180 Mr. H. J. Carter on 



they are mucli more defined and uniform (fig, 6, a), but lose 

 this again towards the circumference, where the linear dispo- 

 sition of the " pits " (fig. 6, b) tends to indicate that they are 

 transverse sections of a columnar structure which on all 

 sides bends outwards towards the circumference. Tliis radia- 

 tion is more particularly shown by the surface of the section 

 through the line of union between the seventh and eighth 

 parts of the fossil in this direction, of which the eighth part 

 or crown is unfortunately absent, while the other parts when 

 all put together give the " subspherical " form mentioned. 



When theraounted microscopic slice from the middle is viewed 

 through a ^-inch focus the circular spaces or divisions are seen 

 to be united by intercommunicating extensions (fig. 7, b b) of 

 tlie more condensed brown material, which, being without the 

 foraminiferal detritus, and thus better seen, becomes resolved, 

 under a power of five hundred diameters, into minute brown 

 granules. I should also have mentioned, however, that in the 

 midst of the foraminiferal detritus there are tlie remains of a 

 fungoid matted structure, only extremely fine and minute, com- 

 posed of white, opaque, apparently solid, branched, interunited 

 and tortuous filaments, about l-3000th in. in diameter, which 

 thus also ought to have been inserted among the elements 

 represented in the illustration, fig. 8. Size of fossil, when all 

 the parts are put together, about 1^ in. in diameter, and, as 

 before stated, subspherical in shape, or like that oiixParkeria*. 



* I have also three other specimens from the Cambridge Greensand, of 

 the same nature as Millarella, in which this fungoid filamentous struc- 

 ture is more or less evident, viz. : — 1, about | in. in diameter, globular, 

 ■with uneven earthy surface, composed of white chalky substance charged 

 with the usual foraminiferous detritus and permeated by a meandering, 

 defined, tortuous structure of a yellowish tint, entirely made up of the 

 same kind of filament as that noticed in Millarella, forming altogether in 

 amount about half as much as the white chalky substance ; 2, another 

 specimen about the same size and similarly composed, but in which the 

 meandering development is not evident and the filamentous structure not 

 so plain, while the surface is regularly tuberculated with a brown material, 

 which appears to be nothing more than a condensed or hardened state of 

 the foraminiferal detritus of the interior, so that diiference in f ossiliza- 

 tion may have to be taken into account in these instances; and 3, a 

 specimen which forms the nucleus or support upon which a Parkerian 

 structure has been built. This consists of a slightly fusiform, conical, 

 solid cylinder, in composition like the last specimen mentioned, about 1^ 

 in. long and 9-24ths in. in its greatest diameter, conical at one end and 

 obtuse at the other, which appears to have been broken off from an 

 original attachment. Be this as it may, however, this cylindrical form 

 has been overgrown by a Parkerian development on all parts except the 

 extremities, viz. the conical and the obtuse ends, to the extent of half an 

 inch, 80 that until the spheroidal mass thus produced was cut through 

 the whole looked like a globular Parkeria. Hence it is interesting to find 



