226 MESSRS. BRADY, PARKER, AND JONES 
Polymorphina (Guttulina) crassatina, Von Münster, 1838 (Fide Roemer), Neues Jahrb. für Min., J ahrg. 
1838, p. 385, pl. 3. fig. 30. 
P. (G.) spiceformis, Roemer, 1838, ibid. p. 386, pl. 3. fig. 31. 
Guttulina problema, Reuss, 1845. In Geinitz's Grundriss der Verstein. p. 669, pl. 24. fig. 83. 
G. austriaca, D'Orbigny, 1846, For. Foss. Vien. p. 223, pl. 12. figs. 23-25. 
G. problema, id. ibid. p. 224, pl. 12. figs. 26-28. 
Polymorphina uvula, Ehrenberg, 1854, Mikrogeologie, pl. 26. fig. 28. 
Strophoconus polymorphus (in part) , id. 1bid. pl. 27. figs. 23-28. 
S. auricula, id. ibid. pl. 20. $ 2. fig. 2. 
S. africanus, id. ibid. pl. 21. fig. 88. 
Polymorphina problema, Egger, 1857, Neues Jahrb. für Min., Jahrg. 1857, p. 287, pl. 10. figs. 23-25. 
P. uvula, id. ibid. p. 293, pl. 10. figs. 26-29. 
Guttulina rotundata, Reuss, 1864, Sitzungsb. Akad. Wissensch. vol. 1. p. 469, pl. 3. fig. 4. 
G. problema, id. ibid. p. 470, pl. 5. fig. 4. 
G. pusilla, Stache, 1865, Novara-Reise, vol. i. 2** Abtheil., Paläont. von Neu-Secland, p. 265, pl. 24. fig. 12. 
Polymorphina problema, Parker, Jones, & Brady, 1865, Ann. Nat. Hist. Ser. 3, vol. xvi. p. 187, pl. 2. 
fig. 50; iid. 1866, Monogr. Crag Foram. pl. 1. fig. 64; Reuss, 1867, Sitzungsb. Akad. Wissensch. 
vol. lv. p. 73; Karrer, 1868, Sitzungsb. Akad. Wissensch. vol. lviii. p. 172. 
Characters.—Shell oblong, ovate, irregular. Chambers numerous, much inflated, and 
separated by deep sutures; sometimes arranged triserially, but more ern crowded 
together irregularly; orifice round, radiate ; surface smooth. Length 7; to yọ inch. 
D'Orbigny's Model, represented in fig. 11, a, is a convenient subtype embracing a large 
group of Polymorphine having in common a somewhat acervuline mode of growth and 
but little adhesion or overlap amongst the segments. His later figures of the same 
species are by no means so characteristic, and are scarcely separable from .P. communis. 
This circumstance has led Prof. Reuss in a recent memoir to place together P. pro- 
blema, P. communis, and P. Austriaca—a conclusion in which we should entirely agree 
were the figures in the “ Vienna Basin" monograph our only guide. That the typical 
P. lactea inosculates with P. communis, and this again with P. problema, does not admit 
of doubt; but they none the less represent types round which a large number and variety 
of individuals may be conveniently arranged; and this is all that can be said for any 
single “species” of the genus. We have therefore preferred to accept the Modeles 
no. 61 and no. 62 as a basis of subdivision ; and our synonomy has been arranged ac- 
cordingly. 
The specimen described by Egger under the name P. wvula may be regarded as an 
irregularly grown example of this species; and Prof. Reuss's Guttulina rotundata, figured 
in his memoir “Zur Fauna des deutschen Oberoligocáns,” appears to be more nearly 
related to P. problema than to Bornemann's form. 
Guttulina Austriaca is somewhat longer proportionally than the type; and in | Polyb 
phina oblonga, D'Orb., and P. uvæformis, Reuss, we have varieties apparently interme- 
diate to P. problema and P. Soldanii (more nearly approaching the latter)—that is to say, 
somewhat Uvigerine in their general contour. | 
Distribution.—Tt is as a Tertiary fossil that Polymorphina problema is best known; 
indeed our notes of its occurrence in a living condition are not sufficient to enable us to 
