STILL FOUND IN A LIVING STATE. 371 
_ its shell is shagreened, and these minute projections correspond 
distinctly with the fine tubes and pores of the shell, and are therefore 
undoubtedly the retracted pseudopodia or cirrhi. 
J. A single joint of the body, detached by violently removing tae 
shell with too concentrated an acid. It corresponds to the contents 
of one chamber, side position, and with empty shells of Bacillarie 
_ in the interior. 
a to (. The space occupied by the nutritive canal. Between 
(3 and y is situated the ovarium, near the intestinal canal. 
y- The connecting canal of the members or sipho, in place of 
which in the first joint the mouth aperture is situated. 
6. A space on each side, in which other very transparent parts 
of the organism are probably situated, but which hitherto have not 
been seen. 
g- An animal with its shell, and an affixed petiolated ovarium. 
This state has been thrice observed on different individuals; each 
time, however, the sac had been already emptied, and exhibited 
large torn apertures both in front and behind. One had two aper- 
_ tures in front, and a third behind. In one were granules, which 
_ appeared like bad eggs. It appears therefore that in each such sac 
a number of eggs occur. The form, mode, and place of adhesion 
were alike in the three cases. I have also recently detected similar 
sacs in Geoponus. 
Fig. 2. Rotalia Stigma (not perforata), recent from the North Sea 
near Cuxhaven, in two specimens, magnified 300 times. 
_ The name BR. perforata, engraved on the plate instead of R. Stigma, 
is an error, which should also be corrected in pages 349 and 353 of the 
text. Both perforated and nearly allied fossil species have already been 
figured on pl. iv. to my Memoir on the Chalk of 1838, and may be 
easily compared. The apparent differences of the present and of the 
rmer two drawings are, I am convinced, not attributable to different 
ie characters. Other forms, occurring in the marls of Caltanisetta, 
are more and more closely related to the recent, and evidently belon 
the same species ; the fluctuation in the formation of which will be 
apparent from the two individuals here represented; and a comparison 
Of the three representations there given of different individuals of the 
n e perforata from Caltanisetta, Gravesend, and Denmark, exhibit 
ctuations in the formation. The large cells in connexion with 
minute apertures have principally guided me in determining the species. 
__ a. A larger specimen, seen from the left side, and has eight joints 
or chambers. 
6. A smaller one, from the same side, with only four joints. 
____¢. The same, from the right side. 
The ovarium surrounding the intestinal canal alone, it seems, colours 
all the cells, beginning with the second. 
Fig. 3. Rotalia globulosa, recent near Cuxhaven, magnified 290 
nes in diameter. 
_ a. Viewed from the right side. 
6. Viewed from the left side. 
he ovarium again appears to be the principal organ, covering the 
stinal canal, aud all the other inner parts, with its brown-yellow 
s, beginning with the second cell. 
