‘LOFTUSIA FROM BRITISH COLUMBIA. 71 
mental character of the test of Loftusia is apparent even under a 
low power, and it has a peculiar sparkling aspect. 
In form, the species bears a close resemblance to L. persica, espe- 
cially to the stouter variety represented in plate Ixxvii. fig. 3 
of Messrs. Carpenter and Brady’s memoir. I have not observed any 
specimens to assume a form quite so much elongated in proportion 
to the breadth as that given in figure 3 of the same plate. It is a 
regular oval, with circular cross section, the ends varying from ob- 
tusely rounded to bluntly spindle-shaped. The Marble-Cafion form, 
however, is very much smaller than L. persica, both in its external 
dimensions and proportionally in all its structures. By measure- 
ment of a number of specimens, the average length of the shorter 
axis appears to be from 19 to 20 hundredths of an inch, that of the 
longer axis about 30 hundredths; one specimen measuring as much 
as 57,(, in its lesser diameter has been found. Some may attain a 
10.0 
length of =3>, or even =4° of an inch; a ey long and nar- 
0) ) 
now aemnple reeeaureaie ne of an inch by yo of an inch, I have 
not been able to observe any regular furrowing of the outer surface 
of the test, though from the appearance in cross sections, it is pro- 
bable that a tendency to such marking exists in some specimens. 
Others must have become more or less rough and irregular in form, 
from the acervuline mode of growth frequently assumed in the larger 
examples. Many specimens are, like those of the Persian form, more 
or less oval or elliptical in the outline of the cross section. As, how- 
ever, IN some specimens many examples may be found in different 
stages of degradation towards absolute shapelessness, I believe, as 
Mr. Brady does of the Persian form*, that this is abnormal, and the 
result of changes after the death of the animal. In some cases, spe- 
cimens of irregular form are scattered among others: of normal ap- 
pearance, and seem to have decayed or collapsed more or less com- 
pletely before the consolidation of the sediment. In other layers, 
the whole rock has very evidently been compressed during metamor- 
phism, all the Foraminifera being flattened parallel to one plane. 
The structure of this form is in most respects strikingly similar 
to that of Loftusia persica, and, like it, extremely complicated. With- 
out Mr. Brady’s elaborate and lucid description of the former, it 
would have been a matter of no small difficulty to make out the plan 
of growth of this smaller species, which it is possible to examine in 
thin sections only. 
In describing the structure, the same terms made use of in the 
memoir already several times referred to will be employed. I would 
also call attention to the diagrammatic representation of the plan of 
the test of Loftusia on page 743 of the memoir. 
No central primordial chamber, or series of chambers, like that of 
Parkeria has been found. The nucleus of the test appears to be, as 
in L. persica, a loose-textured granulated mass, nearly circular in 
cross section. It has not been observed, however, to become so di- 
stinetly cancellated as appears to be the case in L. persica. 
In theory, this test may be said to consist, like that of the original 
* Op. cit. p. T42. 
