164 Pelagian MoUusca collected on a [no. 2, new series. 
Fig. 7, Atlanta (magnified.) 
The small figures show the natural size. 
a. With the animal, exhibiting the bifid foot employed in swim- 
ming. 
h. The eye magnified. 
Genus Limacina. 
Shell subglobose, sinistrally spiral, umbilicate ; umhlicus mar- 
gined ; cperciilumt none. 
Fig. 8. Limacina ? (magnified) front and lateral view. 
PLATE X. 
N. B. — The large figures represent the shell magnified — the 
smaller ones the natural size. 
Genus Hyal^a. 
Shell globular, translucent ; dorsal plate rather flat, produced 
into a hood ; aperture contracted, with a slit on each side ; pos- 
terior extremity tridentate. 
Fig. 9. Hyalcea . 
Fig. 10. The same showing the animal with its alar appendages 
in a state of rest. 
Fig. 11. The same showing the appearance of the animal when 
in motion. 
Fig. 12. Hyalcea . 
Fig. 13. Hyalcea : Quite transparent, with rust-colored patch 
es ; animal purple. 
Fig. 14. Hyalcea : Shell compressed, animal purple. 
Fig. 15. Hyalcea . 
Fig. 16. Hyalcea : Shell with posterior extremity elongated, 
curved, aperture more expanded. 
Fig. 17. Hyalcea : Shell deeply grooved, and purplish. 
Fig. 18. Hyalcea : Shell globose, claret colored. 
Fig. 19. Hyalcea : Shell of a deep brown color. 
PLATE XI. 
Genus Cleodora. Shell pyramidal, 3 sided, striated trans- 
versely ; aperture simple ,triangular, with the angles produced, 
apex acute. 
Fig. 20, Cleodora : (magnified) shell triangular elongated, 
>Yedge shaped, pointed \ animal of a pale milky color. 
