ON THE GENUS POLYMORPHINA. 235 
Guttulina incurva (Plate XL. figs. 19, a, b) has the same general characters, but is 
somewhat longer in proportion and less symmetrical, one side being straight or even 
slightly concave, the other convex. In G. fracta (Pl. XL. figs. 19, c, d, e) this peculiarity 
is present to an exaggerated extent, whilst in G. globosa and G. obtusa the whole setting- 
on of the segments is anomalous and irregular. Guttulina dimorpha, but for its 
obvious connexion with the others of the group, might have been placed amongst the 
Dimorphine ; but it is probably only a feeble example of P. rotundata, with two of its 
chambers uniserial Karrer’s Polymorphina tenera closely resembles the figures of the 
“incurved” varieties. The curious recent specimen figured in D'Orbigny's ‘ Cuba” 
monograph, under the name P. Rochefortiana, is possibly as nearly related to the present 
group as any; but no form exactly similar to it has been observed by subsequent writers. 
Of Herr von Schlicht’s Rostroline we have already spoken. 
Distribution.—W e are dependent on the German authors above quoted for our know- 
ledge of the distribution of Polymorphina rotundata. It appears to be a predominant 
form in the Septaria-clays both of Hermsdorf, near Berlin, and Pietzpuhl, near Magde- 
burg. The locality of Herr Karrer's specimens alluded to is the Miocene clay of Kostej 
in the Banat. 
PoLYMORPHINA Sozpantt, D'Orbigny. (Plate XL. fig. 20.) 
? Arethusa corymbosa, De Montfort, 1808, Conchyl. Systém. vol. i. p. 302, 76* genre. 
Polymorphina Soldanii, D'Orbigny, 1826, Ann. Sci. Nat. vol. vii. p. 265. no. 12; Soldani, 1789, Testa- 
ceographia, vol. ii. p. 99, pl. 107. fig. nn. 
Polymorphina oblonga, D'Orbigny, 1846, For. Foss. Vien. p. 233, pl. 12. figs. 29-31. 
P. uveformis, Reuss, 1855, Zeitschr. deutsch. geol. Gesell. vol. vii. p. 289, pl. 11. fig. 5. | 
Characters.—Shell elongate, subeylindrical. Chambers numerous, convex, arranged in 
a compaet indefinite spire, the visible portions of the external segments somewhat tri- 
angular. Orifice circular, or radiate. Surface smooth. Length zp inch or more. 
The drawing in the * Testaceographia, to which D'Orbigny gave the name Polymor- 
phina Soldanii, seems to represent a tolerably distinct varietal form—a compact, sub- 
cylindrical, spirally arranged shell, which might be mistaken for one of the smooth Uvi- 
gerine. De Montfort's figure is so rough and ill-drawn that it is recognized with diffi- 
culty as belonging to the same, notwithstanding evidence of its having been copied from 
Soldani's plate. 
Polymorphina oblonga, D'Orbigny, and P. uvæformis, Reuss, are almost identical in 
general characters with P. Soldanii; but both of them are figured with a central, erect 
aperture, whilst that of the orignal drawing is somewhat eccentric and oblique—a 
difference of slight importance; both have also slightly longer and more fusiform 
chambers. 
Distribution.—The Chalk of Mecklenburg and the Nussdorf beds of the Vienna 
Basin (Miocene) are the localities given by Reuss and D'Orbigny respectively for the 
specimens above alluded to. Soldani’s figure is from a recent specimen found in the rich 
shore-sand of the Adriatic, near Rimini. 
VOL. XXVII. 2 1 
