162 REPORT— 1881. 



divisions are of supreme importance, and the Palaeontologist may do well 

 to carry over the leading idea of Smitt and Hincks when working out 

 fossil species, especially so when dealing with Palaeozoic types. It may 

 be well, too, to caution the student in his use of the generic names of the 

 earlier authors. These have to be revised according to modern usage. In 

 every case where I could retain the original designation of the author of 

 genera and species I have done so, but it seems to me to be folly to 

 perpetuate a nomenclature which does not indicate generic affinity. In his 

 otherwise carefully written 'Introduction,' Mr. Hincks says, 'There is 

 evidence, however (as I learn on the excellent authority of Mr. R. 

 Etheridge, Jun.), of the existence of a few Cheilostomatous genera at 

 least within this epoch (Palaeozoic), and probably the group is represented 

 in the Silurian division of it ' ' — a conclusion, which after the most 

 careful research, I am unable to agree with. 



In this, as in my former Report, I shall revise the whole of the genera 

 and species that have been introduced since the time of Goldfuss into the 

 nomenclature of Silurian and Devonian literature. I would prefer to 

 deal only with British species, but as many papers describing new genera 

 and species, from foreign sources, have been published in this country, I 

 cannot do otherwise than review, if not revise, these as well. But 

 whereas, in my former Report I dealt generally with material in my own 

 cabinet, in this I shall refer largely to the Polyzoa in the magnificent 

 collection of the School of Mines, Jermyn Street. For this purpose I have 

 handled, and noted down particulars of every specimen in the collection, 

 from the Lower Silurian to the Devonian. This I have been enabled to 

 do through the kindness of Mr. Etheridge, F.R.S., and Mr. E. T. Newton, 

 Assistant Naturalist of the School of Mines. 



Professor Duncan has expressed a wish that in this Report I should 

 draw up a suggestive Terminology, that would be in keeping with modern 

 usage and applicable to Palasozoic species. In accordance with the spirit 

 of this request the following terms may be accepted generally. In it I 

 have followed the leading of Busk and Hincks, without wholly neglecting 

 the terms used by our leading PaljBontologists. 



ZoABiUM. — ' The composite structure foi'med by repeated gemmation,' 



= Polyzoarium and Polypidom of authors. 

 ZocECiOM or cell. ' The chamljer in which the Polypide is lodged.' 

 C(EN(ECIUM. ' The common dermal system of a colony.' Applicable 

 alike to the ' Frond,' or ' Polyzoary,' of Fenestella, Polypora, 

 Phyllopora, or Synocladia : or to the associated Zooecia and 

 their connecting ' interstitial tubuli,' of Oeriopora, Hyphas- 

 mapora, and Archffiopora, or species allied to these. 

 Fenestrules. The square, oblong, or partially rounded openings in 

 the zoarium, — connected hy non-cellular dissepmients, — of Fenes- 

 tella, Polypora, and species allied to these. 

 Fenestra; applied to similar openings, whenever connected by the 

 general substance of the zoarium — as in Phyllopora, Clathro- 

 pora, and the Permian Synocladia. 

 Branches. The cell- bearing portions of the zoarium of Glauconome, 

 Fenestella, Polypora, or Synocladia ; or the off-shoots from the 

 main-stem of any species. 

 Dissepiments. Bars which connect the branches of Fenestella, &c. 



' JBrit. Mar. Poly., p. cxviii. Aiiding in a note ' Of recent genera Stomatopora and 

 J)instopora appear to occur in the Silurian Eocks.' 



