LIST OF ILLUSTRATIONS 



705. Balanoglossus 3 



706. ,, anterior end 4 



707. Ptychodera bahamensis 5 



708. Balanoglossus, development 7 



709. Tornaria 8 



710. 9 



711. Cephalodiscus, gelatinous investment 10 



712. ,, zooid . . . 11 



713. ,, sagittal section 12 



714. Rhabdopleura 13 



715. Ascidia 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. Appendicularia 24 



723. ,, diagram 25 



724. Botryllus violaceus 25 



725. Composite Ascidian, diagram of zooid 26 



726. Doliolum 27 



727. Salpa democratica, 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 rnammillata 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 



