532 
PROFESSOR W. C. WILLIAMSON ON THE ORGANIZATION 
Calcisplicer cp. The supposed Radiolarians of the Welsh Carboniferous Limestones. 
Fig. 67.- Calcisplicera fimbriata, seen as a transparent object by transmitted light. 
Fig. 6S. Calcisphcerct Sol, seen as a transparent object by transmitted light. 
Fig. 69. Calcisplicera hexcigonata, seen as a transparent object by transmitted light. 
Fig. 70. Calcisplicera Icevis, seen as a transparent object by reflected light. 
Figs. 71-78. Various modifications of C. sqnnosci, seen as opaque objects by reflected 
light. 
Fig. 79. Calcisplicera cancellata, seen as an opaque object by reflected light. 
Fig. SO. Calcisplicera spinosa (?) seen as an opaque object by reflected light. 
Fig. 81. Calcisplicera robusta, from the corniferous limestone of Kelly’s Island, 
U.S.A. 
AH the above objects are enlarged 112 diameters, except fig. 80, which is 
enlarged 180, and fig. 81 is magnified 33 diameters. 
Supplementary Observations. 
(Added August 12, 1879.) 
I have obtained some important additional information respecting some of the 
organisms described in the preceding memoir since its communication to the Society, 
especially in reference to the supposed Roxliolarians, hitherto known as Traquarice. 
I am indebted to Mr. Cash, of Halifax, for some valuable specimens from his 
cabinet, originally prepared by Mr. Binns. The most important are a series of sec¬ 
tions of a crushed Lepidostrobus in all of which Traquarice occur, under such conditions 
as leave no doubt that they are the macrospores of a Lycopodiaceous plant. The 
structure of a transverse section of the axis of this fruit is represented in fig. 82, 
enlarged 16 diameters. Its vascular centre, a, is a nearly solid cylinder of vessels, in 
the middle of which are what appear to be a very small number of cells representing 
the medulla. The entire cylinder has a diameter of '05. The vessels are uniform in 
size, except at the extreme periphery where they are very small, as is usual with the 
Lepidodendroid cones. Surrounding this vascular axis we have numerous small cellular 
cylinders, b, each one of which contained a foliar vascular bundle supplying the bracts 
or sporangiophores of the cone; the vessels composing these bundles have disappeared. 
The similar disappearance of the inner and middle cortical layers of the axis of the cone 
has left these foliar cylinders isolated. Both this isolation of the individual cylinders, 
the mode in which they are clustered round the vascular axis, and the disappearance of 
the vessels of each foliar bundle are features identical with what we see in nearly all 
