s;, 



arranfremcnt, some of the shell? referred by Hall to M ' //</ will be consid- T. d here under 

 the head of >/'///'</< /</. whilst others will come under . 



The f-pecies of ^ . as here undcr-:o,,d. which have come under my notice in the 



Devonian Kocks of Ontario, are three in number, viz. : 5 

 s -itttlii. :md ,b'. /'<// 



102. Sl'IKIilKRA SPIIUKKROII>K> (EatOD . 



T ' ' ' Katon i. An. ' - , Vol XXL, p. 137 



A' Com . . Anmi.-il Keport en l':il. New York. p. 111. 



.! , Il.-illi. la-port !'. iii-th l>i-t.. Ne\v \ ork. p. 198, Ki- .".. 



Spirigera spn H-'ii . T. nth II' port on tin- State Cabinet. ].. 1 



S ' - i;iiiin_- . ' J . N v i.. p. i-i~ . r 



and "> t-57. 



.//A-// II Jl), I'.-il. New York. V..1. IV. Plat, XI. VI. Pigs. 5-31. 



[('( nn pare N/</, ' of Kup.pean pal.-e.>nt'.' 



Shell tran-v.r-ejy sub oval, -ub orbicular, or -uh-'|uadrate, with it- .vidth i 



the middle, slightly truncated anteriorly, or more commonly having tin- IVunt uiarL'in JTH- 

 duced into ;i tc.n-ur-hapfd rounded j'rnjcctinn. Ilin-v line \cry >h"rt. the cardii ini- 



tii- ruiindrd ,,fi'. Both valves convex, but not excessively BO ; th-' v.-ntral valve with a shallow 

 nn'-i.-il simiE which dies out towards tho beak : the dnrsal valve with a enrre-j.i.ndiiiL' in---ial 

 fold. The beak of the ventral valve incurved, and jierl'nrated by a small but (.i.n>|'ieuous 

 foramen. I>nr<al valve more convex than the ventral, with a small rounded beak which i- 

 concealed beneath that of the ventral valve. Stirfacejmarked by close -et c,.ne,-ntric lines of 

 LTnwth. which are often produced into imbricated thin lamelhe, and which are alway> more 

 crowded toward-; the front margin nf the -hell. 



The interior of the ventral valve exhibits two -ir"n^ dental 1-unel; ;he 



ba-e of the rostral cavity, where the muscular inn . The interior"}' the 



dorsal valve exhibits a strong cardinal )' with elevate,! socket-margins behind, and a 



narrow elliptical mn-cular imprcs-inn which is " divided by a lnw median cr.-t ' i Hall/. Tho 

 spire.- ?hc>w abi'iit fifteen turn- each. 



Whether 5 Ivit.pii, is identic.--! witli Spirigcra (Athyr 



il'.ronn.) f'rnm the |)e\i,nian Etocks of Europe or not, i.- a ijiic-tinn which I have i\ meai 

 decidiu'_'. not having at present BCO( t" authentic -]< cini'-n- of tlie latter. I .-hould, h> 

 be -trmi^ly incline.l to think that the t wo fnrm-. a- beli.-\cd by I >e Venn-nil, Sharpe, Millii 

 and other-, are in reality idi-ntica! ; thoii-h. in deference to th-- view.- of Professor Hall. I 

 have retained our form a- a -eparate -j ecie-. In anv 'i -uj-po-in/ th<- two |. 



-ame. the naiue ,,t \\ili bave to be retained, afi ha\ini: the priority ovi-r tha' 



' 



18 of rare OOOTirrenoe in the C-.niifer..n- l,im---toiie. but i- found commonly 

 in the Hamilton _ roiif.. ( >ur -p-cini-n* pr-----nt IP. -jeeial ]--cu!iarity except that, will 

 exception. BO tar a- I 1 M. the\ are -mailer than tli.-e from the -am-- formations in tin- 



3l te "t N'-w York. Thu-. the ; MUCH iii our collection ha- onl\ a widtli of nine 



lines, and a length of eighi lim- : wb. im--n- from N. \\ N'-ik sometimes have a width 



ol nearly an im-h and thn-.- .jiiart- i -. and a len-th of an inch and a half or i ..... 



/ nl it, i ,n, 'I I ' 'ornili-roii- Li me- tone. 1 1 erBvillc j I lamilt-n < in.ui . \\ 



and Hartlett - Mill- near Ark'-na. in < T wn-hip ,-f BosanqQi . 



MI.".. Si'ii:n,i:i:\ EtOSl i: \ i \ i llallj. 

 Hall 1 '- -port on the I'niirlh < ' Disl V u V,,rk. p 20 . I' 



Hillin-j ' New 8 \ : \ i 



i:; ii 



H /' ' ) \ ' l\ I'!.'- I.. Pi 13 17 



Shell -mall, o -ub altcnii II 



(lie ventral BCaroell ni'.f' --. than the dor \".-ntral \al\-- n, the mi-l'llc. 



ii-nallv with a -hallow roiind.-d m< ial -inn- in front, winch, h-.\\. 



prominent, iii'-nrv' d over ' ill' 



it and p' t ' HOH- forani'-n. I>"r-al v.ilv.- r< /n : ar ;th 



