REPOET ON THE FORAMINIFERA. 
151 
him, M. Terquem, figure distinctly limbate specimens under the name of Spiroloculina 
clepressa ; but d’Orbigny’s model of the latter species has no sutural limbation, and appears to 
be the same as the Spiroloculina planulata of Lamarck. The illustrations presented in PI. 
IX. figs. 15-17 are taken from what appear to me good typical examples of the limbate form. 
A few specimens of somewhat thinner contour and more delicately made, shown in 
PI. X. figs. 1, 2, occur in one of the Challenger dredgings in shallow water, off the southern 
coast of Papua. On the strength of their distinctly limbate septal lines I have classed 
them provisionally as a variety of this species, notwithstanding their comparative tenuity 
and their flat instead of somewhat concave lateral surfaces. 
Spiroloculina limbata occurs in all the great oceans, as well as in the Mediterranean 
and the Red Sea. It is commonest in shallow water, but is tolerably frequent to a depth 
of 400 fathoms ; beyond that it becomes rare, and except at one Station off the north 
coast of Papua (1070 fathoms) it has not been met with at greater depth than 700 fathoms. 
It is found as a Tertiary fossil in the Septaria-clay of North German^" (Bornemann), 
in the Pliocene marls of Italy (Soldani, d’Orbigny) and Sicily (Jones and Parker), and in 
the Glacial Clays of Norway (M. Sars), and of the north-east of Ireland (Wright). 
Spiroloculina excavata, cl’Orbigny (PL IX. figs. 5, 6). 
Spiroloculina excavata, d’Orbigny, 1846, Eor. Foss. Vien., p. 271, pi. xvi. figs. 19-21. 
„ „ Brady, 1865, Nat. Hist. Trans. Northd. and Durham, vol. i. p. 93, pi. xii. 
fig. 1. 
„ „ Terquem, 1875, Anim. surla Plage de Dunkerque, p. 38, pi. v. fig. 17, a, b. 
This species may be briefly characterised as having thick edges and deeply sunk 
centre. The most “ excavated ” specimens take the somewhat elongate contour represented 
in the drawings, and have the final segment extending a little beyond the rest of the 
shell. Such forms must be sought chiefly in the shallow water surrounding the coral 
islands of the Pacific. D’Orbigny’s figure is taken from the broader variety, which, 
in the living condition, is not uncommon amongst the Miliolce of temperate latitudes. 
Spiroloculina excavata is very widely distributed, but it does not extend into the 
colder seas beyond the temperate zones, nor are the specimens usually very abundant. 
It is at home in shallow water, rarely exceeding 100 fathoms, but specimens have been 
found in one locality at a depth of 420 fathoms. 
D’Orbigny’s fossil specimens were from the Miocene beds of Baden in the Vienna 
Basin. 
Spiroloculina impressa, Terquem (PL X. figs. 3, 4). 
Spiroloculina impressa, Terquem, 1878, M6m. Soc. geol, Fr., s6r. 3, vol. i. p. 53, pi. x. fig. 8 
In his memoir on the Foraminifera and Ostracoda of the Upper Pliocene of the Island 
of Rhodes, M. Terquem figures two Spiroloculina, very much alike in their general 
features, with the names Spiroloculina grateloupi and Spirolocidina impressa [op. cit,, 
