MARINE PROTOZOA FROM WOODS HOLE. 
419 
pseudopodia make it difficult to identify with any phase in the life-history of Trichosphserium. I shall 
leave it here provisionally, with the hope that it may be found more abundantly another time. 
Genus GROMIA Dujardin ’35. 
(Dujardin 1835; M. Sehultze ’62; F. E. Sehultze ’74; Leidy ’77; Biitschli '83; Gruber ’84.) 
The form is ovoid or globular, and the body is covered by a tightly fitting, plastic, chitin shell, 
which, in turn, is covered by a fine layer of protoplasm. The flexibility of the shell makes the form 
variable as in the amoeboid types. The thickness of the shell is quite variable. The pseudopodial 
opening is single and terminal. The pseudopodia are very fine, reticulate, granular, and sharply 
pointed, and form a loose network outside of the shell opening. Nucleus single or multiple. Con- 
tractile vacuole is usually absent. Fresh and salt water. 
Gromia lagenoides Gruber ’84. Fig. 4. 
This species is not uncommon about Woods Hole, where it is found upon the branches of various 
types of algpe. The body is pyriform, with the shell opening at the larger end. The chitinous shell 
is hyaline and plastic to a slight extent, so that the body is capable of some change in shape. The 
shell is thin and turned inwards at the mouth-opening, forming a tube (seen in optical section in fig. 4) 
through which the protoplasm passes to the outside. The walls of this tube are thicker than the 
rest of the shell, and in optical section the effect is that of two hyaline bars extending into the body 
protoplasm. A thin layer of protoplasm surrounds the shell and fine, branching, pseudopodia are 
given off in every direction. The protoplasm becomes massed outside of the mouth-opening and from 
here a dense network of pseudopodia forms a trap for diatoms and smaller Protozoa. The nucleus is 
spherical and contains one or two large karyosomes. The protoplasm is densely and evenly granular, 
without regional differentiation. 1 have never observed an external layer of foreign particles, such as 
Gruber described in the original species. 
Length of shell 245/<; largest diameter 1 25/< . 
Genas 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 
