4 
RICHARD HOLLAND. 
(Schwed. Südpolar-Exp. 
Trochammitia cretacea^ n. sp. 
Plate II. Figs. 4 and 6. 
Test spiral, nautiloid, compressed, not excavated at the umbilicus. Peripheral 
edge rounded. Segments numerous — about eight or nine visible externally. Sut- 
ures slightly excavated. Exterior smooth. Apperture apparently crescentiform and 
situated on the face of the terminal chamber close to the margin of the previous 
convolution. Diameter about i mm. 
Trochammiua cretacea is nearly allied to T. triillissata, Brady ' but it is more 
compressed, is not excavated at the umbilicus and probably never had the grace 
and finish of the latter ver}^ beautiful species. The specimens of T. cretacea (three 
in number) are all rather badly preserved and the appearence of somewhat coarse 
sandgrains in the tests of the two specimens figured in Plate II is due to erosion of 
the original surface. The texture is really very finely arenaceous and the exterior 
was originally probably not only smooth but glossy. 
The geological range of the genus Trochammiua goes back to the Lias formation 
but the records are not very numerous. The Trochamminæ of Brady’S monograph 
on the Carboniferous and Permian Foraminifera“ would now be referred to the genus 
Ammodiscus. In recent seas the genus is cosmopolitan and representatives occur at 
all depths. T. trullissata and T. ringens the nearest allies to the present species 
are both essentially deepwater forms. 
III. The Foraminifera of the Pecten-conglomerate. 
As already stated the remarkable rock to which the name Pecten-conglomerate 
has been given is considered to be of Pliocene age, and the species of Foraminifera 
obtained from the rock do not conflict with this view. Altogether 304 specimens 
were secured from the material and of these no fewer than five-sixths belong to the 
single species Cassidulina crassa. The other genera represented are all to be referred 
to the porcellanous or the vitreous sections of the Foraminifera — there is no trace 
of an arenaceous form; and all the specimens belong to species already known. 
Speaking generally the specimens are rather poorly grown and seem to indicate 
starved or brackish water conditions. The state of preservation of the shells varies 
considerably. Some of the Cassidulince are quite fresh-looking and glossy — almost 
■ Brady, 1879, Quart. Journ. Micr. Sei., vol. XIX, N. S., p. 56 PI. V, figs. lo and il. Also Report 
Chall. 1884 p. 342., PI. XL. Figs. 13 — 16. 
“ Pal. Soc. 1876 Monogr. Carb. and Perm. Forain. Pp. 69 -81. 
