INDEX TO STRUCTURES AND SUBJECTS 



Cl. 1.) : X. 39-40, XI. 41-42, XII. 43-40 (s. lioriz. CI. I.) : 



XXIV. KKJ (cyclopia), 105, 100 (supernumerary eyes): 



XXV. 1(17-1 10 (cyclopia and semi-cyclopia). 



Eyes, muscles. See under obliquus and rectus. 



Fins. See under anal, caudal, membrane dorsal and ventral 

 edge, pectoral, pelvic. 54-56, 61 (abnormalities of) : 55, 

 56, 61 (fin rays). 



Fishes. See special Index, 68. 



Fission, S (of embryonic rudiment) : ..'7, 88 (of embryonic axis 

 in hemididymus) : 54 (of single axial structure). 



Fontanelles, 11 (normal) : tS (Cl. i.) : 16 (Cl. a.): f\,/2,/3 

 in XVII. 57 (normal), 59 (Cl. i.), 61 (CL u.) : XXI. 89, 

 92 (diagrams). 



Fowl. See under birds. 



Fragmentation of ova, SO. 



Frequency, 1 (of double monstrosity in fishes and birds) : 33 

 (of triple monstrosity in fishes and birds) : ,"■, ?8(ot differ- 

 ent types of double monstrosity) : 41 (of cyclopia). 



Frog larvae, 4 1- 



Fusion, 4, 6 (primary) : 4, 11, 16, SO (secondary) : 40-44 (of 

 cerebral lobes, mid-brain, eyes, etc., in cyclopia) : 13-89 

 (of homologous structures at transitional region in double 

 monstrosity, passim). 



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



XXVI. Ill (semi-cyclopia). 



Ganglion, nerve VIII., /," (Cl. II.) : IV. 17 (s. trans, norm.) : 



XIV. 51 (s. trans. Cl. II.). 

 Ganglion, vagus, 17 (Cl. II.): IV. 18 (s. trans, norm.): IX. 



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

 Gastrulatiou, 1, 30 (double in Petromyzon) : 6 (centres in 



double monstrosity). 

 Germ cell, predisposition in, 5, 33. See also under autogenetic. 

 Germinal area, mammalian, <S', 88. 

 Gill. See also under pseudobranch and visceral arches. 34 



(triple monster) : 61 (absent) : 68 (variation in lamprey) : 



68 (replacing teeth) : XI. 42, XII. 45, 46 (s. horiz. Cl. i. ) : 



XVI. 54 (s. horiz. Cl. in.). 

 (Jill cover, 61 (absent or deformed) : V. 23 (s. horiz. norm.) : 



XVI. 54 (s. horiz. Cl. III.). 

 Glomerulus of head-kidney, 10 (absence) : 18 (normal) : /./ 



(Cl.i.) : 18 (Cl. ii.) : 19 (Cl. m.) : V. 23 (s. horiz. norm.) : 



XI. 41 (s. lioriz. Cl. i.) : Ol in XX. 83 (normal), 84, 85 



(Cl. i.): 86 (Cl. iv.): 87 (Cl. in.). 

 Glossohyal. See copula visceral arch II. 

 Gonads, Iff, 43 (in hermaphroditism) : 68 (defects). 

 Grooves, ~4 (on surface of yolk) : 41, ',.' (in floor of brain in 



cyclopia) : 5'J (in supernumerary eye). 



Haemal arch cartilage, 1J (normal) : 13 (Cl. I.) : 17 (Cl. II.) : 



S3 (hemididymus) : IV. 19 (s. trans, norm.) : XII. 43 (s. 



horiz. Cl. i.): XVI. 55 (s. horiz. Cl. in.). 

 Harelip, apparent, in a trout embryo, 59. 

 Head-kidney or pronephros, 18 (normal): 14 (Cl. I.): IS 



(Cl. ii.): 1!) (Cl. in.): 80 (CI. rv.) : IV. 19 (s. trans. 



norm.): V. 23 (s. horiz. norm.): XI. 41, XII. 45 (s. 



horiz. Cl. I.): XXII. 96, XXIII. 97 (triple monster): 



HK in the last five Figs, cited under glomerulus. 

 Hemididymus, ~'5-.19 (in Salmonidae) : ?6 (in Esox) : 55 



(doubling of dorsal fin) : B8 (twisting of body). Sec also 



under katadidymus and mcsodidynius. 

 I 



Hereditary nature, of abnormalities, .</, 50. See also 



Hermaphroditism, 46-48. 



Hernia in a dogfish, 68. 



" Heterocercal," portion of tail, 18 (norma!): ..'/, 88 (Cl. 



VI.). 

 Hiatus or cleft, in mesodidymus, 35, 86, 38. 

 Hog-back. See under hump-back. 

 Homoeosis, 56, 58. 



Homologous or identical twins, 7, 37 : triplets, 88. 

 Hooking of dorsal fin in flat fishes, 55, 57. 

 Hump-back, 51-68, 



Hyoid artery, 1! (normal) : 1!, (Cl. I.) : /; (Cl. n.). 

 Hyoid cartilage. See under visceral arch II. 

 Hyomandibular, // (normal): 13 (Cl. I.): 16 (Cl. II.): >,'.> 



(pug-head): 50 (round-head) : IV. 17 (s. trans, norm.): 



V. 23 (s. horiz. norm.) : XI. 41, 42, XII. 45, 46 (s. horiz. 



Cl. I.): XIII. 48, XIV. 49, 51 (s. trans. Cl. II.): i in 



XVII. 56 (normal), 58 (Cl. I.), 60 (Cl. n.): XXI. S8, 89 



(diagrams): XXVI. Ill (cyclopia). 

 Hypoaria, IS (Cl. I.): 41, 41 (cyclopia): IX. 37 (s. trans. 



Cl. i.): XI. 41, 42, XII. 45 (s. horiz. Cl. I.): XIV. 50 



(s. trans. Cl. u.) : Hyn in XVIII. 72 (Cl. I.). 

 Ifypohyal. See under basihyal. 

 Hypophysis, IS (Cl. (.) : 41, 4 J (cyclopia) : 69 (double) : V. 23 



(s. horiz. norm.) : XI. 41, 42, XII. 45, 40 (s. horiz. Cl. i.) : 



Hyp in XVIII. 72 (Cl. I.). 



Induced, abnormalities. See under acquired. 



"Individualities," mixing of, in double monster, 60. 



Infundibulum, 13 (CI. I.) : III. 10 (s. trans, norm.) : V. 23 (s. 

 horiz. norm.): VIII. 36 (s. trans. Cl. I.): XII. 45, 46 (s. 

 horiz. Cl. i.) : XIV. 49 (s. trans. Cl. II.) : In/ in XVIII. 

 72 (Cl. I.) : XXV. 109, 110 (semi-cyclopia). 



Injury, mechanical, 58, 68. See also under experimental. 



Intestinal canal, 18 (normal): 16 (Cl. 1.): IS (Cl. II.): 19 

 (Cl. in.) : SO (Cl. iv.) : ,.'/ (Cl. v.) : 83 (Cl. VI.) : 85 (hemi- 

 didymus) : 34 (triple monster) : 68 (hernia) : IV. 20, VI. 

 24 (s. trans, norm.) : VI. 27, XXVI. 114 (s. trans. Cls. v., 

 vi.): XVI. 54 (s. horiz. Cl. in.): XXVI. 113 (absent 

 notochord) : XXII. 95, XXIII. 97-99 (triple monster). 



Invertebrates, 5 (ova). 



Islay, tailless trout from, 56. 



Iter or Sylvian aqueduct, HI. 16 (s. trans, norm.) : IX. 37 

 (s. trans. Cl. I.) : XIV. 50 (s. trans. Cl. n.) : XV. 53 (s. 

 horiz. Cl. in.): CIt in XVIII. 69-71, XXV. 110 (semi- 

 cyclopia). 



Jaws. See under visceral arches. Also 41, 4~ (cyclopia) : 40 

 (pug-head) : 60 (round-head) : 51 (lower absent) : 50 

 (accessory) : 68 (gill tufts instead of teeth) : 68 (mouth 

 absent): VIII. 35 (s. trans. Cl. (.): XVI. 54 (s. lioriz. 

 Cl. in.): XXV. 107, 108 (cyclopia). 



Jugular vein, 18 (CI. n.): 10 (Cl. Hi.): IV. 18 (s. trans. 

 norm.): IX. 3S (s. trans. Cl. I.): XIV. 51 (s. trans. 

 Cl. ii.): VI in XIX. 73 (normal), 74 (Cl. m.), 75 

 (Cl. iv.). 



Katadidymus, .>, 5, 6, 3, .'.7. See also under hemididymus. 

 Kidney, 68 (variations in). See also head-kidney, Wolffian 



body. 

 Kirkcudbright, tailless trout from, 56. 

 Kupll'cr, two vesicles of, ."'. 



