202 
few concentric wrinkles of growth near the margins. When the frontal 
sinuosity is very strongly pronounced the front is folded so as to produce a 
design rather like a capital W, with slightly rounded angles. In 1851 I 
gave the name T. vesicularis to this form ; and Morton has figured it under 
the name T. homdens. 
Sorizon and Localities. — Among the Australian fossils I found only 
two specimens of this variety ; one comes from Eurragood, and the other 
from Stroud, where it is associated with S. trigonalis, Martin. 
Variety 2, having for its type : 
Teeebratula hastata, Soiverhy.^ 
PI. XV, Fig. 3. 
This variety is generally elongated and oval, with a rounded or slightly 
sinuous front. The valves are more or less convex, equally deep, and rarely 
having sharp edges. The ventral valve is generally slightly depressed or 
sinuous towards the front ; in some specimens this depression extends higher 
and reaches almost the half of tlie total length of the valve ; its beak is rather 
thick, and though recurved, rises perceptibly above that of tlie dorsal valve ; 
the extremity of the beak is truncated rather obliquely, and pierced by a 
large, rarely circular foramen, the lower part of which is continued in the 
form of a small canal beyond the beak of the dorsal valve ; its deltidium is 
very small and scarcely percej)tible on most of the specimens ; in the interior 
are two diverging hinge teeth. The interior of the dorsal valve is ornamented 
with an apophysis like that of living TerehratuUdce, and which scarcely 
extends beyond one-third of the length of the shell. The whole external 
surface is smooth, or simply ornamented with undulations, as in the variety 
T. cymhceformis, or with concentric rings of growth, as in T. hastata properly 
so called. The shell is perforated, but the perforations are extremely small, 
and rather regularly arranged quincuncially. In the Australian specimens 
I have noticed no traces of colouration such as some European specimens 
show. 
Horizon and Localities . — According to McCoy this species is common 
in the sandstone at Muree, Raymond Terrace, Adiere it rras found by Messrs. 
^{Dielasma saccuhis, var. hastata, J. de C. Sby. E. Etheridge, Jiinr., Geol. and Pal. Q’land., 1S92, 
p. 226.— W.S.D.] 
