ON THE GENUS POLYMORPHINA. 239 
PoLYMORPHINA AUSTRALIS, D'Orbigny, sp. (Plate XLI. figs. 27, a, b.) 
Globulina australis, D'Orbigny, 1839, Voyage dans Y Amér. Mérid. p. 60, pl. 1. figs. 1-4. 
Characters.—Shell ovate, inequilateral, somewhat compressed, slightly constricted at 
the septal lines. Anterior portion acuminate, smooth ; posterior rounded, striate longitu- 
dinally. Orifice circular, radiate. Length 7; inch. 
Judging from D'Orbigny's description and drawings, the minute, feebly developed, 
partially striate shell to which he has given the name Polymorphina australis may without 
inconsisteney be admitted under a distinct name. The surface-ornamentation is similar 
to that of P. pulchella and P. irregularis, but is confined to the earlier chambers. In the 
form and arrangement of the segments it differs considerably from either of the last-named 
varieties. 
Distribution.—We have never met with P. australis, and can only note the locality 
appended to the original description, viz. * littoral sand from the Bay of San Blas, 
Patagonia." 
POLYMORPHINA PULCHELLA, D'Orbigny, sp. (Pl XLI. figs. 28, a, b.) 
Guttulina pulchella, D'Orbigny, 1840, Foram. Cuba, p. 129, pl. 2. figs. 4—6. 
Characters.—Shell elongate, fusiform, somewhat compressed. Anterior end acute; pos- 
terior obtuse. Margin even; septal lines slightly excavated. Surface having an orna- 
mentation of numerous, regular, well defined, longitudinal striæ. Chambers few, much 
elongated, erect, thin, and overlapping. Length 7; inch. 
D'Orbigny's figures, from which our own are copied, represent a modification of the 
Polymorphine type exceedingly interesting in eonnexion with the morphology of the 
group. In general form Polymorphina pulchella most resembles P. Thouini; that is to 
say, it has long chambers, combined so as to form a narrow, fusiform, subeylindrical test, 
but possesses a distinctive mark in the parallel longitudinal strise which cover the shell. 
Both this species and the next in order, P. irregularis, owing to the peculiar setting-on 
of the chambers have a strong resemblance at first sight to some forms of the genus 
Bulimina. : 
Distribution.—The specimens described by D'Orbigny were found in shore-sand from 
the islands of Cuba and Martinique. As we have never met with the species, we can add 
nothing in respect to its distribution. 
POLYMORPHINA IRREGULARIS, D'Orbigny. (Plate XLL figs. 29 a, b.) 
Polymorphina irregularis, D'Orbigny, 1840, Foram. Cuba, p. 131, pl. 2. figs. 12, 13. 
Characters.—Shell oblong, inequilateral, compressed, excavated at the septal lines. 
Anterior portion subaeuminate; posterior obtuse and rounded. Surface traversed longi- 
tudinally by well marked parallel furrows. Chambers unequal, irregular, inflated. Aper- 
ture round, pouting. Length 35 inch. 
The irregular, almost uniserial, setting-on of the chambers, and the sulcate surface of 
