156 Rev. T. Hincks's Catalogue of Zoojjhytes 



W. Peach ; and a few are given in Mr. Busk's ' Catalogue of 

 Polyzoa.' For the Zoantharia the great authority is Mr. Gosse's 

 * ActinologiaBritannica/ which furnishes a very large number of 

 Western localities. I have availed myself of all these sources of 

 information, so as to multiply the habitats as much as possible, 

 and to include some species which had not come under my own 

 observation. 



With respect to classification, I have found myself unable to 

 follow any single text-book. Dr. Johnston's work, admirable as 

 it is, and valuable and attractive as it must always continue to 

 be, has been left behind by the progress of science. Its classi- 

 fication is now obsolete. 



I have followed Messrs. Frey and Leuckart, whose views are 

 sustained by the authority of Prof. Huxley, in regarding the 

 true Zoophytes as constituting, with the Acalephs, a new sub- 

 kingdom — Coelenterata — embracing two classes, the Hydrozoa 

 and the Actinozoa. Of the former, four orders are included in 

 this catalogue, which are adopted from Huxley's great work on 

 the ' Oceanic Hydrozoa ' — the Hydridse, Corynid^e, Sertularidse, 

 and Lucernaridse*. For the second of these the name Tubu- 

 larid<B seems to me preferable, but the point is not of sufficient 

 moment to be insisted upon. 



Amongst the Sertularidse I have retained the genus Plumu- 

 laria as it stands in Dr. Johnston's work ; but there can be little 

 doubt that it ought to be dismembered, as suggested originally 

 by Prof. E. Forbes. From Campanularia I have separated th 

 small sessile or subsessile species (represented by C. dumosa) 

 with densely corneous tubular cells, and have constituted the 

 genus Calicella for their reception t- 



In the classification and nomenclature of the Zoantharia I 

 have followed Mr. Gosse J, and for the Polyzoa have employed 

 as a text-book Mr. Busk's admirable ' Catalogue,' the genera in 

 which have been constituted after an extensive examination of 

 foreign as well as British forms. 



I must not omit this opportunity of acknowledging the valu- 

 able assistance which I have received from my friend Mr. Alder 

 in the preparation of this catalogue. His extensive and accurate 

 knowledge and remarkable skill in the discrimination of species 

 have often been of essential service to me. 



I am also much indebted to the zeal and intelligence of Mr. 



* In conformity with the recognized principles of nomenclature, I have 

 altered the termination of two of Prof. Huxley's ordinal names from iadce 

 into id(B. 



t Rep. of Brit. Assoc, for 1858, p. 126. 



X The excessive multiplication of genera in Mr. Gosse's beautiful work 

 is much to be regretted. 



