Mr. J. Hogg on Tentacular Classification of Zoo\)hytcs, 367 



mals as have their tentacula studded with minute projections, 

 knots, or nodules, which are also said to be sometimes fur- 

 nished with Httle bristles or setae ; for example, the Hydra 

 and the Sertulariadce, The order 3 embraces the genera 

 Gorgonia, Pennatula, and others, whose animals retain well- 

 defined pinnae along their tentacles. But in order 4, we have, 

 I believe, as yet discovered only one genus, Coryne : here the 

 tentacula are furnished at their tips with small glands. 



The second tribe possess tentacles unarmed, and quite de- 

 void of any projections or appendages whatsoever ; in which, 

 the order 5, Planitent acuta, comprising the Tubularice, exhibit 

 perfectly smooth and plain tentacula ; and the order 6, Tubif 

 tentacula^ y as \\\^ ActiniadcRy have their tentacles hollow, per- 

 forated at both extremities, and much resembling tubes or 

 siphons. 



I must however beg distinctly to state, that I propose this 

 classification merely as an attempted, but by no means as a 

 perfect one ; because there may, not improbably, occur other 

 variations and forms in the tentacula of even our British zo- 

 ophytes with which I am now unacquainted, and which may 

 necessarily lead to some modification in one or more of the 

 previous orders ; but for those of the foreign genera, some 

 additional orders will doubtless have to be hereafter insti- 

 tuted. 



From this systematic arrangement the Corallines and 

 Sponges are excluded ; because in the absence of all marks of 

 any animal organization, and of every distinct animal property 

 as yet discoverable in them, I must agree with Doctors Link, 

 Miiller, and Johnston, and several other distinguished authors, 

 in restoring them to the Vegetable kingdom. 



* Some one may perhaps be inclined to find fault not only with the no» 

 menclature here used, Zoophyta Ciliotentacula, Tuhitentacula, &c., but also 

 with founding a classification principally upon the variations and differences 

 which are discernible in one set of organs ; him I would remind of the Lin- 

 nsean arrangement of Insects, where he will notice Insecta Lepidoptera, 

 Neuroptera, and several more variations in the ptera or wings alone. And 

 I need scarcely add, that this arrangement of the immortal Swede will, in all 

 probability, long survive many of the modern systems, which are grounded 

 on the more numerous characters afforded by several organs. 



