25 



septa and filled up interseptal loculi with the dissepiments of the first-mentioned series. In this 

 way is produced a succession of vertical ridges and intervening sulci crossed by numerous 

 curved or sharply-zig-zagged encircling riiL 



The species of // urn which have been described by Mr. nillin-s as occurring in 



be Devonian Bocks of Canada are //. A'/v //.-., //. Cayv . ff. H. <m, 



II >.!;< I'l'in,, //. J,',i/i;, and II. latum, the first five from the Corniferou- formation, and 



the last two from the Hamilton >hal. -. All of these, except //. /. /< turn, have come 



under my notice as occurring in the Corniferous Limestone of Western Ontario ; and I have 

 also some new forms to record. 



15. I'lELioPim .I.I'M CANADENSE (Billings). 

 (Plate V. F i- 1.) 



Heliophylluf < -<'. Billing. Canoa*wn JWrnoZ, new series, Vol. FV. p. 125. 



Corallum simple, turbinatc. Septa between ci-hty and nyi.-ty at a diameter <>f an inch 

 a half, carry in-- on their Hat suriares sin n- : ,icl,.il stiiii-at distanoi - of from two -thirds 

 line to one line, and on their free edires blunt spines placed at similar distance-. I. in! 



rona sh irp-eii^ed encircling fold.- and annnlations of growth. "In the bot'om ,.f the 

 cup the septa reach the centre, and are there twisted touetli. r SO as to form a somewhat solid 

 ated pseudo-columella, around which there is a deep space occupied only by the septa. 



iL 



1'imensions varying from two inches up to half a foot or more in length. On- :nen 



in a perfect state of preservation mea-ured two inches and a half aloni: it.- convex curvature, 

 h and a ijii:irter alon<_r its concave curvature, the diameter ol' the cup h-'ii:-- a little 



.aid one inch and a ijii: 



r an inch and a half : and other .-peeinn-ns are still more broadly expanding. Thi 

 iiaps, tlie common I "f // ;/"j>!i i/llmn in the Corniferous Limestone of Western 



iada. [t is closely allied to //. C (Billings) and J?. fettt (Edwards and ilain. 



ditlerinir from the I'oi-ni'-r elii tlv in not liaviiii: a smooth space at the bottom ot the cup. and 

 in the lact that the arched septal >tri;i- are on the whole a little nearer together; whil.-t it is 

 di.-tih-ui-hed i'l-niii the latter by it> generally .-mailer dimen-ions, and by havinu' the >ej,tal 

 spiri'-- mid stri:e more v< mote. 



Ad-.-rilinir to .Mr. Hillinirs, the epithec-i i- .-omeiiin -th. and there aj'pear- to 1 



sej-tal ! 



/.. . c ; . .,.-. I'm! Colboru ; Lot 6, Con. 1, Wain- 



fleet ; and otln i . a in V, i, ( lutario. 



. B UYLLUM <'m.i:'ii:NKMSK (Nichol-on. 



P] te V. l-i-_'. -I.) 

 // ' ' , (Nicholson) " Canadian Naturalist," Vol. VII. No 



rallum simple, cylindric-d. not 6X] mdiiiL' toward^ theealice. Septa sixty at a diameti-r 

 ifoni :i ll ' irrviriLT on their fl;ii eln-d -tri;i-at dislan 68 of from one third to hall 



:t line. Kpitheea with num. -r.iii-, r-oiiei d or sharp > d.' d eoiiMrictiin> and annulationi 



_To\\ 'ii A flat sp:'C.- at I lie lint tolll of ll.e cup. In the Centre . I'\S liieh the -rpta . Xtclnl. Clip 



de< tie unknown. 



Thi- -pcci,- i- .. irlv re) i! ! t.. -md // ' Bill l'iit it i- 



think, decidedly distinct It i- di-iin-.ui-li.il from //. ' l>y it- cylindrical and not 



br"id' lire/ form, tin- cup being equal to or 1.--- than the diameter of thcem-il at a 



poi' e the base, I'V tin- II ittenin- of the I.Mtlom i.f the c'diec. |.y the 



-m ill' r niimh.-r of I iter oloBCnefiS of the an die | >.,], fal -tri:c 1'iom //. 



.the pr ii-hed h\ i' much -mailer thickn. -s, it- c\ limlrical 



(miii"' expanding form, the smaller number of septa, and the closeness of the septa) sti 



The length of /f ' mu-t h.. ..\erthre.-or four inch. -. hut H..MC ,,f my 



ire per' The dirndl-ion- of a Im-ken individual are: leii-th l\vo imdic- and :i 



half; diameter of hri't. one inch, diameter of cup t.-n lines , depth of CUp four Hi 



[n another, also broken men the length is two inohi and a . ( uari' : at the 



