Protozoa. The nucleus is spherical and contains one or two large
karyosomes. The protoplasm is densely and evenly granular, without
regional differentiation. I have never observed an external layer of
foreign particles, such as Gruber described in the original species.

Length of shell 245µ; largest diameter 125µ.


[Illustration: Fig. 4.--_Gromia lagenoides_.]


Genus TRUNCATULINA D'Orbigny.

A group of extremely variable foraminifera in which the shell is
rotaline; i. e., involute on the lower side and revolute on the upper
(Brady). The shell is calcareous and coarsely porous in older forms.
The characters are very inconstant, and Brady gives up the attempt to
distinguish the group by precise and constant characters.


Truncatulina lobatula Walker & Jacob.

Synonyms: See Brady '84 for a long list.

"It is impossible to define by any precise characters the
morphological range of the present species. Its variations are
infinite." (Brady, p. 660.)

This very common form, which occurs in all latitudes, was found
frequently among the algæ at Woods Hole. Its characters are so