567 
REPORT OX THE FORAMINIFERA. 
large terminal segment, — the series that is exposed on one face of the shell being covered 
on the other, and vice versct Thus, from whichever side the test is viewed, it presents 
four or five arcuate chambers, with their ends embraced by the broad final segment of 
the opposing series. The test is sometimes more or less compressed on three sides, 
but the same general arrangement of the segments is preserved. 
In point of distribution the species appears to be confined to the shores of the Pacific, 
and is best known from Australian specimens. It has been found in littoral sands from 
the neighbourhood of Melbourne, and in dredged material from Port Jackson and Sydney 
Heads, New South Wales ; from Curtis Strait, Queensland ; from Bass Strait, 38 fathoms ; 
from Torres Strait, 155 fathoms; aDd from Storm Bay, Tasmania. It has also been obtained 
off Ki Islands, 129 fathoms and 580 fathoms, and in Hong Kong Harbour, 7 fathoms. 
Some of the specimens figured b}- Peuss as Polymorphina problema , var. deltoidea, 
and Polymorphina anceps (Denkschr. d. k. Akad. Wiss. Wien, vol. xxv. pi. iv. figs. 8-11), 
and by Schlicht (Foram. Pietzpuhl, pi. xxxii. figs. 17-20), from the Septaria-clays of 
Germany, appear to me to be inseparable from this species. 
Polymorphina seguenzana, n. sp. (PI. LXXII. figs. 16, 17). 
Test elongate, fusiform, compressed on three sides ; broadest somewhat below the 
centre, tapering gradually towards the oral end, and somewhat more rapidly towards the 
opposite extremity, which finishes in a sharp point : segments few in number, only three 
visible externally, long, narrow, erect ; surface smooth, sutures marked by fine lines 
without external depressions. Length, T Vth inch (L6 mm.). 
The trifacial compression of the test, its acumiuate initial end, and the erect position 
of the segments, are sufficient to distinguish this species from its near allies. It has been 
named after Prof. Seguenza of Messina, to whom science is indebted for several important 
palseontological memoirs bearing more or less upon the Foraminifera. 
Polymorphina seguenzana is exceedingly rare, having only been observed in two 
localities, namely, — -off the Ki Islands, south-west of New Guinea, depth, 129 fathoms, and 
at Port Jackson, New South Wales, 2 to 10 fathoms. 
Polymorphina tliouini, d’Orbigny (PI. LXXII. fig. 18). 
Polymorphina tliouini , d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 265, No. 8. — Module, No. 23. 
„ „ Brady, Parker, and Jones, 1870, Trans. Linn. Soc. Lond., vol. xxvii. p. 232, 
pi. xl. fig. 17. 
This is an attenuated variety, with long, nearly erect, slightly inflated segments. The 
d’Orbignian model has fewer chambers than the specimens represented in fig. 18, and is 
even longer proportionately. 
