103 
There is a thin brown epidermis; the ornament consists of 
Be lines and a few distant 'growth- folds and obscure 
radial lin 
U mbo- Ventre T „ 2:25; antero-posterior diam., 2; sec- 
tional diam., 1:2 
Derwent Meurs RC EU (W. L. May). 
Comes nearest to C. polita, Tate, an Eocene species, but is not 
produced anteriorly. it differs from C. Atkinsoni by its acutely 
trigonal outline, and is not so convex. 
Carditella pectinata, spec. nov. 
Triangularly oval, inequilateral, rather convex. ntero- 
dorsal margin straight and steeply inclined ; post-dorsal margin 
convexly sloping to the narrow rounded posterior side; ventral 
margin slightly curved, distantly crenulated w 
bones obtuse, prominent, approximate, ‘deat consider- 
ably in front of the centre. 
Colour yellowish-brown. The ornament consists of numerous 
(fifteen or more) radial broad ridges (most conspicuous anteriorly), 
separated by linear sulci; and intersected by growth-lines 
Umbo-ventral amis 15; ; antero-posterior diam., 1:5; sec- 
tional diam., 
Derwent (Rep Tasmania ( W. L. May). 
Genus Thraciopsis, nom. mutand. 
Alicia; Angas, 1867, non Johnson, 1861. 
T 
ype :—7. angustata, Angas (sp. 
New South Wales, Tasmania, and South Australia. 
