` 
Pycnoidocyathus maximipora (new species). Fig. 9. 
The type fragment is part of a nearly cylindrical. cup. 
The outer surface shows annular bulges 20 to 25mm. 
apart, the inner surface remaining cylindrical. The in- 
tervallum varies from 12mm. in the bulges to 6mm. else- 
where, the central cavity being 25mm. across. The septa 
are straight, about 50 in number and 2mm. apart. The 
outer wall is a spongy network, which is 2mm. thick in 
the bulges, but does not reach anything like the thickness 
seen in Pycnoidocyathus simplex (Taylor). The septal 
pores are oval, very large, and numerous. The inner wall 
has very large pores, 2mm. across, leading upwards and 
inwards into the central cavity. 
Another fragment of a similar but larger cup, which 
must have reached 80mm. in doameter, has an intervallum 
of 25mm. It agrees with the foregoing іп most respects, 
but the spongy outer wall terminates externally in a more 
definitely porous layer than that shown in Fig. 9c, the 
pores being about .25mm. diameter and closely set (two 
to the mm.) Possibly this is the normal form of. outer 
wall for the species, 
Family COSCINOCYATHIDAE (Taylor). 
Cose:nceyathus rugosus (new species). Fig. 11. 
A rapidly expanding cone; intervallum coefficient 2mm.: 
15mm, giving a very small central cavity. Septa six- 
teen in number at 6mm. diameter, but only twelve reach 
the inner wall. The outer wail has two or three vertical 
ridges to each intercept, directed outwards, the hollows 
being occupied by vertical rows of small pores. two 
tabulae exposed are 1.5mm. apart. The material is in- 
sufficient to define further detail. Only one specimen has 
been found. 
Coscinocyathus papillatus (new species). Fig. 12. 
Conical tube; intervallum coefficient 4mm.: 7mm. 
Pores of outer and inner walls about equal in size, three 
to 1mm. Outer wall pores three alternating rows to in- 
tercept. Inner wall pores two alternating rows to inter- 
cept; each pore has a little tooth or papilla projecting in- 
wards into central cavity, giving the inner surface of the 
wall the appearance of a nutmeg grater. Septa 32 in 
number at 15mm. diameter, about 1.5mm. apart; numer- 
ous fine pores. "Tabulae 3 to 10mm. apart; numerous fine 
pores. Three or four specimens have been found. 
Coscinocyathus textilis (new species). Below Fig. 11. 
Gently tapering cone in lower part, rapidly expanding 
above. Intervallum coefficient 2mm.: 8mm. Septa about 
40 in number at 14mm. diameter, about 1mm. apart in 
expanded portion; numerous fine pores. In one specimen 
dissepimental tissue is present. The pores of outer wall, 
two to 1mm., are polygonal, two rows to an intercept, 
often with an internal vertical ridge between the two 
rows; these pores are much larger than those of the inner 
wall an unusual feature which is characteristic ot the 
Species. Pores of inner wall very small and numerous, 
tour to 1mm, : 
Coscinocyathus quadratus (new species). Fig. 10. 
Conical; intervallum coefficient 3mm: 7mm. Septa 
very numerous and close, .7mm. apart, with numerous 
fine pores. "Tabulae also very humérous and close, .5 to 
1mm. apart, numerous fine pores. The tabulae are there- 
fore as close as the septa, giving a loculus square in tan- 
gential section; this is the only Australian Coscinocyathus 
having this feature. Outer wall; two or three rows of 
very fine pores to the intersept. Inner wall not well seen; 
thick, with two rows of irregular pores to intercept. Only 
one specimen found. 
Coscinocyathus Petersi (new species). Fig. 13. 
Conical, with sharp vertical flutings to outer wall, giv- 
ing a stellaie cross section, which is the characteristic 
feature of the species; intervallum coefficient 2.5mm : 
4mm. Septa eighteen at 9mm., numerous fine pores. 
Tabulae 2.5ram. apart, numerous fine pores. Outer wall; 
each interecpt projects strongly to form a sharp vertical 
ridge; fine circular pores. Inner wall; fine horizontal 
shelv.3 project upwards and inwards into the central cav- 
ity; a horizontal row ot very small pores between each 
pair of shelves. Only one specimen has been found, but 
it is very clear and well defines the species; it was identi- 
fied by Mr B. J. Peters, technical assistant to the Kyan- 
cutta Museum, after whom we have named it. 
Coscinocyathus retifer (new species). Fig. 14. 
Conical; intervallum coefficient 2mm : 4mm. Septa 20 
in number ¿t 8mm. diameter. Tabulae remote (? 10mm. 
or more apart), thin; very numerous small pores. The 
outer wall has about five rows of very small pores to in- 
tersept, four pores to 1mm. The inner wall is thick with 
one or two rows of rather large pores to the intercept, 
two pores to 1mm.; two pores often coalesce to form a 
horizontal slit with bars above and below. ‘The finely 
porous outer wall at once distinguishes the species from 
C. australis (Taylor). Only one specimen found. 
Coscinocyathus cribripora (new species). Fig. 15. 
Lower part a tapering cone, upper part expanding to a 
broad nearly fiat rim, 100mm. across; intervallum coeffi- 
cient 2mm : 7mm. in lower part. Septa about 32 in 
number at 11mm. diameter; numerous fine pores. Tabu- 
lae 3 to 5mm, apart; numerous fine pores. The outer 
wall has two rows of large pores to the intercept, each 
pore being closed by a thin plate with about seven minute 
perforations; this is a distinguishing feature of the spe- 
cies. The inner wall has one or two rows of large circu- 
lar pores to each intercept in the lower part; two rows to 
each intercept in the rim. The species is very scarce. 
Coscinocyathus Cellularis (new species). Fig. 16. 
Long tapering cone; the wall in our specimen is folded 
inwards in a long vertical fold, encroaching largely on 
the central cavity; intervallum coefficient 4mm : 13mm. 
"Septa very numerous, (тата. apart; minute pores arrang- 
ed in about 14 vertical rows in each septum. Tabulae 
very numerous, 1.5mm. apart; very numerous minute 
pores. Outer wall; two rows of small pores to the inter- 
cept; there are indications that the pores are covered by 
a thin membrane with very minute pores (compare С. 
cribripora). The pores of inner wail are slightly larger 
than those of outer; they form an irregular mosaic with 
little or no trace of lineal arrangement, and each fits its 
neighbours so as to leave only a narrow partition between | 
them. Very scarce species. 
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