192 
THE VOYAGE OF H.M.S. CHALLENGER. 
Hauerina ornatissima, Karrer, sp. (PI. VII. figs. 15-22). 
Quinqueloculina ornatissima, Karrer, 1868, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lviii. p. 151, 
pi. iii. fig. 2. 
„ falcifera, Karrer, 1868, Sitzungsb. d. k. Ak. Wiss. Wien, p. 151, pi. iii. fig. 3. 
„ ornatissima, Brady, 1876, Quart. Journ. Micr. Sci., vol. xvi., N. S., p. 406. 
This singular and beautiful species is one of the fine series of Porcellanea discovered 
by Dr. Karrer in the Miocene beds of the Banat. It is a very variable form, often 
irregular, almost always dimorphous in the adult state, and otherwise presenting 
anomalous and debateable features. 
In its early stage the shell is distinctly Milioline (either Triloculine or Quin- 
queloculine) in the form and disposition of its segments, as shown in PI. VII. figs. 18, 19, 
and rare specimens retain the same mode of growth until they are of considerable size, 
possibly to maturity (fig. 17). But it is far more common for the later convolutions to be 
divided into three segments (figs. 15, 16), or, in other words, to assume the Hauerine 
condition. Examples are sometimes met with in which there is no definite segmentation 
of the outermost whorl, and the cavity remains undivided (fig. 20), showing an approach 
to the structure of Cornuspira. The Hauerine affinity of the species, however, is 
attested by the aperture, which in recent shells is almost invariably porous. The fossil 
specimens figured by Karrer are less irregular, and though the orifice is divided it 
still preserves to some extent the Milioline character. The complex surface-ornament, 
consisting of bold transverse crenulations crossed by numerous, delicate, longitudinal striae, 
imparts a peculiar and striking appearance to the shell, and renders it one most beautiful 
of all the porcellanous Foraminifera. 
Varieties like that figured by Karrer, loc. cit., as Quinqueloculina falcifera, are 
occasionally found in recent gatherings, but it is impossible to separate them from the 
present more typical species. 
Hauerina ornatissima has its home amongst the coral-sands of the tropics, and 
though occasionally met with at depths as great as 200 or even 400 fathoms, it is common 
only in shallow water. The Challenger specimens are chiefly from the shores of the 
islands of the Pacific, notably the Society Islands, the Fiji Islands, and some of the 
smaller groups off the coast of Papua; but it occurs also off Ascension Island, off 
Mauritius and elsewhere. 
As a fossil, its only recorded locality is the Miocene of Kostej in the Banat, as indicated 
in the memoir already referred to. 
Planispirina, Seguenza. 
Biloculina, pars, d’Orbigny [1846], Brady, Reuss, Karrer, Siddall. 
Planispirina, Seguenza [1879]. 
Nummolocidina, Steinmann [1881], 
Hauerina , pars, Brady [1881], 
