176 
THE VOYAGE OF H.M.S. CHALLENGER. 
The model of Quinqueloculina ferussacii represents a narrow, thinnish, somewhat 
angular Miliola, with the prominent ridges of the chambers developed into distinct ribs. 
There are usually three or four such costae on each face of the shell, the most striking of 
which are those which run down the middle of the final segment on either side, and a 
shorter one on the central, or antepenultimate chamber, which forms a sort of raised 
median line. These are the typical characters of the species, as determined from the model, 
and though much allowance must be made for variability, they indicate with sufficient 
accuracy the features of a large proportion of the specimens met with. The final segment, 
though generally a good deal longer than the penultimate, and produced at the oral end, is 
seldom so attenuated as in the specimens figured in PI. CXIII., and the peripheral margin of 
the outer chambers, instead of being attenuated as shown in the figures, is often thickened 
and furnished with more or less distinct ribs, as drawn by Prof. Williamson (loc. cit.). 
The geographical distribution of Miliolina ferussacii is very wide. Messrs. Parker 
and Jones mention it as one of the species found off the Hunde Islands in Baffin’s Bay, 
it occurs sparingly on our own coast and on the shores of Belgium and France, amongst 
the Canary Islands and the West Indies. In the southern hemisphere its appearance 
has only been noted at two or three points on the coast of Australia, from one of which 
(Torres Strait, 155 fathoms) the figured specimen was obtained. 
Its geological range extends as far back as the Eocene of the neighbourhood of Paris 
(d’Orbigny). It is found in the Miocene beds of Vienna (d’Orbigny, Reuss), and in the 
Crag of the eastern counties of England (Jones, Parker, and Brady). 
Miliolina undosa, Karrer, sp. (PI. VI. figs. 6-8). 
Quinqueloculina undosa, Karrer, 1867, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lv. p. 361, pi. iii. fig. 3. 
This is a Quinqueloculine variety, somewhat of the “ ferussacii ” type, with the salient 
angles of the chambers developed into costae, but instead of being straight and regular as 
in Miliolina ferussacii, they are sinuate and somewhat variable in thickness. In the 
fossil specimens described by Dr. Karrer, the undulated costae constitute a very marked 
and peculiar feature, but in recent shells the prominent ridges of the segments take the 
form of thin sharp angles rather than actual ribs. 
In some of its characters the variety represented in fig. 8 approaches more nearly to 
Quinqueloculina longirostra, d’Orbigny (For. Foss. Vien., p. 291, pi. xiii. figs. 25-27), 
and Quinqueloculina lachesis, Karrer (Sitz. d. k. Ak. Wiss., vol. lvii. p. 146, pi. ii. fig. 4), 
but there can be little doubt, notwithstanding the elongated neck, that it belongs to the 
same species. Mr. Hollick has not been quite happy in his rendering of the end view 
(fig. 8, b), which, perhaps from the specimen having been mounted obliquely, appears too 
compact and rounded : the shell is in fact somewhat compressed, and has angular chamber- 
margins. 
The finest recent examples of Miliolina undosa which have come under my notice, 
