CHAPTER NINTH. 



CLASSIFICATION OF THE HYDROID^, 



SECTION I. 



TABULAR VIEW OF THE WHOLE ORDER OF HYDROIDiE. 



In order not to introduce questionable information in this synopsis, I have only 

 quoted such references as relate to the most trustworthy accounts now at hand 

 upon this type, and condensed these to the utmost, sometimes to the mere names 

 of the genera and species, as the special papers on this subject, already enumerated 

 in preceding sections, must necessarily be consulted by all those who propose to 

 investigate the Hydroids and their alternate generations. 



Order of HYDR0IDJ3 Johnst. (So extended as to include the majority of the 

 naked-eyed MedussB and all the Siphbnophorse.) — Lithophyta and Zoophyta 

 (pro parte) Lin. — Zoophyta (p. p.) Pallas, Ellis and Sol, Flem., Dana. — Polypi 

 (p. p.) Cuv., Lamx., Link., Milne-Edw. — Anthozoa (p. p.) Ehrenh. — Radiaires 

 anomales and medusaires (p. p.) Lmk. — Medusse (p. p.) Per. and LeS. — 

 Siphonophora3 LeS. — Acalephes libres (p. p.) and Ac. hydrostatiques Cuv. — 

 iEquoreaj, Physophoraj, and Porpitae Goldf. — Vesiculares, Medusaj (p. p.), Chon- 

 drophorse, and Anomala) Cham, and Eysenh. — Papyracea, Hydrostatica, and 

 Cyclomorpha (p. p.) Latr. — Discophor* cryptocarpae (p. p.) and Siphonophorae 

 Esch. — Polypiaria (p. p.), Physograda, Pulmograda (p. p.), and Cirrhograda, 

 DeBl. — Siphonophorae and Discophorse (p. p.) Ohen. — Discophoros (p. p.) and 

 Siphonophorae Brandt. — Medusa3 (p. p.) and Diphyida?, Polytomte, Physophorae, 

 Physaliaj, Velella3, and PorpitfB Less. — Gymnophthalmata Forbes. — Hydroidae 

 Agass. — Coralliaria Tabulata and Rugosa, and Hydraria Milne-Edw. and Haime. 

 — Hydromedusae (p. p.) and Siphonophorae Vogt. — Hydroidea and Hydro- 

 medusida Kdll. — Hydroidea, Medusida Craspedota (p. p.) and Siphonophora 

 Gegenb. — Hydroidae MeCr. (exclud. ^ginidae). — Hydrozoa Huxl. 



VOL. IT. 43 



