cups in different directions. True parietal gemmation, on the other hand, I have never 

 noticed to occur in this specif-. As 'a similar mode of increase exists in OystiphyUum 

 vest' . as ' ccuring in the Hamilton Group, and as it has not. BO tar as I know, been 



observed in the examples of //. ILilli from the (,'ornit'erous Limestone, it seems possible that 

 it is a habit of growth induced by some peculiarity in the surroundings of the coral such, for 

 instance, as the slow but regular deposition of fine clayey sediment. 



//. liophytt U very closL'ly allied to //. (Jana . and 1 ^hould be inclined to doubt 



if any distinction of importance between the two species can be maintained. Large examples 

 of //. // >/ '". >uch as occur in the Corniferous, are separated from //. ' by tin -ir more 



shallow calice, the comparative cl'<- 38 ; ' e -"ptal stria', and their cylindrical or cylindro- 

 conical form ; but young specimens of //. II<t/li are often very broadly expanding and turbi- 

 nate, and the intervals between the septal spines and striae do not appear to be ci>n-tant. 



Small examples of //<7/</y< //</// have a length of half or three-quarters of an inch, 



with a diameter of calice of from three quarter- of an inch to an inch and a quarter. 1. 

 examples may have a length of from tire to six inches, with a diameter of calice of two inches 

 and a half. There are also more cylindrical .-pecimen-. apparently not M parable from this 

 species, which may have a length of two Inches or over, with a diameter of calice of not more 

 than from three-quarters of au inch to an inch. 



Loc'iliti/ mill Formation. Corniferous Limestone of Port Colborne ; Con. 1, lot G, Wain- 

 fleet; II :.le. Extraordinarily abundant in the Hamilton Formation of Ho.-anqiiet, a 

 the course of the Riviere aux Sables. Also in the Devonian Limestone of Devonshire, 

 England (Phillips, and Edwards and Haime). 



19. HELIOPHYLLUM si;i; -< .KM'iiusr.M (Nicholson). 



// /i<i]i/ty/[- -'///* (Nicholson), < M ":iite, Feb., 1874. 



Corallum, small, simple or compound, cylindrical, or slightly expanding towards the 

 Ar ptal -;ri;e and spines from a third to aquarter of a line apart. Calioe oval 



or circular, .-hallow. Septa apparently sixty in number, at a diameter of ei-Jit lines. Kpi- 

 theca with numerous annul itions ,-ind constrictions of growth. ( ' 'I'll 



in liv'nluals. \vith the other characters oft lie spec! ir to be simple, 



but the majority of examples increase by the production <!' lateral buds, 

 new coraliite.- ihu- produced are l'e\\- in numbi-r (generally ii"t more 

 than one. two, or thnvj. ;md are directed upwards nearly in the dm 

 of the parent corallite. hi Mime cases ealirular -einiuation app* 

 occur. 

 //. wan has a genera] re-emhlance to Cyatliophyllw 



, of ( ! old t'u-.- ; but the piv-eiiee n f \\vll marked sept al .-t ri: am 1 -ept al 

 spine to lie a true // m. 'I'hf latter species also i- 



eii-nlated or I'Stra-ilbrni." and inerea-e- prineipaliy by ealieular jem- 

 mation ; whena- //. sub-( ! m never produces sufficient bud- to 



form itions of any size, and the inerea>.- i- principally by lal 



-eiiiiiiatinn. It i>. further, distinguished from the other forms oi ; 



, i: i-oiiiparatively .-mah 126, it- evlinlrie:il torm, and it- mode 

 .!' -rowili. //. ' \ . i inerea-i- in the same way. but i- a 



m ucl i l-ii- er ipecies, and is diutio nished by other characters aa well. 



MI_' in>li\ iduals n|' //. m are u-ually -t ro- Ittlattfd 



with in-' iowtb-wel : ,.[ ha\e a len-ih of from li.ilf an inch 



ineh. witli a diameter at the cup of from two to three lines. 1 



individualB have a length of trcm two to three inehe-, \\ ith a diann't.T of 



ealiee of from ri'jlll to ten \\i, 



" Format* n. Common in the Hamilton 1-Wmaiion at 



I I'.arll'-tt'- Mil \rkoiia. in llie Township of I io-aiiqiiet 







l^lt. llr.l.lul'IIVI.I.l \I I'KUI.III KIM ( Nieliol-on . 



i lalluiu I ir_'i-, -impli or "inp'iund. gTOWJ -tally in particular localities, \vl 



nuiii'1-...i- individual- occur together nearly in contact thoii-h not r. anieally conn, e 

 Form ej.linilric.,1. wiih num. r u- irregolu gpTOWth-IWllillgl in the m.ijoi ity of in.-iaucei. 





