58 Dr. G. J. Hinde on Itadiolaria from the 
Distribution . Abington, Lanarkshire ; Broughton, Hartree 
Hill, Kilbucho, Peeblesshire ; Moorfoots, Edinburghshire. 
Sphcerozoum patulum , sp. n. 
(PI. IV. fig. 12 ; woodcut, g ) hi) 
The spicules included under this term are geminate and 
cruciform. In the geminate forms there is a short central rod, 
from both ends of which two simple, subcylindrical, divergent 
rays are given off, approximately in the same plane (PI. IV. 
fig. 12 ; w r oodcut, g ). The rays are similar in the cruciform 
spicules, but the median rod is reduced to a slight central 
expansion (woodcut, h). Both kinds of spicules are present 
in recent species of the genus *, and they have been likewise 
noted from Jurassic strata. The geminate spicules differ from 
any known kind of sponge-spicules. 
The central rod of these spicules is from # 015 to *03 millim. 
in length, and the rays are from *03 to T3 millim. in length. 
Distribution . Broughton, Hartree Hill, Peeblesshire. 
Subclass NASSELLARIA, Ehrenberg. 
Order PLECTELLARIA, Haeckel. 
Suborder Plectoidea, Hseckel. 
Nassellaria with a rudimentary, originally tripodal, skele- 
ton, composed of radial spines arising from one common 
central point or central rod. (Chall. Rep. pt. ii. p. 898.) 
There are a few forms in the chert which appear to belong 
to the above suborder, but they cannot be included in any of 
the known genera referred thereto by Haeckel ; and it seems 
undesirable, since the specimens are rare and not perfect, to 
propose three new genera for them. In one specimen (wood- 
cut, i) there are five straight, nearly cylindrical rays proceeding 
from a minute rounded centre ; three of the rays are in one 
plane and one above and the other below this plane. On two 
of the rays are small spines or processes. The rays, when 
entire, are T5 millim. in length. In another specimen (wood- 
cut, k) there are five basal rays, with a stout ray rising from 
the centre. The rays are spinous, and there are traces of 
irregular tissue connecting them, as in the recent Plectanida 
(Chall. Rep. pt. ii. p. 919, pi. xcvii.). In the third specimen 
(woodcut, /), which is of unusual size, there are four basal 
rays radiating from a centre, from which also an upright ray 
spiings. The rays are cylindrical and smooth and bifurcate, 
* ‘ Challenger 9 Report, pt. i. pp. 40-45, pi. iv. 
