ON THE GENUS POLYMORPHINA. 219 
Distribution.—Although Polymorphina gutta has been noticed in the Hils Clay of Ger- 
many, a deposit of Neocomian age, it is best known as a Tertiary fossil. It is found in 
the various Tertiary clays of North Italy and Germany, in the Barton Beds (Isle of 
Wight), and is not uncommon in the Crag of Suffolk. We have no note of its occurrence 
except as a fossil. 
POLYMORPHINA ACUMINATA, D’Orbigny, sp. (Plate XXXIX. figs. 4, a, b.) 
Pyrulina acuminata, D'Orbigny, 1840, Mém. Soc. Géol. Fr. vol. iv. p. 43, pl. 4. figs. 18, 19; Reuss, 1845, 
in Geinitz's Grundriss der Verstein. p. 670, pl. 24, fig. 64; Jones, 1854, in Morris's Cat. Br. Fossils, 
2nd ed. p. 40. 
Strophoconus stiliger, Ehrenberg, 1854, Mikrogeologie, pl. 26. fig. 22. 
S. acanthopus, id. ibid. pl. 26. fig. 23. 
Atractolina, sp., Von Schlicht, 1869, Foram. Septar. Pietzpuhl, p. 70, no. 397, pl. 25. figs. 9, 10. 
Pyrulina, sp., id. ibid. no. 422, pl. 25. fig. 53. 
Characters.—Shell ovate-elongate, symmetrical, triserial; both anterior and posterior 
extremities acuminate; margin entire, septal lines not depressed, often indistinet. Ear- 
ler chambers small, and forming a short inverted cone; the two or three last-formed 
segments large, embracing, and erect. Surface smooth. Length 35 inch. 
The claims of this pretty little form to specific distinction are of similar value to 
those of P. gutta. Both have compact triserial shells, with no constriction along the 
septallines; both are circular in transverse section; and in both the upper portion of 
the shell tapers gently to a point: but whilst P. gutta has an obtuse, rounded base, the 
earlier chambers of P. acuminata are arranged in a short spire, resembling an inverted 
cone, the point of which forms the lower extremity of the shell. 
In some of its characters P. acuminata bears a resemblance to P. fusiformis ; but the 
latter has fewer chambers, they are more even in size and scarcely overlap; it is also 
a much larger shell, and not so compactly built. 
We have already stated our views on Herr von Schlicht’s genus Atractolina, two of 
the figures of which seem to pertain to the present species. His Pyrulina, numbered 
422, is not quite pointed, but may, from its general accordance with the characters 
above laid down, be looked upon as belonging to P. acuminata. 
Distribution.—D'Orbigny's specimens were obtained from the Chalk of Meudon, in 
France; and a few examples have been found in the Chalk-marl of Kent (Charing). 
The Tertiary clays of Northern Germany have also afforded specimens; still, although it 
is probable that P. acuminata might be found wherever P. gutta occurs, it is, so far as 
our present knowledge goes, a rare species, and, like its close ally, unknown in a recent 
condition. 
PoLYMORPHINA FUSIFORMIS, Roemer. (Plate XXXIX. figs. 5, a,b,c; and Woodcut e.) 
Polymorphina (Globulina) fusiformis, Roemer, 1838, Neues Jahrb. fiir Min., Jahrg. 1838, p. 386, pl. 3. 
fig. 37. 
P. liassica, Strickland, 1845, Quart. Journ. Geol. Soc. vol. ii. p. 30, fig. b. 
Globulina Leopolitana, Reuss, 1850, Haidinger's Abhandl. vol. iv. p. 44, pl. 5. fig. 11. 
VOL. XXVII. 26 
