61 



and there are irroups of corallites slightly lartrer than the ordinary ones, and separated by 

 intervals of about a line and a half. From four to five culiees in the space of one line. 



This species is very closely allied to ('. <;.>l'lf>i^i > Kdw. :m<l II. i. but i- distinguished by 

 the fact that the ealioefi arc markedly polygonal, instead of beiii'j circular or oval, and that 

 they are sub-equal, with very few -mailer ones inter-per.--d amon-.-t them, when-a-. in the 

 latter species, there are intercalated amount the ordinary ealicc- a number f exceedingly 

 minute ones. FMIU the well known CfueteteS tumiduS of the Carboniferous rocks, again, the 

 present specie- i- di-tin-uished by tin- p.ily-onal shape of the calices. their thin walls, and 

 their much larger rise, the corallites of the former being thick-walled and nearly circular, and 

 there being about eight nf them in the .space of a line. 



Loro/it'i 'iifi formation. Not uncommon in the Hamilton group, at Widder, Township 

 of Bosanquet. 



7l'. ClI^ETETES QUADRANOULARIS (Nicholson). 



w ruadrangularis (Nicholson), G>-<>li,<ii<;il .!/<"/</ :/'//, Feb., 



Corallum forming thin crusts of from one-tenth to one-sixth of a line in thickn 

 Corallites sub-equal, with very thin walls, about eight in the space of one line, for the n, 

 part polygonal, but often quadrangular in shape. The -urfaee i- -month, and destitute t 

 eminences, nor are there groups of larger corallites regularly interspersed among-t the smaller 

 ones. 



This species is found commonly encrusting // 



'////// //'////. and often forming expansions of con- 

 siderable extent, but apparently never 'iiip"-ed ol 

 more than one layer of corallites. It is di-tingni-hed 

 from C. tutu i-'-i'l<ifii.<; (Kdw. and 11.) by the -mailer 

 size of the corallites. the absence of distinct emitien 

 ces or gihl.o-.itie- of the surface ( mamelons, ' a d 

 the very commonly quadrangular form of the eal: 

 L,<),;ilihi ini'l formation. Not uncommon in the 



Hamilton group of Bartlctt's Mill-, near Arkoiia 

 a. Portion of the crurt of < .n,'i"lnf> > i , i> 



,,,,- upon Heliophyl _i,th T Own-hip of Bnsaiiquet. 



illy c-nlar_ 

 t'r,,in Uif Hamilton '_ 



Genus CALLOI-K\ < Hall). 



Corallum compound, ma--ivc, encrusting, nr ranm-e, the corallitc- minute, tubular. 

 separated b> a -till more minutely tubular <-,e:ienelivnri. '1'he OQBnenohyma alwa\s r.-ndercd 



M-ular by tran-VT-e diaphragms, and the eorallites al-o u-ually tabulate. Septa rudin. 

 tary or ab-.-nt. 



Tin- genu- Gattopora iin lii'le- a number of coral-, which range from the I'pper Silurian 

 (Niagara gnuip to the I i.-viinian. and which, in -ome in~t am-e--. have deeidedlv tin- a-pe.-t of 

 /'///.' The afliiiitie- of the geiiu- are. however. be\ond all .|Ue-tioii. BO far at anv rat.- 

 the specie- which liave cuiue under uiv ob-,-r\ atinn are eoncerned. ''' . beyond all 



doubt, i- a genii- of Tabulate C'iraU. and lind- it- IP illi.-s in the genera //- '. -'.' and 

 /' ' ' Kroiu the f.,niier .!' these, Co p-irat- d by the ab-.-ni-e of -.-pta. and 



from tic- latter ley the fact that the tubuli of ( he erneneh ym a are regularlv tabulate, whil-t 

 tin- ci.r,illite~ them-, is,-- h r/e til,- tip ea either npeii, ,.r partitioned oil" by feu remote l,,.ri. 

 tal tab', 



One large species, uhidi perhap- may subsequently be found to admit ..!' Mihdivi- 



intn two. ha- in, ! to me in th, Corni 1 ' rmi-. Lime-tone and Hamilton |-'ormatioii of \\ 



tern ( Intario, and thi-i- eerj d' irl) di-tinct from all pr.-\ i , e,.rded Im': 



\ i \ Ni.-hol-mi). 



L 



Siol ' logical Maga/.ine, .Jan 1-71. 



Oorallum sometimefl enorusting foreign b-di, . Mmetimei forming]. <>i 



i in constituting large In-iui-pL' n.- ma--e- which an , ,im|,,,-. d of num.! 



