114 
M. T. WARNE 
Genus Bythopussella gen. nov. 
Etymology. A reference to the family Bythocyprididae 
and to the possible affinity of the new genus with Pus- 
sella. 
Type species. Anchistrocheles aculeata Muller, 1908: 
101-102, pi. 14, figs 4-7, pi. 15, figs 1-5. 
Other species. B. aff. aculeata of Maddocks, 1969, B. 
sp. A (Cronin, 1983) [= Anchistrocheles sp. A Cronin, 
1983]. 
agement during various stages of the work. The 
Museum of Victoria granted access to Chap¬ 
man’s ostracod collection and the Geological 
Survey of Victoria provided borehole material 
Financial assistance from the Commonwealth 
Postgraduate Research Award Scheme and the 
University of Melbourne Postgraduate Writing- 
up Award Scheme is gratefully acknowledged 
REFERENCES 
Diagnosis. Carapace of moderate size for family, 
subtrapezoid in lateral outline and compressed 
in dorsal view. Posterior extremity with promi¬ 
nent terminal spine; anterior extremity gener¬ 
ally denticulate and sometimes with terminal 
spine. Carapace smooth or weakly punctate. 
Dorsal margin arched in LV, slightly concave in 
RV. Posterodorsal margin slightly convex in 
RV, more or less straight in LV. Anteroventral 
and posteroventral margins broadly convex in 
both valves. Ventral margin straight in RV, 
slightly concave in LV. Anterior extremity 
above mid-height and posterior extremity below 
mid-height in both valves. 
Remarks. The three species here assigned to 
Bythopussella were previously included in 
Anchistrocheles but they differ markedly from 
members of that genus in lateral outline, in the 
extent of the inner lamella, and in the usual pre¬ 
sence of a terminal posterior spine. Bythopus¬ 
sella resembles Pussella in that species of both 
genera may possess a terminal posterior spine. 
Bythopussella differs from Pussella and Dani- 
pussella in being less elongate. Bythopussella is 
easily distinguished from Bythotriangularia, 
which has a carapace that is subtriangular or 
oval carapace instead of subtrapezoidal, lacks a 
posterior terminal spine and is generally more 
inflated. 
The lateral outline of some Bythopussella spe¬ 
cies is perhaps reminiscent of various juvenile 
bairdiids, some of which also have a posterior 
terminal spine. Adults of Bythopussella differ 
from juvenile bairdiids, however, in the devel¬ 
opment of broad inner lamellae and in the over¬ 
all compression of the carapace. 
Bythopussella species appear to inhabit rela¬ 
tively deep marine realms. 
ACKNOWLEDGEMENTS 
I thank Drs G. A. Thomas, N. W. Archbold, K. 
G. McKenzie and I. Yassini for useful discus¬ 
sions and for reviewing early drafts of the manu¬ 
script. Dr A. Cundari is thanked for his encour¬ 
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