;3(J2 APPENDIX. 



Class A. Hydrozoa.— Walls of dig-cstive sac not separated 

 from general Ijody-cavity ; re]iroductive organs external. 



Sub-class I. Hydroida (Hydroid Zoophytes).— OcJe/s 4 ,• 1. 

 Hydrida. Ex.: Fresh-water Polype (Hydra).— 3. Corynida. Ex.: 

 Pipe-coralline (Tuljularia).— 3. Sertularida. Ex. : Sea-firs (Sertnlaria). 

 —4. Medusidse (.Jelly-fishes). Ex.: Traohynema, ^Eginida. Page 58. 



Sub-class II. Siphonophora (Oceanic Hydrozoa). — Orders 2: 

 5. Calycophoridae. Ex. : Praya.— 6. Physophoridas. Ex. : Portu- 

 guese Man-of-War (Pliysalia). Page 73. 



Sub-class III. Lucernarida (Sea-blubbers).— Orrfer,s 5.- 7. Lu- 

 cemariadse. Ex. : Lucernaria, Hidden-eyed Medusic— 8. Rhizo- 

 stomidae. Ex. ; Rhizostonia. Page 76. 



Sub-class IV. Graptolitidse (extinct).— Page 80. 



Sub-class v. Hydrocorallinse. — Ex. : Millepora, Stromatopora 

 (fossil). Page 81. 



Class B. Actinozoa. — Stomach opening Ijelow into body-carity, 

 but separated from body-walls by "perivisceral space," which is 

 divided into vertical compartments by " mesenteries," to which re- 

 productive organs are attached. Orders 4 ■ 1. Zoantharia. Tenta- 

 cles round, in multiples of six. Ex.: Sea- Anemones (Aetinida'), 

 lleef-building Corals, Corals with central axis. — 3. Alcyonaria. Ten- 

 tacles fringed, eight in number. Ex. : Dcad-jnen's-fingcrs (Alcyonium), 

 Organ-pipe Coral (Tubipora), Fan-corals (Gorgonidai), Heliopora. — :!. 

 Rugosa (extinct). — 4. Ctenophora. Swim by cilia. Ex. : Pleuro- 

 brachia, Venus's Girdle (Cestum). Page 83. 



SUB-KINGDmi ni.—ECHINODEBMJTA. 



Marine organisms, )>ilaterally symmetrical wdien young, pentamerous 

 arrangement of pai'ts in adult. Alimentary canal separate from body- 

 cavity; water-vascular system employed in locomotion ; nervous sys- 

 tem radiate; integument hardened by lime spicules or plates. Orders 

 7: 1. Echinoidea (Sea-urchins). Ex.: Sea-eggs (Echinus). — 3. As- 

 teroidea (Star-fislies). Ex. : Cross-fish (Asterias), Sun-stars (Solaster), 

 Cushion-stars (Goniaster). — 3. Opbiuroidea (P>rittle-stars). Ex. : Sand- 

 stars (Ophiura), Brittlc-.stars ((.»pliiocoma). — 4. Crinoidea (Sea-lilies). 

 Ex.: Feather-slars (Comatula), Medusa-liead (Pentacrinus), Stone-liiy 

 (Encrinus). — 5. Cystoidea (extinct).— fi. Blastoidea (extinct). — 7. 

 Hploth.uroidea (Sea-cucumbers). Ex.: Trepangs (Ilolothuria). Page 

 97. 



SUB-KINGDOM IV.—ANNULOflA. 



Elongated body, bilaterally symmetrical, divided into segmontf. 

 which are arranged along an autero-posterior axis. Lateral appenj- 

 a,ge sometimes present. Nervous system in antei'ior part of body or a 

 double gaiigliated chain placed vertically. Page 112. 



