240 MESSRS. BRADY, PARKER, AND JONES 
the whole test, may be regarded as the principal distinctive characters of this me 
West-Indian species. 
Such specimens as those figured remind us of the close affinity of the Poly 
to the Nodosarie. A very slight inequality in the development of the chambers of 
Nodosaria scalaris, for instance, might produce a shell undistinguishable from these, 
especially in the absence of a radiate aperture. Nevertheless they probably find their 
right place amongst the Polymorphine, and they sort well with some other anomalous 
varieties, like P. australis and P. pulchella. 
Distribution. — Our knowledge of the distribution of the variety is confined to the 
information supplied by M. D'Orbigny, who gives “the shores of Cuba, Jamaica, and 
Martinique " as = localities whence his specimens were derived,—in each case from 
littoral sand. 
POLYMORPHINA MYRISTIFORMIS, Williamson. (Plate XLI. figs. 30, a—c.) 
Polymorphina myristiformis, Wiliamson, 1858, Rec. For. Gt. Br. p. 73, pl. 6. figs. 156, 157; Brady, 
1864, Trans. Linn. Soc. vol. xxiv. p. 473; Alcock, 1865, Proc. Lit. & Phil. Soc. Manchester, vol. iv. 
p. 206. 
Characters.—Shell subspherical, consisting of few (two to four) visible segments. 
Septal lines obscure, scarcely depressed. Surface marked by numerous longitudinal, 
interrupted, translucent costs. Orifice surrounded by a corona of raised ais Shell 
finely foraminated. Length 2; inch. 
Polymorphina myristiformis is a well-known recent species, being found at all points 
on our own coast where the water is deep enough.. It is very rare in shallow water, but 
in forty fathoms or upwards becomes comparatively common. It is a pretty, bright little 
shell, not to be mistaken for any of its natural allies, but liable, at first sight, to be 
confused with the fine large specimens of Lagena sulcata found at similar depths. When 
the septation is obscured, as it often is by the thickening of the shell, the best diagnosis 
is afforded by the slightly gibbous and unsymmetrical contour of the test, and the radiate 
orifice. Our figure (Plate XLI, fig. 30, a), copied from Prof. Williamson’s, fairly repre- 
sents the species as usually found. Mr. Robertson, of Glasgow, has forwarded to us speci- 
mens, from deep water off Eddystone, in which the costæ are much more strongly. deve- 
loped (figs. 30, 5, c), but not otherwise differing from the normal form. Although the 
costz are usually interrupted, as shown in the figures, examples are oocasionaliy met 
with in which they are nearly continuous and regular. | 
Distribution. —P. myristiformis has probably a very wide distribution as a recent Fo- 
raminifer. It is much more limited in its range as a fossil; our "ds fossil ae 
are from the Barton beds (Lower Tertiary), Isle of Wight. 
POLYMORPHINA COSTATA, Egger. (Plate XLI. figs. 31, a, b). 
Polymorphina (Globulina) costata, Egger, 1857, Neues Jahrb. für Min., Jahrg. 1857, p- 291, ie 14. 
P. (Globulina) striata, 1d. ibid. p. 292, pl. 14. figs. 3, 4. 
P. nn 1868, Sitzungs. Akad. Wissen. an vol. lviii. p 173; Bunzel, 1869, Jahrb. k. k. 
geol. R nstalt, vol. for 1869, p. 203. 
