xiv LIST OF WOODCUTS 



FIGURE PAGB 



23. Helix pomatia : Dissection from the right side, to show the 



digestive and reproductive systems . . . 112 



24. Section along the axis of the shell, transverse to 



the foot 122 



25. Astacus fluviatilis : Transverse section through the abdomen 126 

 20. Diagrammatic transverse section through the 



thorax 134 



27. Dissection of a male from the right side . .138 



28. Periplaneta americana : The head, front view . . . . 154 



29. The head, from behind . . . . . .154 



30. Dissection of a male from the right side . . . 160 



31. Amphioxus lanceolatus : A young specimen, seen from the 



right side 170 



32. Transverse section through the anterior part of 



the pharynx . . 185 



33. Transverse section through the posterior part of 



the pharynx 189 



34. Transverse section through the atrial pore . . . 191 



35. Transverse section through the anus . . . 192 



36. Scyllium canicula : The skull and visceral skeleton from the 



right side 202 



37. Longitudinal and vertical section through the 



head and anterior part of the body . ... 218 



38. The venous system . 222 



39. The branchial blood-vessels . . . . .227 



40. Transverse section through the posterior dorsal fin . 231 



41. Lepus cuniculus : The skull from the right side . ... 268 



42. Dissection of a male from the left side . * . . 300 



43. Longitudinal and vertical section of the brain . . 342 



44. Transverse section of the brain, passing through 



the third ventricle 350 



45. Transverse section of the brain, passing through 



the cerebellum 353 



46. Gallus bankiva : The left half of the skeleton, from the right 



side 356 



47. The skull, from the right side 364 



48. Columba lima : Dissection from the right side . . . 394 



