ON THE GENUS POLYMORPHINA. 221 
In his figures of Gutt. lanceolata Prof. Reuss gives a series of forms extending not 
only from the longer to the shorter extremes above described, but embracing a number 
of irregular specimens which connect the series with such varieties as G7. Leopolitana 
and P. rudis. 
Polymorphina lanceolata and P. Bio have tests more compactly built, and tend 
towards Bornemann's Guti. cylindrica (vide Plate XXXIX. fig. 5, b). Two of Dr. Egger’s 
* species," Globulina angusta and Polymorphina prelonga, seem to be transition-forms 
between the present group and P. compressa: both of them are proportionally very 
long; but they are rounded at the ends, and otherwise depart somewhat from the charac- 
ters set down to P. fusiformis. Dr. Gümbel's Guttulina jurassica is possibly an imma- 
ture shell: the figure given is small and too indefinite for positive diagnosis; but 
we should for many reasons be inclined to place it in company with the kindred 
early forms of Strickland and Schwager, above named. M. Terquem's figures and our 
references to them must be taken for what they are worth. 
Plate XX XIX. fig. 5, a, represents the elongate few-chambered form of P. fusiformis, 
copied from Prof. Reuss's figure of G4. porrecta; figs. 5, b and c, show the more compact 
and regular variety copied from the best of Dr. Bornemann's many figures of Guttulina 
cylindrica; the woodcut e represents the stouter section of the group, and is reproduced 
from the late Mr. Strickland's drawing of P. liassica. 
In one of his recent papers, Dr. Reuss has placed Gutt. cylindrica as a synonym of 
G. rotundata; and there is much to be said for such an arrangement; but a review of the 
entire series of figures given by Dr. Bornemann leads to the conviction that they find 
their closest allies amongst the feebler specimens constituting the present group, and 
the figures show much the same sort of range of variation in general form as that just 
alluded to. 
Distribution.—The references already made indicate what is known of the geological 
distribution of Polymorphina fusiformis. It is found in the Lower Lias of England, 
France, and Germany ; in the Chalk; in the Hils Clay of Hanover; in the Septaria-clay 
of Hermsdorf, Offenbach, Pietzpuhl, &e., and in various other Tertiary beds of Germany. 
It has also been recognized among the Tertiary Foraminifera of New Zealand. It does 
not appear to exist as a living species; at any rate we find no figures of recent specimens 
that conform precisely to the characters laid down. 
POLYMORPHINA CYLINDROIDES, Roemer. (Plate XXXIX. figs. 6, a, b, c.) 
Polymorphina cylindroides, Roemer 1838, Neues Jahrb. für Min., Jahrg. 1838, p. 385, pl. 3. fig. 26; 
Philippi, 1844, Beiträge zur Kenntniss d. Tertiárverst. d. nord-west. Deutsch. p. 41. 
Proroporus cylindroides, Reuss, 1845, in Geinitz's Grundriss d. Verstein. p. 678, pl. 24. fig. 80. 
Polymorphina cylindroides, Karsten, 1849, Verzeichn. d. Rostock. Verst. a. d. Sternberger Gestein, p. 8; 
Reuss, 1855, Sitzungsb. k. Akad. Wissensch. vol. xviii. p. 249, pl. 8. fig. 78. 
Polymorphina lactea, var. acuminata, Williamson, 1858, Rec. For. Gt. Br. p. 71, pl. 6. fig. 148. 
P. compressa (in part), Parker & Jones, 1864, Phil. Trans. vol. clv. p. 361, pl. 13. figs. 48 a,b. 
Guttulina, sp., Von Schlicht, 1869, Foram. Septar. Pietzpuhl, no. 471, pl. 31. figs. 5, 6. 
Characters.—Shell elongate, fusiform, more or less compressed. Anterior extremity 
262 
