104 
Testaceous lthizoj)ods from the 
[Monthly Microscopical 
Journal, Feb. 1, 1869. 
lY. — On some undescribed Testaceous Bkizopods from the North 
Atlantic Deposits. By G. C. Wallich, M.D., F.L.S. 
Amongst the deposits of wluch specimens have been obtained by 
the sounding machine, from great depths, in certain parts of the 
North Atlantic, I have occasionally met with some elegantly shaped 
minute siliceous- shelled organisms, the characters of which are 
sufficiently distinct to indicate that they do not belong to any of 
the commonly known and most largely distributed types of the 
Oceanic Khizopods. Owing to their comparative scarcity, and 
the difficulty of separating them from the mass of the material in 
which they occur, I am unable to state if any specimens reached 
the surface in a living condition. But, so far as I am aware, there 
is not any less indirect evidence for assuming that they live at the 
depths from which they have been obtained than that derivable 
from the circumstance of their not having been heretofore detected, 
at the surface, in those portions of the open ocean which have 
long since been carefully investigated by naturalists. Moreover, 
judging from certain peculiarities in the configuration of one of the 
varieties about to be noticed, it would rather seem probable that 
their natural abiding-place is at, or near, the surface ; and that, in 
common with the free-floating pelagic Diatoms and Protozoans 
EXPLANATION OF PLATE III. 
Fig. 1. — Shell of Cadium marinum, after Bailey. 
„ 2 & 3.— Test and Animal of Lagynis, after Schultze. 
„ 4.— Test of Euglypha alveolata, Bengal variety. 
5. — Shell of Cadium marinum, from the North Atlantic, with recurved neck. 
„ 6. — Shell of Cadium marinum, with straight neck. 
„ 7.— Shell of Cadium caudatum (nov. spec), showing septum and communi- 
cation between the body and neck, very analogous to that shown by 
me to be present in the fresh-water Difflugia septifera. 
„ 8.— Shell of the same without septum, meridional grooves or striation. 
„ 9.— Shell of the same, with the caudiform appendage and sarcode body rolled 
up into a spherical mass. 
„ 10. — Variety of the same, with expanded aperture. 
„ 11. — Small variety of C. manwwm, with straight neck. 
„ 12. — Small variety of C. caudatum. 
„*13. — More highly magnified view of anterior aperture of C. marinum. 
„*14. — Highly magnified aperture found in the posterior position of some speci- 
mens of C. marinum. 
„ 15.— Protocystis aurita (nov. gen.). 
„ 16. — The same, without the ear-like processes. 
„*17. — Highly enlarged fragment of shell of P. aurita, showing formation of 
ear-like processes — anterior aperture and shell structure. 
„ 18. — Protocystis lageniformis (nov. var.). 
„ 19. — Protocystis spinifera (nov. sp.). 
* Figs. 13, 14, and 17, prove from the lines of fracture that the appearance of 
strife and depressions is not due to apertures in the substance of the shell. 
