152 



SPIRIFER bisulcatus. 



TAB. CCCCXCIV— /g-5. 1 and 2. 



Spec. Char. Semicircular, gibbose, longitudinally 

 sulcatedj elevated in the middle, a deep furrow 

 on each side the elevation ; hinge line long, 

 straight ; beaks close. 



Jl5ut little wider than long. The furrows are about 30; 

 two of them near the middle are much deeper than the 

 rest, and the space between them is convex in some spe- 

 cimens, but flat in others (see fig. 2), the space between 

 the beaks is very long, flat, and has nearly parallel sides 

 in consequence of the edges of it upon the deeper valve 

 being reflected. 



From near Dublin. 



SPIRIFER distans. 



TAB. CCCCXCIV.— /g-. 3. 



Spec. Char. Semicircular, gibbose ; sides sulcated 

 longitudinally ; front elevated, elevation ex- 

 tending to the beaks, concave along the mid- 

 dle; beaks incurved, distant, the space between 

 them curved, triangular. 



Ten or twelve furrows occupy the sides of this shell, 

 the elevated part along the middle has no furrows ; the 

 length is about two-thirds of the width. 



Much resembling the last^ and also from Dublin. 



