80 BEPORT — 1880. 



Lis drawings and diagnosis of species are more elaborate. M'Coy adds no 

 fewer than tweh^e species of Fenestella to our British Polyzoa. They are 



F. pleheia, carinata, formosa, crassa, viuUiporata, ejuncida, frutex, hemisphe- 

 rica, Morrisii, oculaia, qiiadridecimalis, and varicosa. As I shall have to 

 speak of these farther on, I will leave the list without any further comment. 



M'Coy retains a few puzzling forms under the name of Gorgonia. These 

 are O. assimilis, Lonsd. ; G. Lonsdaleina, M'Coy ; and G. zic-zic, M'Coy. 



Another fenestrate genus, introduced by M'Coy, bears the name of 

 Ptylopora. There is a feather-like arrangement in this genus : a central 

 stem giving off lateral branches which are connected by dissepiments 

 having oval fenestrules. Fenestella owes its expansion to the bifurcation 

 of its branches. Ftylopora very rarely bifurcates, there is a basal exten- 

 sion of the Polyzoary along the central stem. One species is recorded by 

 M'Coy — P. fhmia — but it is a genus that deserves to be more closely 

 studied than it has been. In naming some fossils lately for Mr. John 

 Aitken, F.G.S., from the neighbourhood of Castleton, Derbyshire, I 

 detected several small fragments of this beautiful genus. The broad 

 central stem, whenever fenestration was absent, might easily be mistaken 

 for a robust Glauconome. 



The Glauconomes, which M'Coy figures and gives a description of, are 



G. grandis, G. gracilis, and by his discoveries he extends the range of 

 Phillips' G. Ufinnata} 



The Vincidaria I have already repudiated, and the V. parallela, Phill., 

 which M'Coy accepts as a type, I have alluded to when describing 

 Phillips' species. The Berenicea megastoma, M'Coy = Biastopora, Mor. 

 Cat., will be placed in the genus Ceramopora on account of its many well- 

 marked characters.'^ 



Having all the material at hand for the work, I sball now discuss the 

 relative value of the genera and species introduced by various authors 

 since the publication of the volumes alluded to. 



Synocladia, King, 1840. 

 1873. Synocladia hiseriaUs, Swal., var. Carhonaria, Btheridge. 

 1877. Synocladia ? scotica, Toung and Young.^ 



The type of this genus is very peculiar, and as it is well illustrated in 

 King's Permian Fossils, once seen it can hardly ever be forgotten. ' The 

 corallum is cup-shaped, with a small central root-like base : reticulated, 

 composed of rounded narrow, often branched interstices, bearing on the 

 inner face from three to five alternating longitudinal rows of prominent 

 edged pores, separated by narrow keels, studded with small irregidar 

 vesicles alternating v/ith the cell pores.' The essential characters of this 

 genus I have underlined. 



In the 'Ann. and Mag. of Nat. Hist.,'^ Mr. Robert Btheridge, Jan., 

 described a ' peculiar polyzoon from the Lower Limestone Series of 

 Gilmerton, under the name of Synocladia carhonaria.' An almost identical 

 form had been previously referred, by Mr. Meek,' to Synocladia hiseriaUs, 

 Swallow.^ After very minute investigations, kindly supplied to him by 



' Up. Devonian, Croyde, Pilton Devon, Phill., Paleozoic Fos. 



' See paper on BiaMoporidce, mihi ; paper read before Geo. Soc, May, 1 880. 



» Dates of publication and reading of paper. The (?) is Messrs. Yoiuik's. 



* Sept. 1873. 



' Paleontology of E. Xelraslia, AVashington, 1872. 



• Transactions of St. Louis Acad., 1858, vol. i. 



