APPENDIX. 



281 



Division of 



MOLLUSCA. 



Sub- division of the 

 Trde Mollusca. 



Two Sub-divisions. 



f True Mollusca. 

 \ MoUuscoida. 



Five Classes. 

 Cephalopoda - 



Pteropoda 

 Gasteropoda - 



Acephala 



Examples. 



Cuttle-fish, Octopus, Cala- 

 mary. 



Hyalea, Clio. 



Snails, Slugs, Whelks, Cow- 

 ries, 



Oysters, Mussels, Ship- 



|_Brachiopoda - Terebratula, Lingula. 



Two Classes. 



fTuuicata 

 Sub-division of the! 

 MoLLuscoiDA. j Bryozoa 



Biphora, Simple and Com- 

 pound Ascidians. 



Plumatella, Alcyonella, Es- 

 chara, Flustra. 



Division of the 

 Radiata or 

 Zoophytes. 



Two Sub-divisions. 



Radiated Zoophytes. 

 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. 



Dioecious Vermes (sexes separate). 

 Annelida 

 Rotifera 

 Grephyria (?) 

 Malacobdellse 

 Miocoeles 

 Nematodes 



Monoecious Vermes (sexes 

 united in the same individual). 



- Lumbricini. 



Hirudinei. 

 Turbellarise. 



------ 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. 

 Naturelles, ^^ serie, t. xiii. et xviii.), as well as Van Beneden's 

 work, entitled Les Vers Cestoides ou Acotyles. 



