PERillAN PrODUCTINAE AND StROPHALOSHNAE OF W.A. 
21 
.sometimes impressed by a median sinus, sometimes regularly curved trans- 
versely; the striae varied in hexuosity and in the number of spines borne 
on the body of the valve. Each of these varied independently of the others, 
except possibly that the flexuosity of the striae was correlated with ihe 
presence of spines, one or more uniting, a spine arising at the point of union 
.and the striae then disassociating. 
Interiorly the dendriiic adductor impressions of the pedicle valve are 
elongated and parallel to the median line while the diductor impressions are 
.short, broad and longitudinally striated, arising at the loAver edge of the 
adductors. The brachial valve has a raised median septum, adductors 
dendritic on each side of the septum, reniform impressions running laterally 
from the base of the adductors, following the lateral and antero-lateral 
margins, then returning to the point of origin. Cardinal process trilobed, 
median lobs raised above the two laterals. Marginal ridges arising at the 
base of the cardinal process and continuing along the hinge to the ears. A 
hollow separating the ears from the visceral disc, runs obliquely from the 
base of the cardinal process. 
Remarks, — Diener in 1911, after examining a collection of Linoproductid 
shells from the Fusulina Limestone of Kehsi Mansani suggested that P. coru 
d’Orbigny should be enlarged to include those forms previously assigned to 
the species P. neffedlevi Verneuil, P, corriigatus McCoy, P. prattenianus 
Norwood and Pratten and P. Uneatus Waagen. In this collection were forms 
which, Avhile they could not be separated from the type specimens of these 
.species, formed a continuous series with the specimens of undoubted P. cora. 
Diener’s conclusions that P. cora included a wide variety of forms has since 
.been strengthened by Kozlowski's work on the topotypes of P. cora. Koz- 
lowski regards P. prattenianus and P. Uneatus as members of the ‘^cora'^ 
species group. He adds, too, P. ovaius Hall, but thinks that there is a 
'detinite, if unimportant, distinction between P. cora and 1\ corragaPus in 
that in the latter species the spines arise on any striae at its confluence with 
several others whereas in P. cora it is usual for the same stria to bear several 
s})ines at different places along its lengtli. 
These two authors have each had access to a large lutmber of specimens 
and have, each independently of the other, found that P. cora is a very 
variable species and includes in itself P. Uneatus, P. prattenianus, P. neffedievi 
and P. ovatus. The conclusion of such men, working with good material 
must be accepted, and even while these groups may be distinguished by 
varietal names, it must be rememl)ered that they all belong to the one species 
■group — Prodnctiis cora d’Orbigny. 
Australian Bistrihution. — This species has been previously recorded and 
figured from Tillighary, N.S.W., by de Koninck. The specimens were, how- 
ever, burnt in 1882. Other references to this species in Australian literatiu’e 
(Etheridge jun. 1872, P]theridge and Jack 1892, and Etheridge and Dun 
1909) are not included in the synonymy of the species as in all the specimens 
figured the concentric markings are strong on the pedicle valve, a condition 
not showui in any of KozloAvski’s or Diener ’s figures. These S]iecimens* have 
not been (examined, and consequently no ojiinion is expressed on the validity 
of the identifications. 
Productus cora has been recorded from Western Australia by Chapman 
:and Glauert (1910, p. 87), It was recorded from the Kimberley District by 
