PLATE 6. 
PINNITE. LIMESTONE. 
FIG. 1, 2. 
CONCHYLIOLITHUS Pinnites (Jlabelliformis ) sub- 
flabellatus longitudinaliter sulcatus : sulcis aequalibus 
rectis : interstitiis rotundatis lasvibus. S. p. 
A petrified shell — ^The original a Pinna. Somewhat fan- 
shaped. Beaks pointed. Opposite extremity very broad 
and rounded. Surface sulcated in a longitudinal direction ; 
the sulci equal, and straight; the intervening spaces rounded 
and smooth. 
Rare. I have met with specimens near Buxton and 
Bakeivell, but none very perfect. Those exhibited in the 
annexed plate were found near Ashford. They constitute 
part of a mass of limestone, three or four times larger than 
the drawing. 
Fig. 1. The more perfect of the specimens. The beaked 
end broken. The surface divided by a diagonal fracture 
in the limestone. 
2. A smaller fragment. 
When these, and some other specimens of the same shell, 
first came under my examination, I considered them as the 
feraains of the great, rough, sulcated Pinna^ {Pinna nobilis 
