322 Mr. F. Chapman on 
the best represented species, in point of numbers, in the 
Rhetic washings; and this form appears to have flourished 
on the sea-bottom, spreading horizontally and growing so 
numerously as to make quite a separation, band at frequent 
intervals in the clay deposits. 
There are, however, a few examples of Stacheia from the 
Rheetic beds which were without donbt attached forms ; and 
this feature is especially characteristic of S. cuspidata and 
S. intermedia. 
It will also be seen from the reference given above that the 
genus is represented in the Lias by fossils which have been 
referred to parts of Echinodermata. 
17. Stacheia intermedia, sp. n. (Pl. XI. fig. 25.) 
Test normally attached or sometimes free, irregularly 
cylindrical, and often turned outwardly at one end, thus 
forming a base of attachment. Subdivided internally in an 
irregular manner; with a terminal aperture, and also some 
other orifices of an irregularly stellate outline opening out 
upon the surface of the test. ‘Texture subarenaceous. Wall 
ot test of considerable thickness and with a finely labyrinthic 
structure. Colour pale brown. Length about } inch (6:25 
millim.). 
S. intermedia may be an irregularly cylindrical modifica- 
tion of the flat wild-growing form S. dispansa; but the 
apparently attached mode of growth of the former organism 
seems to justify its separation under a distinct specific name. 
It occurs in bed no. 3 of the Rhetic at Wedmore, very 
rare ; bed no. 5, frequent. 
18. Stachera congesta, Brady. (Pl. XII. figs. 1, 2.) 
Stacheia congesta, Brady, 1876, Monogr. Carb. and Perm. Foram. (Pal. 
Soc.) p. 117, pl. ix. figs. 1-5. 
Characters (after Brady, emended).—Test elongate, sub- 
cylindrical, rounded or fusiform ; either adherent, clustering 
around foreign bodies, or free. Chambers very numerous, 
irregular in shape, closely packed, confused in arrangement ; 
the boundary-walls of those composing the superficial layer 
sometimes indicated by the areolation of portions of the 
exterior of the test. Surface otherwise granular or nearly 
smooth. Apertures at the extremities of the fusiform 
varieties or disposed over the surface in an irregular manner. 
Length of the Rheetic specimens about +45 inch (2°5 millim.). 
Many examples from Wedmore are exactly comparable in 
