172 
JOAX Crockford. 
Genus MINILYA gen. nov. 
Fenestrellinae in which the branches show two rows of alternating 
zooeckiy one on each side of a slight median carina; nodes small, in two 
rows on the carina^ placed so that one node is lateral to each zooecial aperture; 
zooecia sub-triangular ; structure of the reverse surface as in Fenestrellina. 
Range : Upper Pennsylvanian to Permian. 
Genotype: Minihja duplaris sp. nov. 
A. Fenestrellina lennardi sp. nov.: Celluliferous surface of the holotype 
(No. 20948a, Univ. of Western Australia), x 10. 
B. Fenestrellina cacuminatis sp. nov. : Celluliferous surface of the holotype 
(No. 20944a, Univ. of Western Australia), x 10. 
C. Minilya duplaris sp. nov.: Portion of a thin section of a specimen from 
the Calceolispongia Stage of tlie Wandagee Series (Specimen in the University 
of Western Australia Collection), showing the double row of nodes and the 
arrangement of the zooecial apertures; the section has cut just above the level 
of the dissepiments, x 10. 
D. Minilya duplaris sp. nov. : A thin section of the same specimen, showing 
the shape of the zooecia, and, on the left hand side, some of the tubercles charac- 
teristic of the reverse surface of this species, x 10. 
E. Fenestrellina disjecta sp. nov. : Lateral view* of part of one branch of a 
topotype (Specimen 2793b, University of Western Australia Collection), x 10. 
F. G. Fenestrellina columnaris sp. nov.: Lateral views of two branches of 
the holotype, x 10. 
{Camera lucida diagrams.) 
Species belonging to this late Palaeozoic group have been de- 
scribed from the Upper Pennsylvanian of Texas and Kansas, and 
from the Permian of India, Timor, Kansas, Texas, Nebraska, and Eastern 
and Western Australia. A list of the measurements of some of the species 
