08 
Dorothy Hill. 
bases to form lamellar septa, in the form of stripes on the corallite walls,, 
appears to be the higlujst numb(U’ possible in PscMdofavosites sttjlijer var. 
septosa (tertli (1921, p. 104, f)I. cxlviii., tip^s. 7, 8) from Dasleo, and this num- 
ber is usually attaimsl. Dut this ^(nms is without tabulae. 
? Thamnopora s]). (Plate I., fig. 10; Plate II., fig. 10). 
Ma/erif(l: One s})ecinion, c-olleeted by C. Teiehert, from Callytharra 
opri ngs. 
J)esGnpff.(m : The (*orallum is partly encrusting, extc^nsi orm but of 
crum])le(l growth, with stumpy branches on tlui upp(u* surface, which has 
been f>itfed by rain weatlua'ing. Its si/*e is fiO x 00 x 15 iutii., tlu‘- branches 
IxOng mostly bi-oken oil at a heighl of 5 to 10 mm., and Ix'ing alxntt 8 mm. 
in diaiTiietei’. 1 h(.> corallites an* uiHXjuat, up to 2 or 2*5 mm. in diauK'ter, 
'Tlio walls of tlio corallitfss in the brancluis an; nnu-h dilatinl, but those in the 
basal layiu's and in tlie paits iit which the branches ar(> se4> are thin. The 
walls of th(‘- corallit(!S in tfn> ax<^s of tJu^ branches are also thin. Wluai ana- 
lys<xl mi(*roscopically, tlu^ dilatation is seen to b() septal in origin ; the indi- 
vidual tra,becula(^ (.>f (xich s<>pfinn are dilatixl ajid in contact so that laiiKOlar 
so])ta a,r(^ formed, fiom the axial (xlges of whicli denticulations may never- 
th(iless arise ; and tJie dilaf<ation is so gi’oa.t that ntaghbouring septa ar(i in 
contacjt latX'rally, to form a, dense wall. number of the septa per corallite 
is unknown. ''Fhe calic(%s probably open obli(juely to the surfac(! of the 
branch, but t-his is iinpi’oved. Mural ])or('S ai'o numerous, and oc(uir l)oth 
betwtuai and pita’cing tfie s('j)ta. 4^11)0010 an** distant aTid very thin. 
Mentarhs : hi its manner of growth this sp(H*imen resembles some of 
the Diwonian AlinioUies, but the weatlu^ring does not ])ermit us to study the 
outliru' of the caliees. It may p<‘.rhaps represtait tlie basal portion of the 
branching Thamnopord irusGulpta , but further knowltxlge of the number of 
septa and oblicpiity of corallites is needed before this may be regarded as 
more or less than a [lossibility. 
1 AMITY CLADOCHONIDAE. 
OonuH CLADOCHONUS M’Coy. 
('ladochonus APCoy, 1847, p. 227. 
Monilopora Nicholson unci Kthcriclge, 1879, p. 2911, genotype Jania crasm M’Coy, 1844,. 
j). 197, Lower Carboniferous of Ireland. 
Cladochonus ; Hill and Smyth, 1958, j). 129. 
Genolectotype (chosem bklwards and Haimci) : Cladochomts tc.nuwollis 
MXJoy, 1847, p. 227, pi. xi., figs. 8, I^ower Carboniferous of New South Wales. 
IHmjnosis : Corallum compound, with a re])tant ring of c^orallites proxi- 
mally, from whicdi free branches arise ; individual corallites arc^ trumpet or 
pipe-shap('d, and in contact only at tlui point of origin, cuich giving rise to 
anotlnn* by lateral inc-rt^ase througfi the wall of the exfianded calico ; each 
has a thick peripheral stc'rcHi/.ono of laminar, sometimes reticulated scleren- 
chynni ; luntlun- tabulaci nor sejital spines art' stx^n in tlio narrow lumen, but 
longitudinal (? septal) ridgcis may ajipc^ar in the calicos. 
Remm'ks : Hill and Smyth {loc. ciL) have shown that the genotype of 
Monilopora was but the reptant portion of a coral whose free branches are 
Jania bacillaria M’Coy, a species of Cladochonus, and that Cladochomis has 
