LIST OF ILLUSTRATIONS xi 



Kl(. PAGE 



742. Muscles and nerves of eye . 107 



743. Pineal eye of Hatteria . . 108 



744. Organ of hearing . . . 109 



745. Section of Ampulla . . 109 

 746 Urinary tabule ... .111 



747. Diagrams of urinogenital organs . . . 112 



748. Development of mesoderm in Frog . .114 



749. Petromyzon marinus, external views of head . .116 



750. ,, ,, skull, with branchial basket . . 117 



751. . . . 119 



752. ,, ,, dissection of female ... . 121 



753. ,, brain .... . . .123 



754. ,, ,, ,, with olfactory and pituitary sacs . . 124 



755. ,, ,, development of olfactory and pituitary sacs. 125 



756. ,, ,, auditory organ 126 



757. ,, ,, transverse section of abdomen . . . 126 



758. ,, ,, urinogenital sinus and related parts . 127 



759. ,, development . . . 127 



760. ,, fluviatilis, head of larva . . . 128 



761. Head of Myxine and of Bdellostoma . . 130 



762. Myxine glutinosa, dissection 131 



763. ,, auditory organ . .... ... 132 



764. Bdellostoma, kidney . 132 



765. PaliBeospoiidylus gunni ... . 133 



766. Chiloscyllium modestum . ... 135 



767. ,, vertebras . . 137 



768. ,, skull . . 138 



769. ,, visceral arches .... .... 139 



770. ,, pectoral arch and fin ... 141 



771. ,, pelvic arch and fin . . . . 141 



772. ,, lateral dissection 143 



773. ,, branchial sac ... . ... 144 



774. ,, blood-vessels 145 



775. Scyllium canicula, brain 147 



776. Chiloscyllium, brain . . 148 



777. Scyllium canicula, cranial nerves and brachial plexus . . . 150 



778. Chiloscyllium, oviducts .... 152 



779. ,, right kidney and urinary sinus . ... 153 



780. Dog-fish, egg-case . 153 



781. Cladoslache fyleri . 154 



782. Pleuracanthus ducheni .... .... 155 



783. Acanthodes wardi . .... 156 



784. Lamna cornubica .... .... 157 



785. Urolophus cruciatus . . 158 



786. Centrophorus calceus, dermal denticles . . . 159 



787. Scymnus, spinal column .... 159 



788. Urolophus testaceus, skeleton 160 



789. Heptanchus, skull 16 



