APPENDIX. 281 



Two Sub-divisions. 

 Division of f True Mollusca, 

 MOLLUSCA. \ Molluscoida. 



Five Classes. EXAMPLES. 



"Cephalopoda- Cuttle-fish, Octopus, Cala- 



mary. 



Pteropoda - Hyalea, Clio. 

 Sub-division of the 1 Gasteropoda - Snails, Slugs, Whelks, Cow- 

 TRDE MOLLUSCA. | ries. 



I Acephala - Oysters, Mussels, Ship- 

 worms. 

 LBrachiopoda - Terebratula, Lingula. 



Two Classes. 



{Tunicata - Biphora, Simple and Com- 

 pound Ascidians. 

 Bryozoa - Plumatella, Alcyonella, Es- 

 chara, Flustra. 



Two Sub-divisions. 

 | Globular Zoophytes. 



From this distinction result corresponding terms or zoological ana- 

 logies, of which I subjoin a table that has been drawn up in ac- 

 cordance with the present state of science. 



Monoecious Verities (sexes 

 Dio3cious Verities (sexes separate). united in the same individual). 



Annelida ----- Lumbricini. 



Rotifera 



Grephyria (?) - ... 



Malacobdellae - Hirudinei. 



Miocoeles .... Turbellariae. 



Nematodes ----- 



Cestoides. 



For further information regarding the question of the two series 



the reader may consult my memoirs on the Polyophthalmia, and on 



the nervous system in the Leeches and Earth-worms (Ann. des Sc. 



Ndtitrclles, 3 e serie, t. xiii. et xviii.), as well as Van Beneden's 



work, entitled Les Vers Cestoides ou Acotyles. 



