INDEX TO STRUCTURES AND SUBJECTS 



07 



Oesophagus, 16 (CI. II.) : 19 (CI. III.) : 34 (triple monster) : 63 

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

 CI. I.) : XXIII. 97 (triple monster). 



Olfactory capsular cartilage, 11 (normal): IS (CI. I.): 34 

 (triple monster): 40, 41, 4-.' (cyclopia): V. 22-'23 (s. 

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

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

 C in XXIV. 101 (cyclopia). 



Olfactory nerve, 41-44 (cyclopia): XIII. 47 (s. trans. CI. II.). 



Olfactory pit or organ, 49 (pug-head) : XII. 45 (s. horiz. 

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

 (cyclopia). 



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



Optic lobes, 3 (union) : IS (CI. X.) : 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. CI. I.) : 

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

 49-50 (s. trans. CI. n.): XV. 52 53 (s. horiz. CI. in.): 

 XXV. 109-110 (semi-cyclopia) : 01 in XXIV. 103, 106 

 (cyclopia). 



Optic nerve. See under nerve II. 



Optic vesicles, 6 (in young double monsters): $6 (hcmididy- 

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

 numerary eye). 



Osmotic pressure, 5, 27, 30, 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, 27-29. 



Oviducal, 40 (gland) : 41 (slits). 



Oviduct, 46 (in male skate): ^T(in hermaphroditic conditions): 

 62 (abnormal). 



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



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

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

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

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

 49-50 (s. trans. CI. II.): XXVI. Ill (cyclopia): XXV. 

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

 56 (normal), 58 (CI. I.), 60 (CI. II.): PI in XXIV. 105 

 (cyclopia). 



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

 horiz. CI. III.). 



Parachordal cartilage, 11 (normal) : 13 (CI. I.) : 16 (CI. II.) : 

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

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

 XII. 44-46 (s. horiz. CI. I.) : XIV. 51 (s. trans. CI. II.) : 

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

 (CI. I.), 60 (CI. ii.). 



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

 59, 60 (certain examples of). 



Parasphenoid in pug-head and round-head, 49, 50. 



Pathological conditions of ovum or early embryo, 60. 



Pectoral fin, 4, IS (CI. in.) : 4, 19 (CI. iv.) : 64 (supernumer- 

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

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

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

 monster). 



Pectoral girdle, 11 (normal): /;/ (CI. in.): 19 (CI. tv.) : 

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

 also XVIII. 06. 



Pelvic fin, 19 (CI. IV.): 20 (CI. v.): 21-22 (CI. vi.): Si 



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



55, CI (absence or defect): 56 (in "tailless trout"): 



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



XXIII. 97-98 (triple monster). 

 Periotic cartilage, /; (normal): 13 (CI. I.): 16 (CI. n.): 34 



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



horiz. norm.): IX. 38 (a. trans. CI. I.): X. 39, 40, XI. 



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



trans. CI. n.) : XV. 52, 53 (s. horiz. CI. in.) : XXV. 110, 



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



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

 Peritoneal lining, pigmentation of, 57. 

 Pharynx, 15 (CI. I.): /',' (CI. II.): IV. 17 (s. trans, norm.): 



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

 Pigment layer of retina, 4- (cyclopia) : 59 (supernumerary 



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

 Pigmentation, abnormalities of, 56-5S. 

 Pineal body, or sac or diverticulum, 13 (CI. I.): 41, 42 



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



trans. CI. i.): XIII. 48 (s. trans. CI. n.): XV. 53 



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



107, 108 (cyclopia). 

 Pituitary space, 11 (normal) : /.; (CI. I.) : 41 (cyclopia) : IX. 



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



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

 Planes of certain sections. See under diagrams. 

 Pneumatic ducts. See under air-ducts. 

 Polychaeta, 68 (as food of flatfish). 

 Polycylic hermaphroditism, 47. 

 Polyembryony. See under multiple forms. 

 Pons, 14 (CI. i.) : V. 22 (s. horiz. norm.). 

 Potentiality in teratology, xi, 5, 2S, 4S. 

 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, 4"i- 

 Pseudobranch and vessels, 12 (normal) : 14 (CI. 1) : 17 (CI. II. ) : 



41 (cyclopia). 

 Pug-head, f8. 



Quadruplicity, 36, 38. 



Radiation, posterior (Rauber), 2S. 



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

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

 monstrosities 2, 43. See also sections dealing with parti- 

 cular abnormalities. 



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

 CI. via.). See also under vent. 



Rectus abdominis, .:', (in anakatadidymus). 



Rectus oculi, externus, 11 (normal) : 14 (CI. 1.) : 17 (CI. II.) : 

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

 XII. 45, 46 (s. horiz. CI. I.) : XIII. 48 (s. trans. CI. II.) : 

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



Rectus oculi, inferior, 14 (CI. I.) : 41, 42 (cyclopia) : III. 15, 

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

 CI. 1.) : XIII. 47, XIV. 49, 50 (s. trans. CI. 11.): XXV. 

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



