KAEAKOEAM STONES, OE SYEINGOSPHAlEIDiE. 15 
•fhe tubes bl .? ader mterradial series, with slightly larger, closer, and very bent tubes, 
radial and strain! t ^ SGrieS are wider apart than the othcrs ’ although their course is usually 
late at the si? lt ’ rp bey ° ften bend much here and there, are irregular, and are often genicu- 
lacrease i n Tbey . unite h J means of very small offshoots, and bifurcate, but rarely 
f°rm linear radial 'r SUdbdeidd y P resen t the aspect of a cone in the mass. They rather 
varicose, and ‘ cdos ? r mterradial series bend, unite, bifurcate, and are singularly gyrose, 
they resemble ar tbeir com ’ se in many places. They are often so close together that 
uiore or less r>‘ S ^hes, and then the section having cut across many, exhibits the 
Tbe tub U CL ai * n<ds * on m the tube-wall and the lumen. 
Thr T Usually 3oo inch in diameter, those of the interradial series being the 
In some ° U ; 0Ut tl,e number of tubes in the interradial series is very great. 
largest. 
In Some ■ + . . jjj jjj.izt.xLtiu.xcix ocuco is very great. 
P°re, and in b ° tS Cal ° ltc bas filled U P a vacant space which was evidently once a surface 
* v ) tAUCl XXl X 1 I ” v * xvx.eu orj V/J-UJO Cl p UI IClvC 
distal ly to tlie ne or two places the tubes end at one of these places. New tubes were formed 
direction. t!I SpaCe by tbe artddn S over of side ones, and the branches taking a radial 
^unifest" dijf U S ° me parts tbe radial tu1jes are smaller than in others, and then there is 
give off offs rr betweei1 1,iem a nd those of the adjoining interradial series, which branch 
The inwl! one side, and twist in a close and remarkable manner, 
very minute 61 SI>aCeS between tiie radial tubes are the largest, and those of the interradials are 
ra dial and Y + b ° ce . rdre °t the section a confused mass of convoluted tubes exists, and the 
stl> uctur a l ele eU ' ad * a * scides appear to start from it. The tubes are thin at the wall, and the 
At the ^ rantdar ’ molecular and thinly set, is minute in the extreme. 
ra dial series^ °* ^ body ever y granule with its circlet of pores is the outlet of a 
structure within ' space between the granules, pores included, represents the interradial 
Thf 
& eatest breadth of the spheroidal body is one and a half inch. 
SykingosphjEria pouosa, Duncan. Plate II, Pigs 3, 4. 
The b i & 
"ith minute h)w ob ^ a T ed y spheroidal in shape and symmetrical. The surface is covered 
Numerous and * IOUrided granules. The granules vary much in size, the pores are exceedingly 
giving a boi c |] Une T uall y distributed, and the space between many of them is in ridges, 
1 ''filiation is !j*' cida t c appearance, especially equatorially. No large amount of tube 
." Ul( le up 0 f tub 1S1 ^ e fm ^ be suidace ’ on the. contrary, it appears, except at the pores, to be 
! n tersp aces °P en mg directly with circular or oblique outlines, and of wide intertubular 
Ul ' (> gularity 0 f p . A ' bb . daidc calcite. Where there is much space between the pores, the 
We athered out ■ Y ( " dcde indicates the former existence of peripheral tubes which have 
converging upVYf, Wbere the granules show any structure, it is that of tubes on their sides, 
* l( ‘ pores are'' 3 ] 1 S and °P erdn S a t the top, and of tubes opening on the centre of the top. 
grounding. , );u g eaidy s P aces where tube-growth has not progressed equally with that of the 
"'h floor. b 1 S ' The sides of the pores present tubes passing radially, and tubes open on 
tub es which Se(ddons * under low powers, exhibit localised and more or less circular groups 
Belial that only Y neSI)01ld to S ra nules. In some the tubulation is reticulate, and in others, so 
e ( ' ll t ends of tubes are seen. There are spots where the reticulation is 
