ver, 



at present 



accept his' views with regard to the limits of this species. It Beema pretty rtain. t., hejn 

 with, that the forms included by Goldfuss (I'ftr f. I'l. XXV 1. Piga I - - -n under tin- mine 

 of /'. basaltica differ from oue another in their character- to -uch an extent that they w-uld 

 UMiai'.'. - they actually have been) separated int., two di-tinei species, < >n tin- one hand, 



makinlr the existence of a single row of mural pores the distinguishing character of the 

 <!ul.ll'u>3 includes under this head forms which differ only in thi.- character from / 



and on the other hand he associates with the-e f,.rins which differ very widely from 

 F. <>' Ihiandica in mot of their characters, but which are believed to a_rrec with the preceding 

 in the above mentioned feature. We may, therefore, consider that /'. basaltica <>f Goldfusswaa 

 made originally to include the following two -maps of specimen- ; 



1. Specimens agreeing with .F. &0di2 i. " , in possessing prismatic oorallitefl,ihe 



> of wliieli is upon the whole generally uniform, hut whieh differ i'rom /'. ' in 



.it a single row of mural pores. (l'<ti->f. I'l. XX \ I ., Piga 



2. Specimens whieh a -Tee with the preceding in having -"inetimes (not always) a .-in-le 

 row of pores, but which differ iu having nearly rounded or cylindrical eorallites. the .-i/.e- of 

 which are exceedingly unequal ; whilst the place of complete tabuhr- i- taken by numerous 

 short projecting lamellae, which impart a peculiar and characteristic appearance to the inner 

 Mil-fa.-' llites. - Pi . I'l. XXVI.. Pigs . t&). 



Now, it is the tir.-t of the-e groups of -p<-cim--ns that palaeontologists 1 dly 



agreed in re-ardiri'_ r as the tvpe form of Gold.); and the chief difference 'f 



..pinion has simply concerned the question whether these forms are separable firom /'. G ! i<'a 



HOt. Some authorities, .-uch as McCoy \ Lonsdale, maintain, apparently with 



1 reason, that the-e forms are truly referrihle to /'. ' . whilst others, Mich as 



Milne Jviward- and Ilaime. retain these form* under a separate species under the name of 



Whichever of these views may he ultimately adopted, I. at any rate. h. 



no specimen- from the ( 'nrniferou- Lime-tone of Western Ontario whieh appear to me to be 

 truly referrible to the type here alluded to. "We do meet, certainly, with specimens exhibiting 

 prismatic ba-altiform tubes. in every respect resembling /. '/ thli " .'.except that the c -ral 

 . n the average a little -mailer, and they exhibit but a sin-le row of mural pore.-. 'I ! 



! wa- at tii--! - ; -_ht di.-|o-. d to .-et down as li-lon-iir_' to /'. / / alKca, and 1 have 



: them -o n-imed b. -. 1 have, how, \er. succeeded in fully sati-fying my-, If that 



imens in (juestion are truly decorticated examples of /'. /'// Billings), in which 



there is also but a sin-le row of pore-. Kxaniple.- of this sj.eeics can he I'-und with the cliar- 



ri.-tic epitheea in all sta-,*' and at all de_-ive- of removal ; and when it has entirely di-- 



2i]ipear.-d, ail the character- <>l this tir-t -rctioti of /'. /.,/.(///-' ((iold.), are a-nm,-il. the only 



Distinguishing mark, perhaps being that the walls of the eorallites have the comparatively 



it thiclxiie-s which is characteristic "f /'. turbinata. It need i,nly be added m this con 



lion, that unmistakable examples of /*. '/<//</.'/.</< " not uneoinmonly exhihit. a.- lias been oi'ten 

 noticed bv oth.-r observers, )!: -inudc ro\\- of pore.- which (loldfn beli.'Ved to b NT 



i-tie of /'. ' . thoii-h 1 am not aware that any colony of /'. ' hi- . . i 



d in whieh nil the corallit. : 1 hut one row of mural p, i 



\\'.' have now to con-ider the other -n.up of -],,cinien- included b\ (JoldfiH- under the 

 id of / . fa '<'< '. namely, tho-e in which tlie eorallite- are more or L circular or eylindri- 

 d in shape, and are very nne,|iial in -i/.e. whil-t th>-\ ], (her | , culiarit : v\,-ll. 



'J'h' iinen- v. 'd from /. I altlCQ by Milne Mdv, ard- \ Ilaime. nnd.-r the 



i mi, of / 1'Ht ih,\ were subsequently reunited \\ith tlie j r,,-, din .!,, uj, of 



form- b\ Mr. Hilling-, tlie name i. I |,,r the combined ^1 '. 



opinion, EU I h a\ , alread\ -aid, is tint the colonies \sitli ,-mall, nearly uniformly -i/.ed. t 

 malic and onipOrOUS COrall .-urin_' in the (',,! Lime-ton, . are i 



d,-corlie:it,-,| , xamples of /. ',,, BilHl I. therefore, am at pr. -, nt .i i In 



b>lir\e that /. I :v. .V 11. .in,. 1 ].,,-i< i.ib!. I'lMin the 



type I, .rin of / ptril (tlioiudi ineludiiiL' J>art of ' 



< i.i 1 '! and I shall describe under tJ t .up ,.t -j.eimens to which l 



have di .ei 



