Rhetic Foraminifera from Somerset. 323, 
form with those figured by Dr. Brady from the Carboniferous 
Limestone of England and Scotland. The specimens from 
the latter formation are somewhat smaller than those from 
the Rheetic beds. 
S. congesta occurs in bed no. 3 of the Rhetic series at 
Wedmore, common; bed no. 5, common. 
19. Stacheia triradiata, sp.n. (Pl. XII. figs. 3-5.) 
“ Asteracanthion,” Terquem and Berthelin, 1875, Mém. Soc. Géol. 
France, sér. 2, vol. x., Mém. no. 3, p. 103, pl. ix. figs. 1 a—e. 
Test free, consisting of three somewhat short and irregu- 
larly cylindrical arms, radiating nearly at right angles to 
one another; surface smooth or finely granular and of a pale 
brown colour. Interior having an irregular central cavity ; 
the tubular arms divided at intervals by transverse septa. 
Wall of test thick and with distinct labyrinthic structure ; 
texture finely arenaceous. Each arm terminates in a small 
orifice, which leads back into a larger cavity. Average 
diameter of test } inch (8°125 millim.). 
Amongst the specimens of ‘‘Psammosiphon”’ in the Vine 
collection at the Royal College of Science there is one un- 
doubted example of Stacheta triradiata collected from the 
Wenlock Shales, so that this form, as well as S. ampleaa, 
ranges back into the Silurian strata. 
S. triradiata was found at Wedmore in bed no. 5, frequent. 
20. Stacheia amplexa (Vine). (Pl. XII. figs. 6, 7.) 
Psammosiphon amplexus, Vine, 1882, Quart. Journ. Geol. Soe. 
vol, xxxviii. p. 391, pl. xv. fig. 8. 
Test free or attached, in the latter case having a flattened 
base. Irregularly subspherical in form, with a warty surface, 
caused by the numerous papillose terminations to the tubular 
system of the interior. Interior traversed by cylindrical 
tubes, which are disposed in a sinuous manner. Wall of 
test thick and with labyrinthic structure. The Rheetic 
specimens are of a pale brown colour, and the shell-texture 
is subarenaceous, consisting of a fine sand, mixed with coarser 
material and crystalline aggregates, cemented together by 
material which was formerly chitinous. Length about } inch 
(5 millim.). 
S. amplexa has been recorded by Vine under the name of 
Psammosiphon amplexus from the Wenlock Shales (the Coal- 
brookdale and the ‘Vickwood beds); and the same author 
notes it also from the Hairmyres shales of Carboniferous age 
23* 
