120 EUG. DADAY DE DEÉS 
greath Australian Bight coll. D. Prof. R. Tate, descriptis 
D. St. G. Brady; Macumba et Stevenson River in Australia 
centrali, coll. et descripsit Prof. B. Spencer et T. S. Hall; 
Hay, N. S. Wales, coll. D. 4. Whitelegge, descripsit IL Prof. 
G. O. Surs; N. S. Wales, specimina e collectione Musaei 
nat. hist. Berolinensis examinavi. Species haecin Australia fre- 
quentissima inclusit secundum D. Prof. 2. Spencer et T.S. Hall 
varietates tres infra sequentes. 
1. Caenestheriella Packardi var. typica (Sp. et H.). 
Estheria Packardi v. typica Spencer et Hall, 122, p. 237; Sayce O. A., 112, 
p. 251. 
« Measurements of an average — sized specimen — Length 
of carapace 7,2 mm. ; heigt 5 mm., thickness through both 
valves 3 mm. Some specimens reach the length of 9 mm. Lines 
of growth about 24, well marked. Setae usually present an the 
lines of growth, but sometimes absent. Sars says none are 
present. The interspaces between the lines of growth are marsed 
with raised lines which are vermiculate in the umbone region. 
Towards the outer margin they gradually become more defini- 
tely arranged in a radiate manner as well defined straight lines 
with their inner ends branching and anastomosing. 
The carapace is more compressed than in the two succeding 
varieties, andits colour in spiritis chestnut-brown wit a broad, 
light band round the margin. 
The spines on the dorsal edge of the telson are numerous 
and fairly equal in size and shape. » 
2. Caenestheriella Packardi var. cancellata (Sp. et H.). 
Estheria Packardi v. cancellata Spencer et Hall, 122, P-2297; °Sayce (04; 
119 M2 A 
« Carapace very tumid. Measurements of average — sized 
specimen : — lenght 8 mm.; height 6 mm. ; tickness 4 mm. 
Lines of growth, 30-50, crowded towrds the margin. Setae 
rarely present except round the outer margin. The sculpturing 
of the umbonal portions of the shell ressembles that of var. 
typica. Towards the margin, owing to the crowding of the 
