ing the base of a specimen of Coscinocyathus australis. 
Iwo concentric zones of lamellar tissue are visible, to- 
gether with a number of root-like columnar outgrowths. 
Fig. 135 B shows details of the same specimen, 
Fig. 136 A, C, Plates XXXIV, XXXV, shows an Exo- 
cyathus from Carrickalinga Head, S. Aus. We are 
indebted to Mr. Sprigg for the specimens from this local- 
ity. The transverse section, 136 A, B, shows several 
irregular zones of lamellar tissue surrounding an uniden- 
tified Archaeo which shows septa, dissepiments and endo- 
thecal tissue. At A is seen a flat septate plate whose 
relation to the rest of the fossil is difficult to deter- 
mine. Details of the specimen are given in Fig. 136 B, 
Plate XXXV. Another Carrickalinga specimen shows 
Exocyathus forming a joint investment to a Proto- 
pharetra-like form and a delicate Coscinocyathus. 
Genus Paranacyathus (Paracyathus, Bedford 1936). 
In our second paper we described under the generic 
name Paracyathus a “small conical form in which. the 
base is filled with irregular trabecular tissue without 
inner wall or septa, the outer wall having small irregu- 
lar pores; within a short distance of the base clearly de- 
fined radial septa, inner wall and central cavity appear, 
and the small irregular outer wall pores are replaced by 
large and regular pores." Owing to pre-occupation of 
the name Paracyathus we wish to alter it to Paranacya- 
thus. Owing to the irregular base we placed this in 
the family Metacyathidae; the genus differs from Metal- 
detes, Metacyathus and Metacoscinus in that either outer 
or inner wall or both has regular simple pores in linear 
rows, whereas, in the other three genera, both walls are 
of irregular compound reticular type. We have since 
found additional specimens and also four other species 
which agree more or less with the characters of Parana- 
cyathus. 
Parancyathus parvus, Bedford, 1936. 
Additional specimens of this, the genotype, are figured 
in Plate XXXV, Fig. 137 A, G. The form is conical: 
intervallum coefficient of upper part 3 mm.: 9 mm. Septa. 
about 2/3 mm. apart; outer wall pores in a single row 
in each intersept, about four to 1 mm. vertically; inner 
wall pores for the most part apparently one row in each 
intersept; septal pores small and numerous. [n one 
specimen dissepiments are present, Fig. 137 G. 
New Species Paranacyathus margarita. 
Several fragments of this species have been found and 
are figured in Plates XXXV, XXXVI, Fig. 138 A—K. 
From an irregular cylindrical Archaeopharetra-like spitz 
Fig. 139 C is formed a small, rapidly expanding cone 
138 A, and this enlarges above into a large delicate bowl 
138 D, which may become so much convoluted that the 
outer wall lies within the curve of the inner wall, 138 
G. The circularly striated “pellis” on the spitz (middle 
"of Fig. 138 C) is often found on spitzes of the metacy- 
athina. The intervallum is narrow, only about 14 mm, 
and the largest fragment found indicates a diameter cf 
10 cm. or more for the expanded rim. The septa are 
34 
only 4 mm. apart, and numerous dissepimenis may be 
present, 138 D. E. F. Both walls are very characteristic. 
The outer wall has a single row of pores to each inter- 
sept and each pore is covered externally by a little 
stirrup shaped cap, 138 H; occasionally these caps coal- 
esce vertically to form stapiporous longitudinal ridges, 
138 J. The inner wall has a single row of stirrup- 
pores in the line of each septum, and semilunar pro- 
jections are present on the inner surface and may coalesce 
as horizontal ridges 138 I. One large fragment, in 
which the inner wall is for the most part normal, be- 
comes more irregular in places 138 K. Septal pores 
are absent, except for the stirrup pores at the inner wall 
138 F. 
New Species Paranacyathus regularis. 
This is a very scarce species; we have only found 
three small fragments of the expanded upper part. The 
lower part has not been seen, but it is placed provision- 
ally in this genus because of the general resemblance of 
wall and septal pores to the three species next described 
and because of the presence of dissepiments in one speci- 
men. It is figured in 139 A—E. The intervallum is 
narrow, 2 mm. The outer wall has pores regularly 
arranged, three to 1 mm., in two or three rows to the 
intersept. The inner wall has a single row of large 
pores to the intersept, the pores are rather wider than 
they are deep and are five to 2 mm. vertically, three 
to 2 mm. horizontally. The fragments are not suffi- 
ciently complete to be sure which is outer and which 
inner wall, The septal pores are large, oval and very 
irregular in size. , 
New Species Paranacyathus grandis. 
Only one fragment has been found, Fig. 140 A—D. 
The form is nearly cylindrical, about 22 mm. diameter; 
intervallum coefficient 7 mm.: 8 mm. The outer wall 
is thick, rugged and irregular, with irregular pores 
averaging four to 3 mm. The inner wall pores are 
regularly arranged in a single row to the intersept, three 
to 2 mm. The septa are nearly 14 mm. apart near the 
outer wall and have large irregular oval pores. Al- 
though the spitz has not been found, the species is placed 
with the Metacyathina on account of the irregular outer 
wall, and the large irregular septal pores, and in the 
genus Paranacyathus on account of the regularly porous 
inner wall. 
New Species Paranacyathus cortex. 
Only one fragment has been found. The spitz has 
not been seen and it is placed in this genus for the same 
reasons as given with P. grandis. The outer wall is 
rugged, but the ridges are finer, more regular and pre- 
dominantly vertical. The outer wall pores average three 
rows to the intersept and five to 2 mm. The shape 
appears to be cylindrical; intervallum coefficient 33 mm; 
12 mm. The septa are 13 mm. apart. The inner wall 
is thick, with a single row of regular and widely spaced 
pores to the intersept. Septal pores are large and ir- 
regular. See Figs. 141 A—C. 
