Mr. J. Hogg on Tentacular Classification of Zoophytes. 365 



POLYPARIA. 

 Section I. Simplicia. 

 Family I. Corallinoidea, 

 Order I. Vesicifera. 



Genus. Sertularia (of the old authors). 

 Order 2. Tubifera. 



Genus. Tubularia. 

 Order 3. Cellifera. 



Genera. Cellularia and Flustra. 



Family II. Coralloidea. 

 Order 4. Porifera. 



Genera. Cellepora and Millepora. 

 Order 5. Stellifera. 



Genus. Madrepora. 



Section 11. Composita. 



Order 6. Corticifera. 

 Genus. Corallina. 



Family III. Creatoidea, 



Order 7. Osculifera. 



Genus. Alcyonium. 

 Order 8. Gelatinifera. 



Genera. Spongia and Spongilla. 



It will be obvious to every one acquainted with Ellis's work 

 on Corallines, that the first three orders correspond with, and 

 are nearly the same as, the primary divisions of that author ; 

 viz. 1. Vesiculated Corallines ; 2. Tubular Corallines ; and 3. 

 Celliferous Corallines. And indeed, the above, if considered 

 solely in relation to the British Polyparies or the inanimate 

 and unorganized habitations of the animals — or as they have 

 been aptly termed Polypidoms by Dr. G. Johnston — may 

 perhaps prove to the student as useful an arrangement as any 

 other which has hitherto appeared. 



Next, in pursuance of the second method of classification, 

 and which most zoologists will at this day coincide with me 

 as being the only true foundation for the systematic arrange* 

 ment of zoophytes, I here venture to classify them according 

 to their tentacles {Tent acuta) ; which organs, considering their 

 structure, their great use, and functions, I have, for several 

 years past, accounted as presenting the best and most natural 



