LIST OF ILLUSTRATIONS 



PAGE 



FIG. 



705. Balanoglossus .... . . 3 



706. ,, anterior end . . ... 4 



707. Ptychodera bahamensis . . . . 5 



708. Balanoglossus, development . . . .7 



709. Tornaria .... ... .8 



710. „ . 9 



711. Cephalodiscus, gelatinous inve.stment . 10 



712. ,, zooid .... 11 



713. „ sagittal section . 12 



714. Rhabdopleura . 13 



715. Asoidia 15 



716. ■ ,, anatomy .... . 16 



717. „ mesh of branchial sac ... .... 17 



718. ,, diagrammatic longitudinal section ... 18 



719. „ transverse section 19 



720. „ dorsal tubercle, ganglion, and associated parts . . 20 



721. ,, sagittal and transverse sections ... 21 



722. Appendioularia . .24 



723. ,, diagram . . 25 



724. Botryllus violaceus 25 



725. Composite Ascidian, diagram of zooid . . . .26 



726. Doliolum . .27 



727. Salpa democratioa, ventral view . . . 28 



728. ,, lateral view . . . .28 



729. Pyrosoma . . .... . . . 29 



730. ,, part of section ,. .29 



731. Salpa, lateral view of ganglion 31 



732. Ascidian, mature egg ... 32 



733. Development of Clavellina, early stages ... 33 



734. ,, ,, later ,,.... 35 



735. Larva of Ascidia mammillata . . . . . 37 



736. Metamorphosis of Ascidian, diagrammatic . . 38 



737. Doliolum, tailed larva .... .39 



738. ,, asexual stage, lateral view . . . 40 



739. ,, ,, ,, dorsal ,, 40 



740. Salpa, late stage in development .... .41 



