366 Mr. J. Hogg on Tentacular Classification q/* Zoophytes. 



forms and characters for that purpose. Although Dr. Arthur 

 Farre, by separating this class of animals into two divisions — 

 the Ciliobrachiate and the Nudibrachiate^ Polypi — first pub- 

 licly called the attention of the scientific world in his valuable 

 paper in the ^Philosophical Transactions^ for the year 1837, 

 to the importance of the tentacula, which he has named bra- 

 chia, with respect to a more correct classification of them. 



Class ZOOPHYTA. 

 Sub-Class I. BiNOScuLA. 

 Tribe I. Tentaculis armatis. 

 Order 1. Ciliotentacula. 



Genera. Flustra, Cellularia, Cellepora, Plumatella, &c. 



Sub-Class 11. Unoscula. 

 Order 2. Noditentacula. 



Genera, Hydra, Sertularia, &c. 

 Order 3. Pinnitentacula. 



Genera. Gorgonia, Pennatula, Alcyonium, &c. 

 Order 4. Glanditentacula. 



Gemis. Coryne. 



Tribe II. Tentaculis nudatis. 

 Order 5. Planitentacula. 



Genus. Tubularia, &c. 

 Order 6. Tubitentacula. 



Genera. Actinia, Madrepora, &c. 



A few observations for the sake of briefly explaining this 

 classification will be sufficient. The first subclass compre- 

 hends those zoophytes that are endowed with a higher and 

 more perfect organization^ and possess both a separate mouth 

 and a distinct anus, which is signified in the appellation of 

 Binoscula, As far as we are at present acquainted with these 

 animals, they all have their tentacles armed, or fringed, with 

 vibratory cilia. 



The second subclass includes the Unosculous Zoophytes, or 

 those which possess only a single hole or orifice, serving as 

 well for their mouth as their anus : they are by far the most 

 numerous. The order 2, Noditentacula, represents such ani- 



• These terms are both somewhat objectionable, as being likely to be 

 confounded with Ciliobranchia and Nudibranchia, names previously iu use 

 among the French writers. 



