ON THE GENUS POLYMORPHINA. 243 
Notwithstanding the great difference that appears at first sight between Dr. Egger's 
specimens of Polymorphina tuberculata and those originally figured by D'Orbigny under 
the same name, there need be little difficulty in accepting them as representing the same 
species. A slight doubt may exist as to whether the former may not be as nearly related 
to P. spinosa ; but the two varieties probably inosculate in their extreme specimens, so that 
this is a circumstance of minor importance. In Pl. XLI. figs. 35, «-d, we have copied the 
drawings of both authors: & and b are from D'Orbigny ; c and d are after Egger. We have 
remarked that in some other Polymorphine the Bavarian specimens are larger and more 
stoutly grown, as a rule, than those of similar geological age from the Vienna Basin ; and 
in the case of the “ornamented” forms (e.g. P. spinosa) the former show a stronger 
development of the distinctive markings. The term “ tuberculata ” would scarcely sug- 
gest itself as applicable to the external condition of figs. c and d, viewed by itself; but if 
we suppose the exostoses to originate in tubercular shelly growths, increased in size until 
their margins have become merged into irregular ridges, it no longer conveys an anomaly. 
Intermediate specimens would probably demonstrate the correctness of this view; but we 
are altogether dependent on the authors above quoted for our knowledge of the species. 
Distribution.—Baden beds, Vienna Basin (D'Orbigny) ; Mairhof and Hausbach, Orten- 
burg, Lower Bavaria (Egger), and Kostej in the Banat (Karrer), all these being of Mio- 
cene age. Dr. Reuss notes its occurrence in the *' Minimus-Thon" (Gault) of North 
Germany and in the Crag of Antwerp. 
POLYMORPHINA SPINOSA, D'Orbigny, sp. (Plate XLII. figs. 36, a, b.) 
Globulina spinosa, D'Orbigny, 1846, For. Foss. Vien. p. 203, pl. 13. figs. 23, 24. 
Polymorphina (Globulina) spinosa, Egger, 1857, Neues Jahrb. fir Min., Jahrg. 1857, p. 292, pl. 14. 
figs. 9, 10. 
P. spinosa, Karrer, 1868, Sitz. Akad. Wissensch. vol. lviii. p. 173. 
Characters.—Shell oblong, ovate, or subspherical. Anterior extremity acute or rounded ; 
posterior obtuse. Surface studded with more or less closely set, stout, pointed spines. 
Aperture radiate. Length 35 to ys inch. 
. The Bavarian specimens of this species, figured by Dr. Egger, although of nearly the 
same geological age, are larger than those originally described by D'Orbigny, and have 
the characteristic superficial spiny processes developed to a much more striking extent. 
Our figures are copied from Dr. Egger’s illustrations of Bavarian Foraminifera. 
Polymorphina spinosa may be easily distinguished from allied forms, except in the rare 
cases in which the spines simulate the shorter outgrowths of P. tuberculata. 
Distribution.—1t is only known as a Miocene fossil—D'Orbigny's locality being the 
Nussdorf beds of the Vienna Basin; Egger's, Hausbach in Lower Bavaria; and Karrer's, 
Kostej in the Banat. 
PoLYMORPHINA HIRSUTA, spec. nov. (Plate XLII. fig. 37.) 
Characters.—Shell subspherical, gibbous, oval, or slightly compressed. Septa obscure. 
Surface beset with short, stout bristles. Length 4; inch. 
Amongst the simpler Foraminifera, the tendency to form superficial outgrowths of shell- 
VOL. XXVII. . 2E 
