214 MESSRS. BRADY, PARKER, AND JONES 
? Rostrolina, sp., Von Schlicht, 1869, Foram. Septar. Pietzpuhl, no. 416, pl. 25. figs. 17, 18. 
Guttulina, sp., id. ibid. No. 491, pl. 32. fig. 21. 
Polymorphina lactea, var. amygdaloides, Reuss. 
(Compressed varieties, Wood-cuts a, b, c, d.) 
Polymorphina (Globulina) minuta, Roemer, 1838, Neues Jahrb. für Min., Jahrg. 1838, p. 386, pl. 3. 
. 95. 
P. (globulina) acuta, id. ibid. p. 386, pl. 3. fig. 36. 
Globulina minuta, Reuss, 1849, Denkschrift. d. mathem.-natur. Cl. k. Akad. Wissensch. vol. i. p. 877 j 
pl. 48. fig. 8. 
G. inequalis, id. ibid. p. 377, pl. 48. fig. 9. 
G. guttula, Reuss, 1851, Zeitsch. deutsch. geol. Gesell. vol. iii. p. 82, pl. 6. fig. 46. 
G. amygdaloides, id. ibid. p. 82, pl. 6. fig. 47. 
G. guttula, Bornemann, 1855, ibid. vol. vii. p. 344. 
G. amygdaloides, id. ibid. p. 344. 
Polymorphina deplanata, Reuss, 1855, —S k. Akad. Wissensch. Wien, vol. xviii. p. 246, pl. 6. 
fig. 67. t 
P. amygdaloides, id. ibid. p. 250, pl. fig. 84. 
P. subdilatata, Egger, 1857, Neues Jahrb. für Min., Jahrg. 1857, p. 286, pl. 13. figs. 30-33. 
Guttulina elongata, Karrer, 1861, Sitzungsb. k. Akad. Wissensch. vol. xliv. p. 24, pl. 2. fig. 3. 
Polymorphina (Guttulina) sororia, Reuss, 1862, Bulletin Acad. Roy. de Belgique, 2™° ser. vol. xv. p. 121, 
pl. 2. figs. 25-29. 
P. sororia, Reuss, 1863, Sitzungsb. k. Akad. Wissensch. vol. xliv. p. 57, pl. 7. figs. 72-74; id. 1866, 
Denkschr. d. mathem.-naturw. Cl. k. Akad. Wissensch. vol. xxv. p. 152; id. 1867, Sitzungsb. k. 
Akad. Wissensch. vol. lv. p. 73. 
P. inequalis, id. ibid. p. 72. 
P. depauperata, id. ibid. p. 73, pl. 3. fig. 9; Karrer, 1868, ibid. vol. lviii. p. 173. 
Globulina guttula, Gümbel, 1868, Abhandl. d. ii. Cl. k. Akad. Wissensch. vol. x. p. 645. 
? G. subalpina, id. ibid. p. 646, pl. 2. figs. 80, a. b. 
Characters.—Shell (typical) ovate, gibbous, slightly unsymmetrical ; anterior extremity 
acute; posterior obtuse, rounded. Chambers few, oblong, oblique, somewhat inflated. 
ere depressed. Surface smooth. Aperture simple, ee or oval, radiate. Length 
#5 to 3y inch. 
The earliest figure of a specimen belonging to the genus Polymorphina happens to be 
a fair representation of the particular form that may be regarded as a type of the group. 
Walker’s drawing, which we have reproduced on a somewhat larger scale than the ori- 
ginal, Pl. XXXIX. fig. 1a, though small and, in some respects, not very definite, has 
obviously been taken from a specimen very similar to that which has served as a basis 
for one of Prof. Williamson's figures, copied in fig. 15. 
The shell of P. lactea has normally but four or five visible hate: sufficiently ven- 
tricose to disturb the regularity of the general outline, the sutural lines being marked 
by depression or excavation. In its typical form the transverse section is nearly circular ; 
but this is a character open to variation. 
These peculiarities are matters of degree only ; and a * species " founded on them repre- 
sents an indefinite portion of a series of which the successive sections cannot be abso- 
lutely distinguished by the existence or non-existence of any single character. Such a 
