164 Pelagian Molkisca collected on a [no. S, 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. 



b. The eye magnified. 

 Genus Limacina. 



Shell subglobose, sinistrally spiral, umbilicate ; umhtUcus mar- 

 gined ; operculum, 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 Hyalcea. 



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 Cleodoba. Shell pyramidal, 3 sided, striated trans- 

 versely ; aperture simple ,triangular, with the angles produced, 

 apex acute.. 



Fig. 20. Cleodora : (magnified) shell triangular elongated, 



wedge shaped, pointed ; animal of a pale milky color. 



