33 



constrictions of growth ; they may be straight, or more or less flexuous ; and they vary in 

 their distance apart. The epitheca is marked with numerous extremely close-set and delicate 

 encirclim: strife, together with more or less conspicuous vertical striae, which mark the posi- 

 tion of the septa within. Occasionally, the corallites are united by lateral connecting pro- 

 cesses derived from the epitheoa, -imilar to those which characteri-e the ircnu.s ri'lji/n/l/mn ,- 

 but these processes are always remote, and are only an occasional feature. The septa are 

 from forty to forty-two, alternately large and small, and rardv encroaching upon the central 

 tabulate ana. The tabula; are regularly depressed and bent downwards as they pa.-- through 

 the outer vesicular zone on their way to reach the margin ; but they are sometimes more or 

 flexuous. Increase of size, so far as I have observed, seems to be always by the production 

 of lateral bud-, but it is possible that calieular gemmation sometimes occurs, and Air. Billing 

 state.- that bifurcation of the corallites takes place occasionally. 



Very commonly the corallites of this species have attached to their surface the singular 

 adnate coral which I have described under the namo of ./ / ,^ni(l) L\in'iden<ix, alum: with 

 the tube.- <>t' a specie.s oJ 5 



/. / and Formation. Common in the Corniferous Limestone of Port Colborne, and 

 Lot 6, Con. 1, Wainfleet ; also " in various localities in the townships of \Valpole, Oneida. 

 Cayuga, and Waiufleet " (Billings). 



DlPIIYPHYLLUM STRAMINEUM (Billings). 



/ 



(l'lateV.,Fig. 6.) 



I>'/i/ii/l>/>i/f/n/n xtrumimum (Billin nadian , '. X< \\ Series, Vol. iv . p. 135. 



(i iompare Diphyphyllvm gracih (McCoy), British Pal. Foss. p. 88, lig.-. /, e, /). 



'' ( 'uralluiu forming large masses of cylindrical tubes, avera-in^ two lines in diameter, and 

 either so clo-elv a- jivjatod as to be nearly in contact, ! separated from one another bv int'-r- 

 vals of I nun one to five lines, the distance varying in diH'en-nt e!n-ters and in different parts 

 of the same. Sometimes numerou- -in-1 tu ir -cartercd through the rock, which were 



probably derived from some disintegrated Lrroup. The tube- are either -trai-lit or flexumis. 

 smooth, or annulated by short eifciroling fold- of L_TOW;|I. tin- -urf.ice striated longitudinally 

 by th'- - of the septa. The latter are about forty in number, and do not ivaeh the 



centre. Tip- tr.m-ver-e diaphragms are well developed, sli'_ r litly convex in the centre, and 

 appear to } -nddenly turned down en approaching the unrniii. Tlie outer ve-ieular area i- 

 tliin. --idnin exceeding one-sizth nt'the whole diameter. The central area altogether occupied 

 by the transverse diaphragms ; sometime* in well-piv-erve.l -p.'eimeux. the >epta mav be - 

 extending about half way to the centre, upon the -urface of some of (he diaphragm-, but in 

 _'enera! they are confined to the outer area. In the more d'-n-e colonies, the corailite- often 



inosoul and are -onietiiues conneeied by lateral processes, as in the species of the .-ub 



Iilliir_'-j. 



1 doubt if the di-tilictlie--, i.f thi- -pi-cje- from J >//>////J'/l I///HUI <//<'</'' (3Ie( ', he 



maintained. 'I'he distinction Lrivn l.y >lr. Hilling'- 1 i- that the septa of the latter are | 

 riatel , . rge .-Hid -mall, wlii-re-i- in l> ttfOn ' they are all nearly e.jiial in -!/..; but it m-v 

 I' '|T -'i ..... -d if thi- cli-tinction would be alone -ullieieiit to -eparate the two fnrin- \' an\ 

 rate, I have found in the Corniferuu- hiiue-tone, a number of specimens which a-reewitl, 

 .'. in mo-t respects, and which 1 .hall, therefore. oV-eribe unlertlrit name. 



/. ',Uy awl Formation. --Common i-, the Gorniferona l.im' -tone ,,f |',.i-t Colhonie 

 Lot M, Con. I, \V.,ii,ll 



_'-. I ijiMivi-in-i.i i M I.K M 1 1 i. i \i. ' 



(I'late V. 1 



' M'-('oy), Brit. I'** 1 . /' , p. 88, fi-s. ( /, . 



Corallum forming' colonie, ,.\' eylindrieni. ! ,(. or ll.-xn 'he .liaii: 



\\bich .!!,'- from two to throe line*, being must C'>mmonl\ aliont I wo lines and a half Sin: 

 with annul it ion- of -row I h, and vr; n- ii iin- - m u kin.^ the po-iiiim ol' the -ept.i. 'fl.e-e hu ter 



3 



