Ill 



The most anomalous point is the position of the cells, or rather their mode of 

 opening on the surface. The frond is funnel-shaped, and the cells open towards the interior of 

 the funnel, as in /.'/<;//. Towards the upper portion of the frond, the cells seem to open 

 simply at the bottom of the deep grooves between the internal keels, and the fene-trules open 

 into thr same grooves, and there is, therefore, no special difficulty here. it'. a> seems tolerably 

 certain, the keel- are not here connected by an imperforate connectm- membrane, an 1 the 

 oves thus remain open to the access of sea- water ; m-ir the ba-e, however, the k.-el* are 



clearly connected internally by a ni'-mhnrie which has no perforations in it. and the deep 

 intervening grooves are Hlled up by a vesicular calc-amu- ti--ue. so that the -,-a-water could ii"t 

 have <jaiii'-d 800688 to the mouths of the cells. The only explanation that I can oti'.-r. is that t he- 

 basal portion of the poiy/oary may p.-rhap- have been gradually overgrown internally by thi- 

 layer of vesicular ti-.-u>-. and may thus have been practically killed, wlul-t the upper portion 

 remained open to the sea, and genuinely alive. It' this be not the case. I cannot explain 

 undoubted fact-. 



The enormous internal keels, whether free or connected together internally -ive an extra- 

 ordinary depth and thickne-< to the polyzoary. and the fen, -.-(rules do not extend to more than 

 about a fourth of thi> dc-pth. nor do the cells. In // 1'hill. i the fcm--truie- do n,,t 



extend through the entire thickness of the polyzoary, but in this genus the ten,-Mrui<-- ar- 

 confined to tin -urface of the funnel-shaped frond, and the cell- op , / IL l n 



Cry jil "]'"/'( Nich.; a-ain. the outer and inner surface of the poly/oary are both impi-rlorate, 

 and the cells open internally into a central space which is crossed by regularly-placed pillar-. 

 havini: a direction perpendicular to the plane of the frond. 



The following i- the only species of the genu- . which ha- come under m\ 



notice : 



134. CARINOPORA HINDEI (Nicholson). 



Cm Iliu-lii (Nicholson), Annals of Natural History, Feb. l>7l. 



Thi- bein'_ r the only -p.vi,-, ol ill,' _', mi-, it is unneee^ary to recapitulate its -tructurai 

 charai-t.-r-, -incf these, 80 far a- known, have been fully di-cii--cd above. It onlv remain- t , 

 _'ive the mi-a-un-iin nt- by which the specie- is distinguished, along with one m- two char 

 r- whieh are not of g'-ii'-rie value. The only known specimen exhibit- a portion of a very 

 large infundibuliform frond, which, tlmu-h fragmentary, ha- a hei-ht of four inehe-, with a 

 iliamet, r above of clearly more than half a foot. The actual base is br-'ken of}. About 

 branches occiip;, the space of two lines. The fene-trule- are .-nmetim.-- oval, -omeiim,., he\- 

 nal or polv^onal, and their arran-vup-nt diller- in dill', r.-nt parts of the fr.nid. Sonietini' - 

 they are ;irra[i---cl in regular diagonal lines; but even in thi- 0886 tin-re are often p, r 

 tible central longitudinal litn-s. on either -ide of which the dia-onal row- of fene-tru!<'- di\- 



in opposite directions, like the barbe of a feather, giving rise to a mo-t p.-enliar appeara- 



At other tinn- tin- f.-in--trule, are rhomboidal, lic\aL r onal. or poly-onal, and are not arran 

 in di.-tinet diagonal row- ; wliil.-t two contejuoii- longitudinal row- are olten -i-parate.l b\ an 

 unusu ally narrow and apparently quite straight branch \ See 1 'I'he >p.-u-e< ai 



whieli the fl.-xuoii- braneh- - ino-etii ale |ia\e a ilejith of about half a line, considerahly 

 iir_ r tin- widtli of the brain-In-- ; -o that whil-t -<-\--\\ leiie>t rule- oeeiipv a ijiiart<T of an inch 

 nn-a-ured diajonailv. only four occupy the same space me.i-ured longitudinally. 'I'he thick- 



tin- frond, m. -a me. 1 at i i-ht an-_'le- to it.-, plane of-r-.wtli, i- mil- liin-or a little n, 

 nearly two third- of thi- bi-in.' .aeeoiinted tor by the L.'1'eat internal ke. l.i-tl\, tl. 



i'-rally three cell mouth- to the len-th of a lem-.-trule, with two place, 1 ,.ppo-it,- tin- iin.M-u 

 lation of eaeh pair of eonti_'ii..u- branch) 



Tin- only kii'un xample of thi- .-in/ula: .1 b\ mv iriend. \\\ 



Ofaorgi JenOiO - Hinde, by whom it .!,mittt,l to me for examination, aiil in who-- 



honour 1 ha\-- named it. 



1 . l.ime.-toiie. .1 arvi-. ( 'oiint\ ( \\ . 



< i I I ill . 



I'o]-. .inpo-e 1 of iin-mbi-ainni- tl it ;,ni-i,,n-. u hi. -h either branch without 



anaitomoail OF, mop- typicillv, divide into bran, 'In-- whi>'h in : interval-, till 



'In n i, produced a broad frond p,-rt- ; .\ i m 



