BRACHIOPODA. 465 
Inhabits the Feejee Islands. 
The horizontal digitations of the upper valve fitting into the erect 
canine teeth of the lower valve, together with the denticles within, and 
the black, elevated cicatrix, may serve to identify this species. It grows 
in groups so firmly adherent and interlocked that it is impossible to 
separate the specimens; and the upper valve fits so deeply into the 
lower as to render it impossible to open them without fracture. It is 
a well-characterized species of a genus difficult, from its protean 
forms, to separate into species. Its solid and dense texture are also 
peculiar. 
Figure 575, group of shells; 575 a, interior of the valves. 
Crass BRACHIOPODA. 
Crania RaDIOSA (Gould ). 
T. suborbicularis, inequivalvis, crassiuscula, citrina, costulis radiantibus, 
divaricantibus et strits concentricis cancellata; valvd superiort con- 
vexd, apice acuto, post-mediano ; valva inferiort planulata, concentricé 
laminosa et interdum versus peripheriam radiatim costulata, fissura 
minutd perforata: intus crista acuta, in valva inferiort apophysin 
furcatum gerente, bipartita ; cicatricibus icrassatis ; marginibus 
cilatis. 
SHELL small, rounded, rather thick, of a dull citron-yellow colour, 
inequivalve, the upper valve cancellate with concentric ridges and 
fine, rounded, radiating ribs, many of which subdivide near the 
margin; the apex is at the posterior third, acute and distinct; lower 
valve nearly flat, or even concave, according to the form of the object 
to which it adheres; rudely laminate concentrically, or sometimes with 
ribs near the margin, as on the upper valve; its central portion is 
radiately corrugated, so as to indicate the place of the apex; below 
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