934 



INDEX 



OIKOPL&URA, oikoplii'ra (G. oikos, 



house -+- pleura, side) 544 



One of the order JAirvacea. 



OKEN, o'ken 415 



A German naturalist, 1779-1851. 

 OLECRANON, olekra'non (G. olekra- 



non, point of the elbow ) 711 



Pertaining to a process of the 

 ulna; the elbow. 



OLFACTORIUS LATERAL/IS NU- 

 CLEUS 841) 



OLFACTORY, olfak'tori (L. olere, 



smell ) 62, 68 



Capsules 540 



Ditot s 870 



Pits 581 



Placodes 581 



Recess 570 



OLIGOCHAETA, ol'igdke'ta (G. oligos, 



few + cMite, hair) 283. 421 



A class of Annelida. 



OLIVE OF SPINAL CORD 841 



OLMS (German name for the white, 



blind, cave mud-puppies) 649 



M A S U S, om.Vsfts (L. omasum, 



paunch ) 745 



OMENTUM, oment'iim (L. omentum, 



a fold) 537, 726, 746 



OMMATID1UM, dm'atid'ium (G. omma. 



eye) 322 



OMNIVOROUS, omniv'orus (L. omnis, 



all -f voro, eat ) ISO 



Eating both plant and animal food. 



OMOSTERNUM, 6'moster'num ( G. 



omos, shoulder -f- sternon, breast) . . 



. . .76, 101 



OMPHALOMESENTER1C VEIN, om'- 

 falomes'enter'ic (G. omphalos, navel 



+ mesenteron, mid-gut) J/Oi) 



OMPHALOMESENTERIC VS. VITEL- 



LINE, vitel'm (L. vitellus, yolk) . . .483 

 O\ 7 I8CU8 A8CELLV8, onis'kus asel'us 



(G, oniskos, a wood-louse) .82(> 



Typical genus of Oniscidae. 

 ONYCOPHORA, onikof'ora (G. OMOS, a 

 claw or nail + pherein, to bear) . . 



421, 428 



OOCYST, 6'dsist (G. oo, egg + kustis, 



bladder) 132 



OOCYTE, 6'oslt (G. oow + kytos. cell) 



'. . . .100, >,!,X 



OOECIUM, de'shium (G. oon, egg + 



oikos, house) 310 



A brood-pouch. 



OOGENESTS IN EARTHWORM, 

 oojen'esis (G. oon + genesis, de- 

 scent) 279 



OOGONIIA, plural of oogonium/ 10<) 



OOGONIUM, dogo'nium (G. oon -4- 



yonos, offspring) 298 



OOKINETE, ookinet' (G. oon + 



kinein, to move) ,' 132 



OOKPORA HOVIN. o'dspora (G. oon -f' 



sporos, seed ) 1 / 



OOSPORE (same as oospora) . . . 151, /<S7 

 OOTYPE, d'otype (G. oon -f type, 



place) . '. '#.%' 



Place where the sliell is formed. 



OPALINA, opall'na (like opal) 15 .', 



OPAQUE, opak' (L. opart/ , darkened) 437 



Impervious to light. 



OPEN CIRCULATION, definition of.. 270 

 . OPERCULAR TUBE, definition of . . . ,586 

 OPERCULUM, oper'kulum (G. opercn- 



lum, a lid) 21t> 



Of plants 220 



Of tadpole 549, 580 



OPIIIDIA, ofid'ia (G. ophis,- serpent 



+ eidos, form) . .425, 654, 704 



OPHIU ROI DE A, of 'iuroi'dea ( G. 



ophiouros, serpent-tailed) .... .420, 428 

 OPHTHALMIC, ofthal'mic (G. opthal- 



mikos, of or for the eyes ) 31!) 



OPILIONE8, opilio'nez (L. opilio, a 



shepard) 422 



An order of Arachnids. 

 OriSTHOBRANCHIA, opisthobrang'- 

 kia (G. opisthe, behind -f- branch, 



gills) 421 



OPISTHOCOELOUS, opisthose'lus (G. 

 opisthe + koilos, hollow), definition 



of . 683 



OPISTHODELPHYS, opisthodel'fis (G. 



opisthen, behind + delphis, dolphin ) 81 6 

 OPI8THOGONEATA (G. opisthe + 



gone, genitalia) . .422 



A subclass of Myriapoda. 

 OPISTHOMI, opisthd'mi (G. opisthen. 



behind + omos, shoulder) <)4."> 



OPI8THORCI8 FELINEUS, opisthor' 

 kis felin'eus (G. opisthe + orchis. 



testicle) 2!>2 



Noverca 2!*.' 



Sinensis , 2!>:{ 



OPISTHOTIC, dp'isthdt'ik (G. opisthe 



+ oiut, ear) (H>^ 



OPOSSUM, opos'um f>.7? 



OPOTERODONT8, opot'erddonts (G. 



opoteros, either -j- odoirs, tooth) . . . .70(5 

 OPSONIN, dp'sdnin (G. opsonein, to 



cater) . definition of . 200 



OPTIC CHIASMA (G. opsis, sight).. 571 



Tjob.es 512 



Nerve , 70 



Pe.dicle 875 



Stalks 478 



Vesicles 474 



OPTICAL SECTION 2?/' 



OPTIMUM, dp'timum (L. optimus, 



best ) , definition of 1 29 



OPTOCOELE, op'tosel (G. opsis, sight 



+ koilos, hollow ) 490 



ORAL OPENING (L. os. mouth) ..... 48 

 Plate . . .493, 58.1 



