27. Details of the formation of an acne,agory cotyledon in a Cow's 



placenta of the 6tli montli 77 



28. Sheep. — Detail of cotyledonavy crypt 79 



29. Sheep. — Formation of new crypt-cavities by the downprowth 



of cell-masses from patches of unmodified — not flattened — 



epithelium 81 



.30. Section through one side of the chorionic ring and base of the 



diverticulum allantoidis of the Sheep 82 



31. a and h. Amniotic epithelial thickening, c. Glycogenic epithelium 



of the allantoic stalk, and d^ e. Glycogenic connective-tissue 

 cells, of Cow of 4 months 84 



32. Uterus of Sheep 91 



33. Rhomboidal and lanceolate crystals of bilirubin obtained from 



a chloroform solution of the dried allantoic bodies of the 

 Pig 93 



34. Skulf of Wolf 115 



35. Skull of Hare 115 



36. Diagram of jaws. Type 1 115 



37. Skull of Dog. A. Glenoid fossa deepened by a process of the 



squamosal bone. B. Cylindrical condyle of lower jaw .... 110 



38. Diagram of jaws. Type 2 116 



39. Diagram of jaws. Type 2. Showing the crowns of the teeth 



set in a plane at right angles to the greatest pressure 117 



40. Diagram of jaws. Type 2, Showing the emenentia articularis . 117 



41. Diagram of jaws. Type 2. Showing lengthening of jaws in 



order that incisors may be widely separated, &c 118 



42. Diagram of jaws. Type 2. Showing the introduction of a second 



angle to procure wide separation of the incisors, &c 119 



43. Skull of Tragiilus jaimnicus 119 



44. Diagram of Snake's jaws 120 



45. Skull of Iguanodon bernissartensis 121 



46. Diagram of jaws. Type 2 R 121 



47. Skull of BaUujur Tortoise 122 



48. Ring-tailed Lemur and young 124 



49. Lateral aspect of the skulls of: — a. Pseudocolnptes boimneauH. 



b. Hylactes megapodius. c. Batara cinerea. d. Dendroco- 

 laptes jncumnus 136 



50. Ventral aspects of the skulls of : — a. Hylactes megapodius. 



b. Philepitta Jala. c. Pseiidocolaptes boissineauti. d. Den- 

 drocolaptcs picummis. e. Batara cinerea, f. Xijihorhynchus 

 trochilirostris. g. Dorsal aspect of skull of Pse?^f7oco/o';;f<'.s . . 140 



51. Form of tlie posterior border of the sternum and the relations of 



the articulations of the bones of the Shoulder-girdle at the 



foramen triosseura 148 



.')2. rhylogenetic tree indicating the probable relationships of the 



" Tracheophoue " Passeres 158 



53. f(?r«YorZ//.s_/()?\';to7 in various positions of rest and movement .. 173 



54. Ceratcdus f'lrsteri m various ])ositions of rest and movement . . 175 



