INDEX TO STRUCTURES AND SUBJECTS 



Oesophagus, 16 (01. n.) : 19 (Cl. HI.) : 34 (triple monster) : 62 

 (hernia into) : IV. 19 (a. trans, norm.) : XII. 45 (s. horiz. 

 Cl. I.) : XXin. 97 (triple monster). 



Olfactory capsular cartilage, 11 (normal): 13 (Cl. I.): 3^ 

 (triple monster): 40, 41, 42 (cyclopia) : V. 22-23 (s. 

 horiz. norm.): XI. 41-42, XII. 45-46 (s. horiz. Cl. I.) : 

 XIII. 47-48 (s. trans. Cl. n. ) : XXI. 88-89 (diagrams) : 

 O in XXIV. 101 (cyclopia). 



Olfactory nerve, 41-44 (cyclopia): XIII. 47 (s. trans. Cl. u.). 



Olfactory pit or organ, 40 (pug-head) : XII. 45 (s. horiz. 

 Cl. I.): XIII. 47-48 (s. trans. Cl. n.) : XXIV. 100-101 

 (cyclopia). 



Optic chiasma, V. 23 (s. horiz. norm.). 



Optic lobes, S (union): 13(Cl.i.): 41-42 (cyclopia) : 59 (super- 

 numerary eye): III. 14-16 (s. trans, norm.): V. 21 (s. 

 horiz. norm.): VIII. 35, 36, IX. 37 (s. trans. Cl. I.) : 

 X. 39-40, XII. 43-44 (s. horiz. Cl. I.): XIII. 48, XIV. 

 49-50 (s. trans. Cl. n.): XV. 52-53 (s. horiz. Cl. m.): 

 XXV. 109-110 (semi-cyclopia) : Ol in XXIV. 103, 106 

 (cyclopia). 



Optic nerve. See under nerve II. 



Optic vesicles, 6 (in young double monsters) : S6 (hemididy- 

 mus): 29 (parallel union) : 43-44 (cyclopia) : 59, 60 (super- 

 numerary eye). 



Osmotic pressure, 6, 27, SO, 44, SO. 



Otocyst, 26 (mesodidymus) : 34, XXIII. 97 (triple monster). 

 See also under auditory. 



Ovaries, in hermaphroditism, 47. See also gonads. 



Overgrowth of blastoderm over yolk, 6, 9, 27-S9. 



Oviducal, 46 (gland) : 47 (slits). 



Oviduct, 46 (in male skate) : 47 (in hermaphroditic conditions) : 

 62 (abnormal). 



Paired fins, possible origin of, 54. See also pectoral, pelvic. 



Palato-pterygoid, or palate-quadrate cartilage, 11 (normal) : 

 13 (Cl. I.) : 16 (Cl. II.) : 40-41 (cyclopia) : 49 (pug-head) : 

 59 (supernumerary eye): III. 13-16 (s. trans, norm.): 

 VIII. -IX. 35-37 (s. trans. Cl. I.): XIII. 47-48, XIV. 

 49-50 (s. trans. Cl. n.): XXVI. Ill (cyclopia): XXV. 

 108 (cyclopia) : XXI. 88-89 (diagrams) : /and/' in XVII. 

 56 (normal), 58 (01. I.), 60 (Cl. n.): PI in XXIV. 105 

 (cyclopia). 



Pancreatic tissue, IV. 20 (s. trans, norm. ) : XVI. 54 (s. 

 horiz. Cl. in.). 



Parachordal cartilage, 11 (normal) : 13 (Cl. I.) : 16 (01. n.) : 

 63 (doubled notochord) : IV. 18 (s. trans, norm.) : V. 22 

 (s. horiz. norm.): IX. 38 (s. trans. Cl. I.): XI. 41-42, 

 XII. 44-46 (s. horiz. Cl. I.): XIV. 51 (s. trans. Cl. n.): 

 XXI. 88-89 (diagrams): G in XVII. 56 (normal), 58 

 (Cl. I.), 60 (Cl. n.). 



Parasitic forms, 3, 4 (classification) : 54 (as accessory fins) : 

 69, 60 (certain examples of). 



Parasphenoid in pug-head and round-head, 49, SO. 



Pathological conditions of ovum or early embryo, 60. 



Pectoral fin, 4, 18 (Cl. in.) : 4, 19 (Cl. IV.) : 54 (supernumer- 

 ary) : 55 (notched, fused with skin): 56 (in "tailless 

 tront"): 61 (defective): IV. 19 (s. trans, norm.): 

 XVI. 54 (s. horiz. Cl. in.): XXIII. 97-98 (triple 

 monster). 



Pectoral girdle, 11 (normal): 19 (Cl. in.): 19 (Cl. iv.) : 

 IV. 18 (s. trans, norm.) : IX. 38 (s. trans. Cl. i.). See 

 also XVIII. 66. 



Pelvic fin, 19 (Cl. iv.): 20 (Cl. v.): 21-22 (Cl. VI.): 34 



(triple monster) : 52 (displaced) : 54 (supernumerary) : 



65, 61 (absence or defect) : 56 (in " tailless trout ") : 



VI. 25 (s. trans, norm.): VI. 28 (s. trans. Cl. vi.): 



XXIII. 97-98 (triple monster). 

 Periotic cartilage, 11 (normal): 13 (Cl. I.): 16 (Cl. 11.): S4 



(triple monster) : IV. 17 (s. trans, norm.) : V. 21-23 (s. 



horiz. norm.): IX. 38 (s. trans. 01. I.): X. 39, 40, XI. 



41, 42, XII. 43, 44 (s. horiz. Cl. I.) : XIV. 49, 50, 51 (s. 



trans. Cl. n.) : XV. 52, 53 (s. horiz. Cl. HI.) : XXV. 110, 



XXVI. Ill (semi-cyclopia) : XXI. 88-92 (diagrams) : k in 



XVII. 56 (norm.) : 58 (Cl. I.), 60 (Cl. n.). 

 Peritoneal lining, pigmentation of, 57. 

 Pharynx, 15 (01. I.): 16 (Cl. n.): IV. 17 (s. trans, norm.): 



IX. 38(s. trans. Cl. I.). 

 Pigment layer of retina, 43 (cyclopia) : 59 (supernumerary 



eye) : XXIV. 104 (cyclopia) : XXV. 109 (semi-cyclopia). 

 Pigmentation, abnormalities of, 56-58. 

 Pineal body, or sac or diverticulum, 13 (Cl. I.): 41, 4% 



(cyclopia): III. 13 (s. trans, norm.): VIII. 35 (s. 



trans. Cl. I.): XIII. 48 (s. trans. Cl. n.): XV. 53 



(s. horiz. Cl. m.) : Pin in XXIV. 102 (cyclopia) : XXV. 



107, 108 (cyclopia). 

 Pituitary space, 11 (normal) : 13 (Cl. I.) : 41 (cyclopia) : IX. 



37 (s. trans. Cl. I.) : XXI. 88, 90 (diagrams) : m in XVII. 



56 (normal), 58 (Cl. I.), 60 (Cl. n.). 

 Planes of certain sections. See under diagrams. 

 Pneumatic ducts. See under air-ducts. 

 Polychaeta, 58 (as food of flatfish). 

 Polycylic hermaphroditism, 47. 

 Polyembryony. See under multiple forms. 

 Pons, 14 (Cl. I.) : V. 22 (s. horiz. norm.). 

 Potentiality in teratology, xi, 5, S8, 48. 

 Predisposition. See under germ. 

 Preopercular in ambicoloured flatfish, 57. 

 Pressure, 44- See also under osmotic and experimental. 

 Primarily formed portion of body, 27. 

 Primary fusion. See under fusion. 

 Primitive streak, 6. 

 Proboscis, in cyclopia, 40, 43. 

 Pronephros. See under head -kidney. 

 Protandry in hermaphroditism, 47. 

 Pseudobranch and vessels, 12 (normal) : 14 (Cl. I) : 17 (Cl. II. ) : 



41 (cyclopia). 

 Pug-head, 48. 



Quadruplicity, 36, 38. 



Radiation, posterior (Rauber), S8. 



Records, of double monstrosity in osseous fishes 1, in carti- 

 laginous fishes 30-31, and in other fishes 30 ; of survival of 

 monstrosities S, 43. See also sections dealing with parti- 

 cular abnormalities. 



Rectum, VI. 25, 26 (s. trans, norm.): VI. 28, 29 (s. trans. 

 Cl. via.). See also under vent. 



Rectus abdominis, @4 (' n anakatadidymus). 



Rectus oculi, externus, 11 (normal) : 14 (Cl. i.) : 17 (Cl. II.) : 

 41, 42 (cyclopia) : V. 22, 23 (a. horiz. norm.) : XI. 41, 42, 

 XII. 45, 46 (s. horiz. Cl. I.) : XIII. 48 (s. trans. Cl. n.) : 

 XXI. 88, 89 (diagrams) : XXVI. Ill (semi-cyclopia). 



Rectus ocnli, inferior, 14 (Cl. I.) : 41, 42 (cyclopia): III. 15, 

 16 (s. trans, norm.): VIII. -IX. 35, 36, IX. 37 (s. trans. 

 Cl. i.) : XIII. 47, XIV. 49, 50 (s. trans. Cl. n.): XXV. 

 108 (cyclopia) : XXV. 110 (semi-cyclopia). 



