54 
Dr. G. J. Hinde on Rad iolaria from the 
Doryplegma gracile , sp. n. (PI. III. fig. 8.) 
The reticulate or spongy framework close, with small irre- 
gular apertures. Spine conical, tapering, about as long as the 
diameter of the shell. Smaller than the preceding form and 
with longer spine. Diameter of cortical shell T3, of medul- 
lary test * * * § 05; length of radial spine T5, basal thickness *015 
millim. 
Distribution. Hartree Hill, Peeblesshire. 
Genus Dorydictyum *, gen. nov. 
Sphaeroidea with tests of irregularly reticulate or spongy 
framework and a simple radial spine, with or without secon- 
dary spines. The structure of the test corresponds with that 
of Styptosphcera , Haeckel, and it differs from this genus by 
the addition of a radial spine. It is distinguished from 
Doryplegma by the absence of a medullary test. 
Dorydictyum simplex , sp. n. (PI. III. fig. 7.) 
The reticulate framework of the same character throughout, 
with very minute pores. Radial spine robust, styliform, 
nearly as long as the diameter of the shell. Occasional 
minute secondary spines. Diameter of the test *15; length 
of radial spine T2, basal thickness *022 millim. Rare. 
Distribution. Broughton Heights, Broughton, Peeblesshire. 
Genus Triposph^era f, gen. nov. 
Sphseroidea with an irregularly reticulate or spongy frame- 
work, a medullary shell, and three primary radial spines. 
Smaller secondary spines occasionally present. 
Forms with spherical shells and three prominent radial 
spines, but without a medullary shell, have been described by 
DunikowskiJ from the Liassic strata of Schafberg, and placed 
by him in the genus Spongechinus , Haeckel ; but in the 
1 Challenger ’ Report § one of them is regarded as discoidal 
and referred to the genus Spongotripus , H. Dr. Rust has 
also described rounded latticed forms with three prominent 
spines from Jurassic and Cretaceous strata; they were origi- 
nally placed in the new genus Triactoma (Palaeontogr. 
* hopv } a spear, SUtvov, network. 
•f rpinovs , a tripod, afpaipa, sphere. 
\ l)enkschr. d. k. Akad, der Wiss. Wien, Bd. xlv. p. 188, pi. y. 
figs. 54, 59. 
§ Pt. i. p, 581. 
