119 



aperture. The aperture transversely oval, sub-elliptical ; the outer lip not reflected, and u. 

 ing the volution above nearly at rL'ht an<_ r le<. hut not prolonged further forward than the 

 lower margin of the aperture. No umbilicus. Surface cancellated with numerous revolving 

 and transverse thread like striae, the former about seven and the hitter three or four in the 

 space of one line. Between the concentric stri;*. 1 are numerou< liner stria-, having the -ame 

 direction, but so delicate that they can only be detected by the u-e of a hLh ma-nii'vim: 

 power. On the columellar side of the aperture the transverse striae radiate from a point, the 

 revolving striae running nearly parallel with the inner lip, and the cancelli arc nearly sqn 

 whereas elsewhere they are oblonir. The transver-e -tri:e have a m.>-r peculiar and chanu-t-T 

 i.-tic curvature ; sprin-iii'_ r from the suture above, they are directed obliquely backward- with 

 a dorsal concavity ; they then make a great curve of which the convexity is di iorsallv, 



and which is situated on the lateral aspect of the whorl, and then finally they are a-ain curv d 

 in the opposite direction, so that their convexities are directed towards the aperture. Whether 

 the form of the outer lip conforms to this curvature of the concentric strhr ha- n ! 1 

 determined. 



Heiirht of specimen, twelve lines; breadth, twenty lines. Height of aperture ten line- ; 

 width nt aperture, fourteen lines. 



Tin- species, whether rightly referred to StrophoatylllS or not, appears to be distinguishable 

 bv its peculiar form and the characters of its surface-ornamentation. 



A " ' (if 'Ui'J {'"Tnxd'titH. (.'orniferous Limestone of Port Colborne 



147. STROPHOSTYLUS OBLIQUUS (Nicholson). 

 (Plate II., Figs. 11, ll/o. 



Shell obliquely elliptical, its height being to its width nearly as one to three. Spire 

 -mall, >li'_ r htly elevated ; volution- thive or four, rapidly increasing in diameter ; the b< 

 whorl Lrreutly expanded. The volutions of the spire are -imply rounded and convex. but tlie 

 body-whorl is obliquely flittem-d above, so that its upper -urt'ace join- tin; \nlution ab 

 almo.-t at an anje of l>o. Suture- ohscuivK eanaliculated. I'ndcr -urfai-e -IL'htlv hol- 

 lowed out ; a -mall umbilicus. Aperture obliquely ovate. slL'htly an^nlated above ; it- lieijht 

 m-arly doubii- it- width ; the oiit.-r liji thin, tin- nilumellar lip unknown. Surt'ie.- cancell 

 with .-tron_' revolving -tri;e. ami much liner ami more clo-ely -ct tran-ver-.- -ti 



ll'-ijht of -pccimcii, aiiout e : i:ht line- ; width, ei-hteen lines; height of aperture, tuur- 

 width of aperture, nine line- or ! 



Thi- -jieei,-- i- iii-tinjui-h<-d from all other Bpeoies of Strophostylw, both by it- 

 el.araeter- and liv it- \erv jn-eiiii-ir obliquely-elODgated form. It would -cem to ! -omrwhat 



allied!- II;.... but a- ihe coluinella i- I.ol klluWII, it.- reference: - ,/Hj 



is rendered doubtful. 



/. '-, ;" rntntum. OoraiferonB Limestone, Port Colborne. 



<!: 11"! i'|'K. \ I Hall i. 







"Shell conic-il, vi-ritrieo-i'. more ,,r lesfl "lili'|U-- i-r nearh dir.-ci apertur.- roiiinl 

 margin i-niirt-; -urt ice m irked by .-imple line ,-ur\ ed -tri.f. or cancellated ' .Hall, /' 



Vo\ I p i 



The limn- of ihe L'ciiu- ll" ! 'f -I can hardlv be ri^idlv d. -lined a- f.ir a- our prr-ent 

 knowled In 'ji-mTal form // clo-el\ -imil n to' and the eh 



i-ti. fiameni itimi o!' ihe 1..I inetiiie- pi.--.-nt in the foiiner. An iiml'il!' 



app'-ar-. to |,- usiiallv pre-eni in //,,/.y,../. and i> uni\i-r--i!!v ali-i-ir in but it 



M.metim.-- uaiitinj in the form r genOI al-o I'Vom >7/ ihi !'!- // i ... 



tinju -In-. | I,-, it- mo[-.- e]e\at--ii -pin' ii- iiirbinate torm. ami it- !-- \ cntrii-.'-<- ho,|\ whorl 

 and I. -- e\|, uided iperture 



The follow oies from the CorniibrouH Liineatooe of Ontario maj ' it .u \ 



aie provisionally, t<> tli.- /i-nu- // . / .^ 



