64 



INDEX TO STRUCTURES AND SUBJECTS 



Causation, 4 (of double monstrosity): 33 (triple monstrosity) : 



44 (of cyclopia) : 4S (of pug-head) : 52-03 (of twisted 



body) : 55 (of tin abnormalities). 

 Cavity, cerebral lobes, 41-43 (cyclopia): III. 13 (s. trans. 



norm.) : VIII. 35 (CI. I.) : X. 39-40, XII. 43, 44 (a. horiz. 



CI. I.): XIII. 47 (s. trans. CI. II.): CFB in XVIII. 69 



(normal), 70 (CI. I.), 71 (CI. n.) : XXI. 91-93 (diagrams) : 



XXV. 102 (cyclopia). 

 Cavity, optic lobes, III. 14-16 (s. trans, norm.): V. 21 (s. 



horiz. norm.) : VIII. 36, IX. 37 (s. trans. CI. I.) : X. 39 40 



(s. horiz. CI. I.) : XV. 52-53 (s. horiz. CI. in.) : COL in 



XVIII. 69 (normal), 70 (CI. I.), 71 (CI. n.), 72 (CI. I.): 



XXI. 91-93 (diagrams): CO in XXIV. 106 (parasitism): 



XXV. 109-110 (semi-cyclopia). 

 Ceratohyal, 11 (normal): 10 (CI. n.): XVI. 54 (s. horiz. 



CI. in.). 

 Cerebellum, Gl (anomaly of) : IV. 17 (s. trans, norm.) : V. 21 



(s. horiz. norm.): XV. 52 (s. horiz. 01. in.): XXVI. Ill 



(semi-cyclopia). 

 Cerebral lobes, 13 (CI. I.): 41-42 (cyclopia): neural epithelial 



organ connected with, Gl : III. 13 (s. trans, norm.) : V. 



21-22 (s. horiz. norm.) : VIII. 35 (s. trans. CI. i.) : X. 39 



(s. horiz. CI. I.) : XIII. 48 (s. trans. CI. II.) : XXV. 107- 



108 (cyclopia) : XXVI. 112 (s. trans, atrophic head). 

 Chick. See under birds. 

 Chordate, 43 (ancestry). 

 Choroidal arteries, 12 (normal): 14 (CI. I.) : 41 (cyclopia): 



AChor in XVIII. 67 (CI. I.), 68 (CI. n.): XXVI. Ill 



(cyclopia). 

 Choroidal fissure of eye, 14 (CI. I.) : 41-4' (cyclopia): XL 



41-42 (s. horiz. CI. I.): XXIV. 104 (cyclopia), 105 



(supernumerary eye) : XXV. 110 (semi-cyclopia). 

 Choroidal gland, 12 (normal) : 14 (CI. I.) : 41, 42 (cyclopia) : 



XXV. 108 (semi-cyclopia). 

 Circulation, 24 (in anakatadidymus) : GO (embryos without). 



See also heart, etc. 

 Cirripedes, 4S (hermaphroditism). 

 Classification, 3-4, 31-32 (in double monstrosity) : 3S (in 



triple monstrosity): 40 (in cyclopia): 47 (in herma- 

 phroditism). 

 Coalescence of vertebrae. See under synostosis. 

 Cold, iufluence of, in producing twisted body, 5.'. 

 Coloration, 56. 



Concrescence, theory, G, 10, 25-2S. 

 Copula visceral arch II. (glossohyal), 11 (normal): 1G (CI. II.): 



III. 13 (s. trans, norm.): XVI. 54 (CI. III.): OH in 



XVIII. 64 (CI. i.), 65 (CI. II.). 

 Copula visceral arch III., VIII. 36 (s. trans. CI. I.): XVI. 



54 (s. horiz. CI. in.): Cop in XVIII. 64 (CI. I.), 65 



(CI. II.). 

 Cranial skeleton, 11 (normal) : 13 (CI. I.) : 15 (CI. II.) : 40,4- 



(cyclopia) : 44 (semi-cyclopia) : 4S (pug-head) : 49 (round- 

 head). See also XVII., XXI. 

 Cranio-facial defects, 40-44 (cyclopia) : 4S-51 (pug-head, etc.) : 



59-GO (parasitism) : 61 (atrophy) : 62 (absence of mouth, 



etc.). 

 Crustacea, 5S (as food of flatfish). 

 Curvature, 25, 53 (of body and tail in hemididymus) ; 51-53 



(do. in hump-back, etc.): 43-50 (of snout in pug-head 



and round-head). 

 Cuvier, duct of, IS (CI. in.) : 20 (CI. IV.) : XIX. 73 (normal), 



75 (CI. in.), 74 (CI. iv.). 

 "Cyclopean" position of eye in ambicoloured flatfish, 57. 



Cyclopia, 7 (in double monsters) : 40-4$ (classification, struc- 

 ture, comparison, etc.). 

 Cyclopic ray, 2, 43. 

 Cyclops, 1, 43. 



Defects, 10, GO (in formation of embryonic rudiment) : 25-29 (of 

 inner structures in hemididymus) : 33-34 (in triple mon- 

 ster) : 40-42 (in cyclopia) : 43-51 (cranio-facial) : 52 (of 

 lateral muscles) : 54 (of notochord) : 55, 56, 61 (of fins and 

 fin rays, etc.), 57 (in ambicoloration) : 62 (in gonads): 

 51, 62 (of mouth, jaws, etc.) : 59, 60 (in parasitism, etc.). 



Dehiscence, of body-halves (Rauber), 26 : of ova into body- 

 cavity, 47. 



Development, G, 27 (fishes) : 6, 8, 10 (double monstrosity in 

 fishes and other vertebrates) : 36 (triple monstrosity) : 

 42-43 (of cyclopic embryos). 



Diagrams of cranial skeleton illustrating the planes of the 

 sections figured in VIII. -IX. (CI. I.): XIII. -XIV. (CI. n.). 



Dichotomy or fission, S, 27, 28. 



Dioecious condition in fishes, etc., 46-43. 



Distance between centres of embryo-formation on blastoderm, 

 6, 7, 30, 35, 36. 



Dog, 37 (triplicity) : SO (pug-head). 



Dorsal edge membrane, inch dorsal fins, 1.' (normal): 20 

 (CI. v.) : 21, 22 (CI. vi.) : 34 (triple monster) : 52 (hemi- 

 didymus) : 54, 55 (various abnormalities) : 57 (on head 

 of flatfish) : VI. 24, 25 (s. trans, norm.) : VI. 27-29, VII. 

 30, 31 (s. trans. CI. vi.) : VII. 32-34 (triple monster). 



Double eggs, 61. 



Double monstrosity in fishes, passi?n in Chap. I. pp. 1-32 (see 

 Contents, vii-viii) : 8, 2S (in vertebrates generally). 



Drops}' of central nervous system and cyclopia, 40. 



Duct. See under air, bile, Cuvier, Wolffian. 



Duplicity. See under double monstrosity. Also 25 (imperfect 

 in hemididymus) : 54 (of notochord). 



Early stages, 6, 9 (of double monstrosity in Salmonidae and 

 Esox) : 35 (of triple monstrosity) : 43 (of cyclopia) : 60 

 (pathological conditions in). 



Edentate. See under Tatusia. 



Edge, apparent dorsal, of head in flat-fishes, 57. See also 

 under membrane. 



Efferent ducts of gonads in hermaphroditic fish, 47 : do. in 

 Salmonidae, 47. 



Embryo and embryonic rudiment. See under blastoderm, 

 margin, and rudiment. 



Entoderm, primary, in mesodidymus, 26, 2S. 



Environment, and causation of abnormalities, xi, 5, 43, 44, 

 50, 51, 53, 55, 5S. See also under experimental. 



Ethmoidal bones in pug-head, 49. 



Excess, 6-9, 27, 28, 35 (as regards embryonic rudiments, 

 blastoderms, or through fission) : 54 (in abnormalities of 

 fins) : 57 (associated with ambicoloration). See also 

 supernumerary. 



Experimental work on the production of various abnormalities, 

 xi, 2, 5, 25, 26, 27, 28, SO, 43, 44, 53. See also environ- 

 ment. 



External factors. See under environment. 



Eyes, 5, 11: 14 (CI. I.): 26 (hemididymus) : 5C(quadruplicity): 

 40-45 (cyclopia) : 49 (pug-head) : 50 (round-head) : 56 

 (in ambicoloration) : 59 (supernumerary) : 60, 61 (absence) : 

 GO, 61 (represented by lens) : III. 13-15 (s. trans, norm.) : 

 V. 21-23 (s. horiz. norm.): VIII. 36, IX. 37 (s. trans. 



