids the 

 oral region of the cup or body. 



PE REN-NI-BRAN'CHI-A-TA (Lat. 

 peretinis, perennial : branchia, 

 gill). Those Batrachia which re- 

 tain their gills throughout life. 



PER-IS-SO-DAC'TY-LA (Gr. perissos, 

 uneven; daklulos, finger). 



