LIST OF ILLUSTRA-TIONS 



FIG. 



787. 



787. 



788. 



789. 



790. 



791. 



792. 



793. 



794. 



795. 



796. 



797. 



798. 



799. 



800. 



801. 



802. 



803. 



804. 



805. 



806. 



807. 



808. 



809. 



810. 



811. 



812. 



813. 



814. 



815. 



816. 



817. 



818. 



819. 



820. 



821. 



822. 



823. 



823 2 



824. 



825. 



826. 



827. 



828. 



829. 



830. 



831. 



832. 



A. Muscles and nerves of eye 



B. Pineal eye of Sphenodon 

 Organ of hearing 

 Section of Ampulla 

 Urinary tubule 



Diagrams of urinogenital organs 

 Development of mesoderm in Frog 

 Petromyzon marinus, external views of head . 



,, ,, skull, with branchial basket 



,, „ dissection of female 



,, ,, brain 



„ „ „ with olfactory and pituitary sacs 



,, „ development of olfactory and pituitary sacs 



,, „ auditory organ 



„ ,, transverse section of abdomen 



,, „ urinogenital sinus and related parts 



„ development ... 



,, sections of embryos 



,, fluviatilis, head of larva .... 



Head of Myxine and of Bdellostoma 



Myxine glutinosa, dissection . . 



,, auditory organ ... . . 



Bdellostoma, kidney . .... 



Palseospondylus gunni . ■ . . 



Hemiscyllium modestum . . . . 



Scyllium canicula, vertebrie . . . . 



Hemiscyllium, skull ... 



visceral arches ... 



pectoral arch and fin . . . 



pelvic arch and fin ... . 



lateral dissection .... . . 



branchial sac 



Scyllium, heart and branchial arteries ... 

 Hemiscyllium, blood-vessels ... . . 



Scyllium canicula, brain .... 



Hemiscyllium, brain . . .... 



Scyllium catulus, cranial nerves and branchial plexus 

 ns. ,, canicula, cerebral nerves 



,, ,, urinogenital organs 



Hemiscyllium, right kidney and urinary sinus 

 Dog-fish, egg-case ... 

 Cladoselache fyleri . . . . 



Pleuracanthus ducheni . 

 Acanthodes wardi ... 

 Chlamydoselachus anguineus 

 Lamna cornubica . 

 Urolophus cruciatus 



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