The shell is colorless, thimble-shaped, with a broadly rounded
posterior end. The body is cylindrical. The internal organs were not
observed. Membranelles 24 in number. Length 50µ; greatest diameter
40µ.


[Illustration: Fig. 47.--_Tintinnopsis beroidea_.]


Var. compressa Daday '87.

The posterior end of the shell is pointed, the lower third of the
shell is swollen, the upper third is uniform in diameter and without
oral inflation or depression. Nucleus not seen.

Length 70µ; greatest diameter 48µ.


Tintinnopsis davidoffi Daday. Fig. 48.

The shell is large, elongated, and provided with a considerable
spine. The chitin of the shell is covered with silicious particles of
diverse size. The internal structures were not observed.

Length of shell and spine 230µ; diameter of the oral aperture 54µ.


[Illustration: Fig. 48.--_Tintinnopsis davidoffi_.]