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Petrushevskaya 1971


Figure 5

The inner structure of the shell in some of the Nassellaria studied by Buetschli (according to Buetschli, 1882).
I, II) Lithomelissa spongiosa; III, IV) Eucyrtidium excellens; V, VI) Lithobotrys geminata; VII, VIII) Ceratospyris calvata; IX) Eucyrtidium biauritium.
a) anterior and
b) posterior halves of the sagittal ring;
c) transitional part between the lower and posterior parts of the ring;
e) bars dividing basal pores;
h) lateral bars extending from the anterior part of the ring.