
656 WHAT IS BATHYBIUS ? 
lithus. The Discolithi he describes as “oval discoidal 
bodies, with a thick strongly refracting rim, and a thinner 
central portion, the greater part of which is occupied by a 
slightly opaque, as it were, cloud-patch. The contour of 
this patch corresponds with that of the inner edge of the 
rim, from which it is separated by a transparent zone. In 
general the Discoliths are slightly convex on one side, 
slighty concave on the other, and the rim is raised into a 
prominent ridge on the more convex side.”* These objects 
usually range from ! to şəy of an inch in their longest 
diameter. 
The Cyatholiths are like minute shirt-studs. They are 
stated to have “an oval contour, convex upon one face, and 
flat or concave upon the other. Left to themselves, they lie 
upon one or other of these faces, and in that aspect appear 
to be composed of two concentric zones surrounding a cen- 
tral corpuscule.” “A lateral view of any of these bodies 
shows that it is by no means the concentrically laminated 
concretion it at first appears to be, but that it has a very sin- 
gular and, so far as I know, unique structure. Supposing 
it to rest upon its lower surface, it consists of a lower plate, 
shaped like a deep saucer or watchglass; of an upper plate, 
which is sometimes flat, sometimes more or less watchglass- 
shaped; of the oval, thick-walled, flattened corpuscule, 
which connects the centres of these two plates; and of an 
intermediate substance, which is closely connected with the 
under surface of the upper plate, or more or less fills up 
the interval between the two plates, and often has a coarsely 
granular margin. The upper plate always has a less diam- 
eter than the lower, and is not wider than the intermediate 
substance. t" These Cyatholithi are further stated to vary 
in size from sys; to sss of an inch in diameter. The Cocco- 
heres are described by the same distinguished observer as 


y IEEE DO Kimi Pepepe i» ibo Jorik Atlantic Ocean, Quarterly 
Journal of of Microscopical Science, Oct., 1868 
bid. p. 207. 

