151 
SPIR1FER lineatus. 
TAB. CCCCXCIII.— figs, 1 and 2. 
Spec. Char. Gibbose, covered with numerous di- 
verging sharp striae ; front semicircular, ele- 
vated in the middle ; from the elevation of the 
front a convex band proceeds to the beak ; hinge 
line long and straight ; beaks rather distant. 
The width is nearly double the length ; where the sur- 
face is perfectly preserved, the elevated striae are found 
to be minutely granulated ; the beaks are curved and 
approach nearly together, the space between them is 
rounded, and has a large triangular foramen ; the hinge 
line does not extend quite the whole width of the shell. 
Found in the Dudley Limestone. Fig. 2 is from a spe- 
cimen collected by Charles Stokes, Esq. 
SPIRIFER attenuatus. 
TAB. CCCCXCIII. Jigs . 3 , 4 and 5. 
Spec. Char. Convex, covered with numerous linear 
furrows, which increase in number towards 
the margin ; front rounded, elevated in the 
middle, from each side of the elevation a deep 
furrow proceeds to the beak ; sides produced, 
pointed ; hinge line long, straight ; space be- 
tween the beaks flat, with nearly parallel 
edges. 
The furrows upon the surface of this shell form be- 
tween them thin branched ribs : in many specimens the 
elevated part of the front is not followed by a corre- 
sponding elevation along the surface, although the other 
valve is concave in that direction ; the width is nearly 
three times the length in some specimens, others are 
less attenuated laterally. 
Produced by the Black Limestone near Dublin. 
